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1
Smith, N. J. "The age and structural setting of limestones and basalts on the Main Ring Fault in southeast Rhum." Geological Magazine 122, no. 5 (September 1985): 439–45. http://dx.doi.org/10.1017/s0016756800035354.
Повний текст джерелаАнотація:
AbstractIn southeast Rhum, a Mesozoic/Tertiary sequence is preserved as a fault-bounded and rotated wedge. This is juxtaposed between Precambrian rocks (Torridonian sediments and Lewisian gneiss) and caught up in the complex structure of the Tertiary Main Ring Fault (MRF), which shows three distinct phases of movement. The Mesozoic rocks comprise fossiliferous limestone, sandstone and shale, which show differing degrees of thermal metamorphism depending on their relationships to the Layered Complex. On the basis of faunal and lithological evidence the Mesozoic sediments have been correlated with the Lower Liassic Broadford Beds. The Rhum sediments are overlain by sheared Tertiary basalts, the contact between them probably representing the original landscape unconformity. The presence of these younger strata caught up along the MRF provides crucial evidence for a major phase of central subsidence in the early history of the Rhum Tertiary volcanic centre.
2
Guy-Ohlson, Dorothy, Bengt Lindqvist, and Erik Norling. "Reworked Carboniferous spores in Swedish Mesozoic sediments." Geologiska Föreningen i Stockholm Förhandlingar 109, no. 4 (December 15, 1987): 295–306. http://dx.doi.org/10.1080/11035898709453093.
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Šamajová, Lenka, Jozef Hók, Tamás Csibri, Miroslav Bielik, František Teťák, Bibiana Brixová, Ľubomír Sliva, and Branislav Šály. "Geophysical and geological interpretation of the Vienna Basin pre-Neogene basement (Slovak part of the Vienna Basin)." Geologica Carpathica 70, no. 5 (October 1, 2019): 418–31. http://dx.doi.org/10.2478/geoca-2019-0024.
Повний текст джерелаАнотація:
Abstract The Vienna Basin is situated at the contact of the Bohemian Massif, Western Carpathians, and Eastern Alps. Deep borehole data and an existing magnetotelluric profile were used in density modelling of the pre-Neogene basement in the Slovak part of the Vienna Basin. Density modelling was carried out along a profile oriented in a NW–SE direction, across the expected contacts of the main geological structures. From bottom to top, four structural floors have been defined. Bohemian Massif crystalline basement with the autochthonous Mesozoic sedimentary cover sequence. The accretionary sedimentary wedge of the Flysch Belt above the Bohemian Massif rocks sequences. The Mesozoic sediments considered to be part of the Carpathian Klippen Belt together with Mesozoic cover nappes of Alpine and Carpathian provenance are thrust over the Flysch Belt creating the third structural floor. The Neogene sediments form the highest structural floor overlying tectonic contacts of the Flysch sediments and Klippen Belt as well as the Klippen Belt and the Alpine/Carpathians nappe structures.
4
Alcalá-García, F. J., M. Martín-Martín, and A. López-Galindo. "Clay mineralogy of the Tertiary sediments in the Internal Subbetic of Málaga Province, S Spain: implications for geodynamic evolution." Clay Minerals 36, no. 4 (December 2001): 615–20. http://dx.doi.org/10.1180/0009855013640013.
Повний текст джерелаАнотація:
AbstractThe clay mineralogy of a set of Tertiary marine sediments from the Internal Subbetic of the Betic External Zone was examined. Two types of sedimentary environment were distinguished: a platform environment consisting of limestones, marls, organogenic limestones, conglomerates and silexites distributed heterogeneously in time and space; and deep environments, where the sedimentation consisted of marls, marly limestones, marly clays and silexites, with no sedimentary gap. A third group of sediments studied belongs to the Águila Complex, with mineralogical and stratigraphic characteristics very similar to the platform sediments. This third type of sediment is found in the sediments of the Campo de Gibraltar Complex as large, disperse blocks resulting from tectonic activity. A very similar mineral association was observed in all three domains, consisting of smectite, illite, mixed-layer I-S, kaolinite and lesser amounts of palygorskite and chlorite. Materials mainly derive from the erosion of Mesozoic sediments, and sedimentation was controlled by the compressive tectonics of the region.
5
Sarjeant, W. A. S., and R. A. Thulborn. "Probable marsupial footprints from the Cretaceous sediments of British Columbia." Canadian Journal of Earth Sciences 23, no. 8 (August 1, 1986): 1223–27. http://dx.doi.org/10.1139/e86-118.
Повний текст джерелаАнотація:
Probable marsupial footprints, exhibiting syndactyly of digits II and III of the pes, are described and placed into a new ichnogenus and species, Duquettichnus kooli. The type specimen is from the Cretaceous (late Aptian to early Albian) sediments of the Peace River canyon near Hudson Hope, British Columbia. This constitutes the first evidence for syndactyly among Mesozoic mammals, whose postcranial skeletons are very poorly known. It may well also constitute the earliest evidence for the presence of marsupials in Mesozoic North America.
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Shevchuk, Olena, and Kateryna Ivanchenko. "Acritarchs of the Mesozoic of Ukraine." Visnyk of V.N. Karazin Kharkiv National University, series Geology. Geography. Ecology, no. 55 (December 1, 2021): 107–16. http://dx.doi.org/10.26565/2410-7360-2021-55-08.
Повний текст джерелаАнотація:
Introduction. Acritarchs are one of the orthostratigraphic groups of microfossils that are widely used in Proterozoic and Paleozoic biostratigraphy. In the Mesozoic period there is a decrease in this group, and this is due to certain reasons. Formulation of the problem. Acritarchs are studied by palynologists from samples of Mesozoic sediments in combination with other representatives of organic bone microplankton, primarily with dinocysts. In the practice of Ukrainian micropaleontologists, the role of such a group as acritarchs, which may be unique in paleoecological reconstructions of the environment, is underestimated. History of the study of acritarchs. None of the researchers studied the group of acritarchs in the Mesozoic deposits of Ukraine. In scientific works it was noted only about the presence of these forms in the description of palynological complexes of Jurassic, Cretaceous and other times. Brief description of the group. Acritarchs are unicellular, non-colonial, organic microfossils. Formulation of the purpose of the article. The aim of the study was to focus on such a little-studied group for the Mesozoic as acritars and to prove its role and significance for stratigraphic and paleoecological constructions. Materials and methods. The research material was samples of rocks of the Middle, Upper Jurassic and Cretaceous deposits, selected separately from 93 sections, but from all major tectonic structures of Ukraine: Peninsky zone of the Carpathians, Volyn-Podolsk plate, western and eastern slopes of the Ukrainian Shield, Priazovsky array of the Ukrainian shield, Dnieper-Donetsk basin, Donbas, South Ukrainian monocline (Black Sea basin), Crimea, North-Azov depression and Azov shaft (Ukrainian part of the Sea of Azov). Presentation of the main material of the study. Acritarchs Jurassic and Cretaceous belong to 10 genera, including 11 species. The most common species found in both Jurassic and Cretaceous sediments of Ukraine are acritarchs Micrhystridium fragile and Fromea sp. Jurassic complexes are slightly richer than chalk in terms of percentage and are represented mainly by Micrhystridium spp., Micrhystridium flagile, M. longum, Veryhachium brevitrispinum, Wilsonastrum sp., Baltisphaeridium sp. Cretaceous: Micrhystridium spp., Micrhystridium fragile, M. longum, Baltisphaeridium breviciliatum, B. aff. capillatum, B. annelieae, B. accinctum, Acanthodiacrodium sp., Solisphaeridium inaffectum, Comasphaeridium sp., Comasphaeridium aff. brachyspinosum, Veryhachium spp., Veryhachium singulare, Leiofusa stoumonensis, Fromea sp., Ascostomocystis sp. The article presents photo tables of images of Jurassic and Cretaceous acritarchs. Conclusions. For the first time in Ukraine, acritarchs were found in samples from Jurassic and Cretaceous sediments and attention was focused on such a little-studied group for the Mesozoic. Their certain role and significance for stratigraphic and paleoecological constructions are proved, their species composition and vertical distribution in sections of Mesozoic sediments are studied. The regularities of the distribution of acritarchs in the same age layers are established. Analyzing the Jurassic and Cretaceous microfossils studied from Mesozoic sediments from 93 sections of different regions of Ukraine, we can say that the trend of disappearance of acritarchs during the Mesozoic is weakly observed. Jurassic forms of acritarchs are up to 5% in the complex, Cretaceous - up to 4%. The next stage of work should be the study of acritarch Jurassic and Cretaceous deposits of all regions of Ukraine for the purposes of the overall picture of the reproduction of paleoecological conditions in Ukraine during the Jurassic and Cretaceous period.
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Fakhruddin, Rakhmat, Taufi k. Ramli, and Hanif Mersil Saleh. "WELL AND OUTCROP CORRELATION IN THE EASTERN PART OF AKIMEUGAH BASIN, PAPUA: MESOZOIC PLAY POTENTIAL." Scientific Contributions Oil and Gas 41, no. 2 (June 29, 2020): 75–87. http://dx.doi.org/10.29017/scog.41.2.336.
Повний текст джерелаАнотація:
Mesozoic sediments are the main objective for hydrocarbon exploration in the eastern part of Akimeugah Basin, Papua. However, little information is currently available on paleogeography and subsurface distribution of the Mesozoic rock unit. This study analyzed Mesozoic rock unit from outcrops at Wamena and surrounding area to wells data in the eastern part of Akimeugah Basin, Papua. Outcrop and well correlation was made to interpret paleogeography of Mesozoic unit. This study was using existin 2D seismic and passive seismic tomography data to determine the distribution of Mesozoic rock unit in the subsurface and its hydrocarbon potential. The Mesozoic rock unit in the eastern part of Akimeugah Basin is divided into four formations based on their lithological characteristic. Respectively from old to young, Kopai, Woniwogi, Piniya and Ekmai Formation. The depositional environment of Mesozoic rock unit in the southern part of the study area is shore/tidal to shelf and basin fl oor in the northern part. Three Mesozoic potential plays in the studied area are divided into 1) Central Range Mountains thrust-fold belt play, 2) Akimeugah low land thrust-fold belt play and 3) Tanah Merah pinch-out play. The results presented in this paper are expected to be a guide for further hydrocarbon exploration in the study area. Mesozoic sediments are the main objective for hydrocarbon exploration in the eastern part of Akimeugah Basin, Papua. However, little information is currently available on paleogeography and subsurface distribution of the Mesozoic rock unit. This study analyzed Mesozoic rock unit from outcropsat Wamena and surrounding area to wells data in the eastern part of Akimeugah Basin, Papua. Outcrop and well correlation was made to interpret paleogeography of Mesozoic unit. This study was using existing 2D seismic and passive seismic tomography data to determine the distribution of Mesozoic rock unit in the subsurface and its hydrocarbon potential. The Mesozoic rock unit in the eastern part of Akimeugah Basin is divided into four formations based on their lithological characteristic. Respectively from old to young, Kopai, Woniwogi, Piniya and Ekmai Formation. The depositional environment of Mesozoic rock unit in the southern part of the study area is shore/tidal to shelf and basin fl oor in the northern part. Three Mesozoic potential plays in the studied area are divided into 1) Central Range Mountains thrust-fold belt
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Milnes, AR, RP Bourman, and KH Northcote. "Field relationships of ferricretes and weathered zones in southern South Australia: a contribution to 'laterite' studies in Australia." Soil Research 23, no. 4 (1985): 441. http://dx.doi.org/10.1071/sr9850441.
Повний текст джерелаАнотація:
Terrestrial landscapes have existed in parts of southern South Australia since the Carboniferous to Permian Gondwanaland glaciation. Widespread weathered zones and ferricrete horizons and crusts on present highland surfaces in the region have been ascribed by various workers to Mesozoic or early Tertiary weathering phases. A critical examination of field relationships, however, points instead to complex reworking and continuous weathering of relic landscapes since early Mesozoic times, leading to the intricate patterns of sediments and soils forming the present regolith. Ferricrete crusts sporadically distributed on the highland surfaces are interpreted dominantly as remnants of iron-impregnated sediments of ancient valleys or depressions. The great but variable thickness of kaolinized bedrock beneath the highland surfaces, regarded by other workers as the mottled and pallid zones of a 'laterite' profile, is the integrated product of leaching and weathering throughout the Mesozoic and Cainozoic and cannot be assigned to separate and distinct climatic events. The use of weathered landsurfaces and ferricretes as morphostratigraphic markers in such landscapes is questionable.
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Caracciolo, L., S. Andò, P. Vermeesch, E. Garzanti, R. McCabe, M. Barbarano, C. Paleari, M. Rittner, and T. Pearce. "A multidisciplinary approach for the quantitative provenance analysis of siltstone: Mesozoic Mandawa Basin, southeastern Tanzania." Geological Society, London, Special Publications 484, no. 1 (February 27, 2019): 275–93. http://dx.doi.org/10.1144/sp484-2018-136.
Повний текст джерелаАнотація:
AbstractThis paper shows how heavy minerals and single-grain varietal studies can be conducted on silt (representing c. 50% of world's sediments) sediments to obtain quantitative data as efficiently as for sand-sized sediments. The analytical workflows include heavy mineral separation using a wide grain-size window (15–355 μ) analysed through integrated optical analysis, Raman spectroscopy, QEMSCAN microscopy and U–Pb dating of detrital zircon. Upper Jurassic–Cretaceous silt-sized sediments from the Mandawa Basin of central-southern Tanzania have been selected for the scope of this research. Raman-aided heavy mineral analysis reveals garnet and apatite to be the most common minerals together with durable zircon, tourmaline and subordinate rutile. Accessory but diagnostic phases are titanite, staurolite, epidote and monazite. Etch pits on garnet and cockscomb features on staurolite document the significant effect of diagenesis on the pristine heavy mineral assemblage. Multivariate statistical analysis highlights a close association among durable minerals (zircon, tourmaline and rutile, ZTR) while garnet and apatite plot alone reflecting independence between the three groups of variables with garnet increasing in Jurassic samples. Raman data for garnet end-member analysis document different associations between Jurassic (richer in A, Bi and Bii types) and Cretaceous (dominant A, Ci and Cii types) samples. U–Pb dating of detrital zircon and their statistical integration with the above-mentioned datasets provide further insights into changes in provenance and/or drainage systems. Metamorphic rocks of the early and late Pan-African orogeny terranes of the Mozambique Belt and those of the Irumide Belt acted as main source of sediment during the Jurassic. Cretaceous sediments record a broadening of the drainage system reaching as far as the Usagran–Ubendian Belt and the Tanzanian Archean Craton.
10
Sirenko, Olena A., and Olena A. Shevchuk. "Levels of changes in the genus Pinus Linné in the composition of Mesozoic and Cenozoic flora and vegetation as an additional criterion for the division of sediments by the Mesozoic and Cenozoic of Ukraine." Journal of Geology, Geography and Geoecology 30, no. 4 (December 27, 2021): 741–53. http://dx.doi.org/10.15421/112168.
Повний текст джерелаАнотація:
The article presents an analysis of a large array of results of palynological studies of Mesozoic and Cenozoic sediments of Ukraine and adjacent regions of Belarus and Russia. Numerous literature data on the palynological characteristics of Meso-Cenozoic sediments and the materials of the authors are summarized according to the results of spore-pollen analysis of Mesozoic and Cenozoic sediments within the main tectonic structures of Ukraine. It has been established that the genus Pinus (Pinaceae) is an integral part of the Meso-Cenozoic flora of Ukraine. Although, the participation in the flora and vegetation of the genus Pinus and its species diversity in different periods of geological time were different. Despite the long history and significant achievements of palynological research of Meso-Cenozoic sediments of Ukraine, no attention has been paid to the historical aspect of Pinus development in the Meso-Cenozoic flora. This work is presented as the first stem to fill this gap. The genus Pinus has a large stratigraphic range, but its species diversity and quantitative changes in the composition of Mesozoic and Cenozoic flora of different ages are markedly different. The analysis of these changes made it possible to trace the emergence and main levels at which the species composition was renewed and the role of Pinus in flora increased during the Mesozoic and Cenozoic. According to the results of the research, 5 levels of increasing the participation of the genus Pinus and changes in its species affiliation in the Mesozoic flora were established: Aalenian period of the Middle Jurassic (appearance of the first representatives of Pinus); Oxfordian time of the Late Jurassic; Valanginian – Early Barremian times of the Early Cretaceous; Albian time of the Early Cretaceous; Late Campanian time of the Late Cretaceous. 5 levels of increasing the role of Pinus and its species diversity for the flora and vegetation of the Cenozoic were also established: Oligocene time of the Paleogene, Konkian-early Sarmatian time of the Middle Miocene; early Pontian (Ivankov) time of the Late Miocene; early Kimmerian time (early Sevastopol) of the Early Pliocene and Martonosha time of the Early Neopleistocene. Certain levels have been traced for the similar age of Cenozoic flora of Belarus and Russia.
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Halamić, Josip, Zoran Peh, Dragan Bukovec, Slobodan Miko, and Lidija Galović. "A Factor Model of the Relationship between Stream Sediment Geochemistry and Adjacent Drainage Basin Lithology, Medvednica Mt., Croatia." Geologia Croatica 54, no. 1 (June 30, 2001): 37–51. http://dx.doi.org/10.4154/gc.2001.04.
Повний текст джерелаАнотація:
A mathematical model is constructed to relate the geochemical composition of recent stream material in a number of catchments on Medvednica Mt. to a broadely defined bedrock lithology which represents the parent material for the former. It is a system based factor model, which synthesizes eight lithological and 25 geochemical variables (major, minor and trace elements), reducing their relationships to six geologically meaningful factors. Five of these divulged a definite relationship between geochemistry and lithology. These are labelled as follows: factor of metamorphic rocks; factor of igneous rocks; factor of Tertiary carbonate rocks; factor of parametamorphic rocks and factor of Mesozoic carbonate rocks. Two lithologies; the Mesozoic clastic rocks and Quaternary sediments showed no clear association to any of the factors. Alternatively, one of the factors (F2) can be identified as “non-lithologic” indicating other, perhaps anthropogenic, contributions to the stream sediment geochemical composition.
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Kumar, Pramod. "Palynology of the Mesozoic sediments exposed near Ellichpur, Maharashtra." Journal of Palaeosciences 39, no. (1-3) (December 31, 1990): 381–87. http://dx.doi.org/10.54991/jop.1990.1701.
Повний текст джерелаАнотація:
The paper records palynofossils from the dark grey shales/clays (inliers) exposed at Belkher Village, north of Ellichpur town in Maharashtra. The assemblage contains 41 species assigned to 22 genera and is characterised by pteridophytic and bryophytic components, viz., Callispora potoniei, Contignisporites glebulentus, Murospora, Triporoletes reticulatus, Coptospora kutchensis, Cooksonites cf. C. rajmahalensis, etc. The prominence of Callialasporites followed by Podocarpidites, Alisporites and Araucariacites is noteworthy. The assemblage is comparable to the palynozones-D of Rajmahal Hills, the assemblage recovered from Sivaganga area of Cauvery Basin, and Dharesi nala section of Bhuj Formation, Kutch Basin, which are assigned a Neocomian-Aptian age. The presence of spore-pollen, algal or fungal entities suggests freshwater conditions during deposition.
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Sukh-Dev. "Floristic zones in the Mesozoic formations and their relative age." Journal of Palaeosciences 36 (December 31, 1987): 161–67. http://dx.doi.org/10.54991/jop.1987.1572.
Повний текст джерелаАнотація:
Through a comprehensive analytical study of the Mesozoic flora and synthesis of the available data 12 assemblage zones and a floral succession are established. These assemblage zones also extend into the Early Cretaceous flora in the neighboring countries: Pakistan, Nepal, Bhutan and Sri Lanka. The Gondwana Triassic elements and the European Jurassic-Cretaceous elements in the flora are highlighted. The inter-relationship of the Mesozoic floras of Gondwanaland, European and Asian countries is examined. The relative age of the biozones is worked out on the basis of plant megafossils, palynology, paleontology, stratigraphy and radiometry. It is suggested that the concept of Gondwana be replaced by chronostratigraphic terms, viz., Triassic, Jurassic and Cretaceous for the Indian Mesozoic sediments.
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Morrison, Kurt, Gareth J. Dyke, and Luis M. Chiappe. "Cretaceous fossil birds from Hornby Island (British Columbia)." Canadian Journal of Earth Sciences 42, no. 12 (December 1, 2005): 2097–101. http://dx.doi.org/10.1139/e05-081.
Повний текст джерелаАнотація:
We present the first records of Mesozoic fossil birds to be described from British Columbia. New fossil avians from the Campanian Northumberland Formation on Hornby Island (Strait of Georgia) add to the known distributions of two groups of fossil birds during the latter stage of the Mesozoic. New specimens referred to the clades Ornithurae and Enantiornithes demonstrate the presence of a diverse marine avifauna in Canadian Pacific marine sediments prior to the CretaceousTertiary (KT) boundary. These new fossil bird remains from coastal rocks on the west coast of British Columbia lend further support to suggestions that ocean-going birds were important constituents of marine ecosystems in the terminal stages of the Mesozoic.
15
Clowes, Ron M., and Ewa Gens-Lenartowicz. "Upper crustal structure of southern Queen Charlotte Basin from sonobuoy refraction studies." Canadian Journal of Earth Sciences 22, no. 11 (November 1, 1985): 1696–710. http://dx.doi.org/10.1139/e85-178.
Повний текст джерелаАнотація:
The Queen Charlotte Basin, which lies on the west coast of Canada, was the location of a petroleum exploration program in the 1960's. Recently published tectonic models indicate that estimates of hydrocarbon potential require re-evaluation, and a renewed exploration interest has been expressed. In 1981, a seismic refraction survey of the upper crust using radio-telemetering sonobuoys and a 27 L air-gun source was carried out. A particular objective of the study was to determine the existence and depth extent of any sedimentary layer, hypothesized on the basis of other studies, beneath or within the Tertiary Masset volcanics in which some of the exploration wells had terminated. Three reversed profiles and one unreversed profile up to 40 km long were recorded. Interpretation of the data made use of the travel-time and amplitude information of the seismic sections by comparison with theoretical sections computed by two-dimensional ray tracing and a new asymptotic ray theory synthetic seismogram algorithm.Consistent with the earlier industry results, sediment thicknesses vary considerably throughout the southern Queen Charlotte Basin. The Tertiary Masset volcanics appear to be pervasive throughout the study area, with thicknesses varying from less than 1 km to greater than 3 km. On three of the four profiles a low-velocity layer, interpreted as Mesozoic sediments or sediments interbedded with volcanics, was found to lie beneath the volcanics. Thicknesses ranged from about 1 km to zero at a pinchout. The lowermost layer of all models is considered to be crustal rocks and is identified with the top of Wrangellia, an allochthonous terrane proposed to underlie the southern Queen Charlotte Basin. Along the profile for which no low-velocity layer sediments were interpreted, the Wrangellia terrane forms a dome rising to within 2 km of the surface. Other recent studies suggest that hydrocarbon sources could be associated with the Mesozoic rocks of Wrangellia and with any sediments underlying the Tertiary lavas, as well as with Tertiary marine sediments above the volcanics. Thus further exploration is warranted.
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Zinchuk, N. N. "Specific features of diamonds from ancient sedimentary thick layers on territories of crystallyne rock masses influence." Мінеральні ресурси України, no. 3 (October 16, 2019): 22–29. http://dx.doi.org/10.31996/mru.2019.3.22-29.
Повний текст джерелаАнотація:
Analysis of available materials on specific features of diamonds from Upper Paleozoic and Mesozoic sediments of main diamondiferous regions of the Siberian platform north-east (Anabar, Muna-Tyung, Nizhnelensk and Prilensk regions) allows asserting about definite in
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Aslanov, B. S., A. I. Khuduzade, R. A. Asgerova, Yu F. Ismailzade, and A. V. Baghirly. "Impact of tectonic faults on formation of oil-gas traps in Yevlakh-Aghjabedi oil-gas bearing region." Azerbaijan Oil Industry, no. 3 (March 15, 2021): 4–10. http://dx.doi.org/10.37474/0365-8554/2021-3-4-10.
Повний текст джерелаАнотація:
Via geological-geophysical surveys carried out on the north-east border of Yevlakh-Aghjabedy downfold in the second half of the last century, the oil-gas bearing content of deeply-immersed Mesozoic horizons of Upper Cretaceous, as well as shallow layers of Paleogene and Miocene has been defined. Oil-gas bearing Productive Series have been discovered within Muradkhanly, Zardab, Shykhbaghy and Jafarli structures, which belong to Zardab-Muradkhanly-Jafarli belt. Oil-gas reservoirs are lithologically associated mainly with fractured superfusive and carbonate rocks of Upper Cretaceous, as well as sedimentary-volcanogenic rocks of Middle Eocene and partially terrigenic collectors of Maikop-Chokrak, which are layer-arch type of trap. Some researchers came to the conclusion that within favorable geological circumstances on the north-east border of the downfold, collectors of Mesozoic sediments may contain industrial oil and gas deposits as well. To that end, recently the major capacity of exploration drilling and geoexploration was focused within Yevlakh-Aghjabedy downfold, where Mesozoic structures are widespread alongside with Paleogen-Miocene sediments. Deep structural-tectonic framework and oil-gas bearing content both on south-west and north-east slopes of the downfold was specified via the results of conducted works. It was defined that by hydrocarbon saturation, north-west and south-east slopes sharply differ from each other both in the view of structural-tectonic and oil-gas bearing capacity, probably associated with various cycles of folding of Cenozoic and Mesozoic ages.
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VRŠANSKÝ, PETER. "A new genus and species of cockroach (Blattida: Phyloblattidae) from the Permian/Triassic boundary beds of Tunguska Basin in eastern Siberia, Russia." Zootaxa 2353, no. 1 (February 8, 2010): 55. http://dx.doi.org/10.11646/zootaxa.2353.1.5.
Повний текст джерелаАнотація:
Macroscopic fossils of terrestrial animals originating directly from deposits close to the Permian/Triassic boundary are very scarce. Volcanic ash sediments in Eastern Siberia were found to hold the cockroach Sobytie tungusicum gen. et sp. n. This new taxon belongs to the predominantly Palaeozoic family Phyloblattidae, but has many advanced features characteristic of the Mesozoic family Caloblattinidae, and also of the basal Liberiblattinidae. These connections provide an indication of the origin of the family Liberiblattinidae and thus all the Mesozoic cockroach lineages from such Phyloblattidae – precursors of the Caloblattinidae.
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Klug, Linus, and Nikolaus Froitzheim. "Reuniting the Ötztal Nappe: the tectonic evolution of the Schneeberg Complex." International Journal of Earth Sciences 111, no. 2 (November 27, 2021): 525–42. http://dx.doi.org/10.1007/s00531-021-02127-4.
Повний текст джерелаАнотація:
AbstractThe Ötztal Nappe in the Eastern Alps is a thrust sheet of Variscan metamorphic basement rocks and their Mesozoic sediment cover. It has been argued that the main part of the Ötztal Nappe and its southeastern part, the Texel Complex, belong to two different Austroalpine nappe systems and are separated by a major tectonic contact. Different locations have been proposed for this boundary. We use microprobe mapping of garnet and structural field geology to test the hypothesis of such a tectonic separation. The Pre-Mesozoic rocks in the area include several lithotectonic units: Ötztal Complex s.str., Texel Complex, Laas Complex, Schneeberg Complex, and Schneeberg Frame Zone. With the exception of the Schneeberg Complex which contains only single-phased (Eoalpine, i.e. Late Cretaceous) garnet, all these units have two-phased garnet with Variscan cores and Eoalpine rims. The Schneeberg Complex represents Paleozoic sediments with only low-grade (sub-garnet-grade) Variscan metamorphism which was thrust over the other units and their Mesozoic cover (Brenner Mesozoic) during an early stage of the Eoalpine orogeny, before the peak of Eoalpine metamorphism and garnet growth. Folding of the thrust later modified the structural setting so that the Schneeberg Thrust was locally inverted and the Schneeberg Complex came to lie under the Ötztal Complex s.str. The hypothesized Ötztal/Texel boundaries of earlier authors either cut across undisturbed lithological layering or are unsupported by any structural evidence. Our results support the existence of one coherent Ötztal Nappe, including the Texel Complex, and showing a southeastward increase of Eoalpine metamorphism which resulted from southeastward subduction.
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Mankenov, K. K. "Comprehensive analysis for appraisal of oil and gas potential in the pre-jurassic part of the Ozen-Karamandybas field." Kazakhstan journal for oil & gas industry 2, no. 4 (December 15, 2020): 36–41. http://dx.doi.org/10.54859/kjogi95590.
Повний текст джерелаАнотація:
Questions about the prospects for the oil and gas potential of the Paleozoic sediments of the Mangyshlak sedimentary basin remain open to this day, despite a long history of study and large volumes of research. This is primarily due to the imperfection of previously used prospecting and exploration technologies and the sufficiency of the discovered reserves of discovered deposits in the Mesozoic part of the section. Given the current situation of natural depletion of reserves in the Mesozoic sediments, there is a need to set up prospecting and exploration work in the deep horizons of the Paleozoic.
The article provides general information about the study of the region, and on the basis of the proven facts of oil and gas content of individual areas and the latest drilling results obtained, raised the question of the oil and gas potential of pre-Jurassic deposits.
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Tripathi, Archana, R. S. Tiwari, and Pramod Kumar. "Palynology of the subsurface mesozoic sediments in Rajmahal basin, Bihar." Journal of Palaeosciences 37, no. (1-3) (December 31, 1988): 367–88. http://dx.doi.org/10.54991/jop.1988.1631.
Повний текст джерелаАнотація:
Palynological study of Mesozoic sediments (Late Triassic to Late Jurassic/Early Cretaceous) from a bore-hole RJR-2 drilled near Kazigaon Village in Rajmahal Basin has been done and 76 genera and 132 species have been recognised. Of them, one genus and 13 species are new. A check-list along with descriptions of new proposals have been given. The distribution of various species in Rajmahal and Dubrajpur formations is distinct. Palynological succession denotes three identifiable associations of the Late Carnian, Early Norian and Late Jurassic/ Early Cretaceous age.
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Chistyakova, N. F. "PORE SOLUTIONS OF MESOZOIC SEDIMENTS FROM THE WEST SIBERIAN BASIN." Oil and Gas Studies, no. 5 (October 30, 2018): 84–88. http://dx.doi.org/10.31660/0445-0108-2018-5-84-88.
Повний текст джерелаАнотація:
The article deals with the analysis of the chemical composition of pore solutions pressed from terrigenous rocks at pressures of 5-10-15-400 atm. Particular attention is paid to sulfate and hydrocarbonate ions of relict water - pore solutions - indicators of the realization of the oil and gas potential of rocks containing dispersed organic matter of subaquatic origin at the stage of catagenesis.
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Rawnsley, K. D., D. C. P. Peacock, T. Rives, and J. P. Petit. "Joints in the Mesozoic sediments around the Bristol Channel Basin." Journal of Structural Geology 20, no. 12 (December 1998): 1641–61. http://dx.doi.org/10.1016/s0191-8141(98)00070-4.
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Howard, James D., and Indra Bir Singh. "Trace fossils in the Mesozoic sediments of Kachchh Western India." Palaeogeography, Palaeoclimatology, Palaeoecology 52, no. 1-2 (November 1985): 99–121. http://dx.doi.org/10.1016/0031-0182(85)90033-1.
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Vejbæk, Ole Valdemar. "Seismic Stratigraphy and Tectonics of Sedimentary Basins around Bornholm Southern Baltic." Danmarks Geologiske Undersøgelse Serie A 8 (October 1, 1985): 1–30. http://dx.doi.org/10.34194/seriea.v8.7027.
Повний текст джерелаАнотація:
Identification of structural elements in the offshore area around Bornholm has been possible with the use of reflection seismic data. The area straddles the Fennoscandian Borderzone, extending into the Danish Polish Trough. Major structural depressions are the Rønne Graben, the Arnager Graben (new name), the Christiansø Half-graben and the Hano Bay Basin. Structural highs are the Christiansø High, the Hammervand High, the Bornholm Gat Uplift, The Dueodde High (new name), the Southern Bornholm High (new name) and Bornholm High. The Palaeozoic sediments show rapidly increasing thicknesses to the south towards the Caledonian deformation front, and to the east towards the Peribaltic Syneclise. The present distribution of thick Palaeozoic sediments is however primarily a result of Late Palaeozoic–Early Mesozoic erosion. Occurences of Triassic, Jurassic and Lower Cretaceous sediments are primarily restricted to graben areas. These were generated in a Late Carboniferous-Early Permian tension dominated right-lateral wrench fault system parallel to the Tornquist line. The Mesozoic sediments of the above-mentioned ages were deposited in expanding basins interrupted by tectonic activity, which resulted in renewed restriction of sediments to graben areas accompanied by erosion on structural highs. Late Jurassic and Late Early Cretaceous tectonic events are identified. The most spectacular tectonic event is of an Early Tertiary age. The Rønne Graben and the Arnager Graben were subjected to compression in a right lateral fault system during this phase, and were subsequently uplifted and erosion occurred accompanied by reverse faulting and minor folding.
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Luetgert, James H., Harley M. Benz, and Sriram Madabhushi. "Crustal Structure Beneath the Atlantic Coastal Plain of South Carolina." Seismological Research Letters 65, no. 2 (April 1, 1994): 180–91. http://dx.doi.org/10.1785/gssrl.65.2.180.
Повний текст джерелаАнотація:
Abstract In April, 1991, a northwest-southeast trending 120-km-long seismic refraction/wide-angle reflection profile was recorded across the Atlantic Coastal Plain of South Carolina, the passive margin of the eastern United States formed by Mesozoic extension during the opening of the Atlantic and Gulf of Mexico. Two-dimensional ray tracing of first arrivals and reflections indicates large lateral velocity variations in the upper 5 km of the crust. From northwest to southeast along the profile, Coastal Plain sediments thicken from a few tens of meters to more than 1 km. P-wave velocities within the sediments range from 1.85 to 3.5 km s−1, while intercalated basalts have velocities of 5.2–5.5 km s−1. The top of the crystalline basement dips eastward and is characterized by velocities of 6.0–6.2 km s−1. High velocities of 6.2 km s−1 within the crystalline basement are locally restricted to a shallow 25-km-wide zone adjacent and east of the Dunbarton basin. Seismic, gravity and magnetic observations suggest that this anomaly represents a pre-Cretaceous mafic intrusion formed during Mesozoic rifting. Mesozoic rifting is also evident from observed eastward thinning of the crust from 37 to 32 km along the profile.
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Yadagiri, P., and B. R. J. Rao. "Contribution to the stratigraphy and vertebrate fauna of Lower Jurassic Kota Formation, Pranhita-Godavari Valley, India." Journal of Palaeosciences 36 (December 31, 1987): 230–44. http://dx.doi.org/10.54991/jop.1987.1583.
Повний текст джерелаАнотація:
Gondwana Sequence of the Pranhita-Godavari Valley represents a thick succession of sediments ranging in age from Early Permian to Early Cretaceous. The Mesozoic Gondwana sediments contain a number of vertebrate bearing zones which are important for correlation and for assigning age to different units. New data on the vertebrate fossils of Kota Formation help trace the evolutionary history of early Jurassic mammals and dinosaurs and palaeogeographic configuration. The status of Gangapur Formation, as a unit, overlying Kota Formation and underlying Chikiala Formation is elaborated. Its lithological identity is established in the Yamanpalli area. Measured lithostratigraphic column of the limestone zone of the Kota Formation is described with the lithological variations and fossil contents. The data is useful for the correlation of limestone members in delineating the Kota Formation along its strike. Analysis of the geochemical data and vertebrate fossil community of Mesozoic sediments with particular emphasis on the Kota Formation, provide overwhelming evidences for freshwater environment of deposition of the Kota Formation. The evolutionary status of vertebrate fauna consisting of early mammals, dinosaurs and pholidophorid fishes is described which supports the Jurassic age of the Kota Formation.
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J.J., Movlanov, and S. M. Koloskova. "Main Features Of The Geodynamic Evolution Of Domesozoic Formations And Metallogenic Zoning Of Endogenous Gold Mineralization Of The Tien-Shan Origenic Vein System." American Journal of Applied Sciences 02, no. 10 (October 31, 2020): 70–82. http://dx.doi.org/10.37547/tajas/volume02issue10-12.
Повний текст джерелаАнотація:
Geochemical testing covered the entire territory of Uzbekistan, but with varying degrees of detail. Most, 85-88% of the republic's area is covered with Mesozoic and Cenozoic sediments, with which exogenous deposits are associated. Pre-Mesozoic formations - the environment of localization of endogenous deposits, confined to the mountain systems of the Median and South Tien Shan. Mountain heights with outcrops of Pre-Mesozoic rocks occupy about 12-15% in area, the rest is in semi-closed and closed territories. Primary halos are recorded on the surface and at depth, secondary ones on the surface, as well as near it: below the raft - in water, above - in the surface atmosphere. Improving forecasting efficiency in regional geochemical works, interpretation and assessment of different-rank ore-generating geochemical anomalies in complex landscape-geological conditions.
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Stea, Rudolph R., and Susan E. Pullan. "Hidden Cretaceous basins in Nova Scotia." Canadian Journal of Earth Sciences 38, no. 9 (September 1, 2001): 1335–54. http://dx.doi.org/10.1139/e01-023.
Повний текст джерелаАнотація:
Early Cretaceous unconsolidated quartz sand and kaolinitic clay deposits in the lowlands of Nova Scotia are preserved in narrow half-grabens obscured by glacial drift. The Chaswood Formation sediments can be subdivided into three members; upper and lower members dominated by cyclical sandmud facies of fluvial origin and the middle member with lignitic clay of lacustrine origin. Ferruginous oxisols are common in the fine-grained facies of the upper and lower members. Seismic data indicate that Chaswood Formation strata in the Elmsvale Basin are deformed into steeply dipping faults and fault-related folds (Rutherford Road fault zone). An AptianAlbian age for this tectonic event is inferred from synsedimentary deformation and from the angular unconformity spanning the Late Cretaceous and Tertiary that truncates the Chaswood Formation. Exhumation of a thick cover of Mesozoic sediment (12 km) is needed to account for the preservation of Chaswood Formation outliers after ~80 Ma of erosion. The half-grabens that host the Chaswood Formation were formed in the Mesozoic and were antecedent to the present-day structurally controlled lowlands.
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Venkatachala, B. S., and A. Rajanikanth. "Stratigraphic implication of 'Late Gondwana' floras in the East Coast." Journal of Palaeosciences 36 (December 31, 1987): 183–96. http://dx.doi.org/10.54991/jop.1987.1576.
Повний текст джерелаАнотація:
The Cauvery, Palar, Krishna-Godavari and Mahanadi basins in the East Coast of India include coeval, paralic, lagoonal and deltaic Mesozoic (‘Late Gondwana’) deposits distributed in detached outcrops. The ‘Ptilophyllum Flora’ characterizing these sediments was earlier considered Jurassic in age. Considerable floristic and stratigraphic data have accrued necessitating a relook on earlier age assignments and stratigraphic placements. Biostratigraphic evidences considered in toto suggest an Early Cretaceous age to the flora found in these sediments. Sedimentation of these sediments is attributed to rifting of the Indian Plate coupled with a reactivation phase. It is recommended that the term ‘Gondwana’ should either be recircumscribed to include marine coastal sediments or discontinued in favor of the usage of chronostratigraphic terminology.
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Arfai, Jashar, Fabian Jähne, Rüdiger Lutz, Dieter Franke, Christoph Gaedicke, and Jonas Kley. "Late Palaeozoic to Early Cenozoic geological evolution of the northwestern German North Sea (Entenschnabel): New results and insights." Netherlands Journal of Geosciences - Geologie en Mijnbouw 93, no. 4 (August 19, 2014): 147–74. http://dx.doi.org/10.1017/njg.2014.22.
Повний текст джерелаАнотація:
AbstractThe results of a detailed seismic mapping campaign of 13 horizons in the northwestern German North Sea, covering Late Permian to Palaeogene sedimentary successions, are presented. Based on the interpretation of four 3D and two 2D seismic surveys, thickness and depth maps of prominent stratigraphic units were constructed. These maps provide an overview of key structural elements, the sedimentation and erosion, and give insights into the evolution of the German Central Graben. The base of the Zechstein Group reaches a maximum depth of 7800 m within the German Central Graben. Lateral thickness variations in the Zechstein reflect the extensive mobilisation of Zechstein salt. Complex rift-related structures, with the Central Graben as the main structural element, were found not later than the Early Triassic. Up to 3000-m thick Triassic sediments are preserved in the eastern German Central Graben of which 1800 m consist of Keuper sediments. The Lower Buntsandstein unit shows increasing thicknesses towards the southeastern study area, likely related to distinct lateral subsidence. As a consequence of uplift of the North Sea Dome, Middle Jurassic sediments were eroded in large parts of the northwestern German North Sea and are only preserved in the German Central Graben. The NNW–SSE oriented John Basin is another important structural element, which shows maximum subsidence during the Late Jurassic. In most parts of the study area Lower Cretaceous sediments are absent due to either erosion or non-deposition. Lower Cretaceous deposits are preserved in the Outer Rough Basin in the northwest and within the German Central Graben. Upper Cretaceous sediments are found at depths between 1500 and 3600 m, reaching a maximum thickness of approximately 1600 m on the Schillgrund High. Contraction and inversion of pre-existing Mesozoic faults during the Late Cretaceous is distinct at the Schillgrund Fault, i.e. the eastern border fault of the Central Graben. The Palaeogene is predominantly a period of strong basin subsidence. Within 37 Myrs, up to 1400 m of Palaeogene sediments were deposited in the northwesternmost part of the study area. Detailed mapping of salt structures enables a reconstruction of halokinetic movements over time and a deciphering of the influence of the Zechstein salt on the sedimentary evolution during the Mesozoic and Cenozoic. Increasing sediment thicknesses in rim-synclines indicate that most of the salt structures in the German Central Graben had their main growth phase during the Late Jurassic.
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Sirevaag, Hallgeir, Anna Ksienzyk, Joachim Jacobs, István Dunkl, and Andreas Läufer. "Tectono-Thermal Evolution and Morphodynamics of the Central Dronning Maud Land Mountains, East Antarctica, Based on New Thermochronological Data." Geosciences 8, no. 11 (October 26, 2018): 390. http://dx.doi.org/10.3390/geosciences8110390.
Повний текст джерелаАнотація:
The lack of preserved Mesozoic–Cenozoic sediments and structures in central Dronning Maud Land has so far limited our understanding of the post-Pan-African evolution of this important part of East Antarctica. In order to investigate the thermal evolution of the basement rocks and place constraints on landscape evolution, we present new low-temperature thermochronological data from 34 samples. Apatite fission track ages range from 280–85 Ma, while single-grain (U-Th)/He ages from apatite and zircon range from 305–15 and 420–340 Ma, respectively. Our preferred thermal history models suggest late Paleozoic–early Mesozoic peneplanation and subsequent burial by 3–6 km of Beacon sediments. The samples experienced no additional burial in the Jurassic, thus the once voluminous continental flood basalts of western Dronning Maud Land did not reach central Dronning Maud Land. Mesozoic–early Cenozoic cooling of the samples was slow. Contrary to western Dronning Maud Land, central Dronning Maud Land lacks a mid-Cretaceous cooling phase. We therefore suggest that the mid-Cretaceous cooling of western Dronning Maud Land should be attributed to the proximity to the collapse of the orogenic plateau at the Panthalassic margin of Gondwana. Cooling rates accelerated considerably with the onset of glaciation at 34 Ma, due to climate deterioration and glacial denudation of up to 2 km.
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Amiribesheli, Said, and Andrew Weller. "The prospectivity of the Cape Vogel Basin, Papua New Guinea." APPEA Journal 59, no. 2 (2019): 840. http://dx.doi.org/10.1071/aj18094.
Повний текст джерелаАнотація:
The frontier and underexplored Cape Vogel Basin (CVB), north of the Papuan Peninsula, is thought to be underlain by Late Palaeocene–Eocene oceanic crust and overlain by Cenozoic sediments. Several impartial data provide evidence of working petroleum system(s) including a flow of oil from a 1920s well, and two 1970s wells that encountered minor hydrocarbon traces and good source material. The 1970s wells chased Miocene reef plays (like the discoveries in the Gulf of Papua). No Miocene reefs were encountered, with both wells terminating in volcanics. Integration of open-file 2D seismic, modern 2D PSDM seismic and shipborne gravity and magnetic data improves the subsurface imaging and thus understanding of prospectivity. The data reveal a significant sedimentary section (including Mesozoic sediments) and that the volcanics are not laterally continuous (i.e. products of short periods of volcanism). The data also suggests several Mesozoic–Cenozoic plays (e.g. carbonate reefs, incised canyons). Repeatable sea surface slicks, and observable bottom-simulating reflectors and direct hydrocarbon indicators, also provide evidence of working petroleum system(s). It is hypothesised that the CVB has affinities with the Gulf of Papua with the extension of the Australian craton north of the Papuan Peninsula, with widespread deposition in the Mesozoic–Cenozoic, and with source rocks estimated to be within the hydrocarbon generative window. With incorporation of onshore data and presence of significant gravity low, it is postulated that the central and north-west were less susceptible to Late Cretaceous and Palaeocene differential uplift and erosion (related to Coral Sea breakup and extension), and thus have a higher chance of Late Mesozoic preservation.
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Gravesen, Peter. "Petrography of the quartz sand deposits of the Lower Cretaceous of Bornholm, Denmark." Danmarks Geologiske Undersøgelse Serie A 10 (June 1, 1986): 1–24. http://dx.doi.org/10.34194/seriea.v10.7029.
Повний текст джерелаАнотація:
The quartz sand of the Lower Cretaceous Robbedale Formation and lowermost part of the Jydegard Formation in the Arnager-Sose fault block of Bornholm has been investigated with respect to mineralogy, grain-size, grain rounding and grain shape. Analyses of both light and heavy minerals have been carried out for 18 samples from different localities and facies. The purpose of the investigation was to try to recognize the possible types of source rocks and provenance areas. The Precambrian basement rocks of Bornholm are not the main sources of the sand, especially not the heavy minerals, but parts of the sand may have originated from the basement. The Palaeozoic sandstones and siltstones have delivered only a small amount of material. Parts of the older Mesozoic sediments of the Bornholm Group and Homandshald Member may have been redeposited in the Lower Cretaceous as they contain the same kinds of heavy minerals as the Robbedale and Jydegard Formations, although in differing amounts. It seems very possible, however, that most of the Mesozoic sediments of Bornholm have had a source area outside Bornholm, and this source area has been nearly the same during the whole span of time. The Fenno-Scandian Shield seems to be the most obvious provenance area, but eastern and southern areas are possibilities too. It is concluded that most of the Lower Cretaceous sands are first deposition cycle sediments of both local and distant origin combined with minor amounts of polycyclic sediments of mainly local origin.
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Pechersky, D. M. "Metallic iron in sediments at the Mesozoic-Cenozoic (K/T) boundary." Russian Journal of Earth Sciences 10, no. 5 (September 18, 2008): 1–9. http://dx.doi.org/10.2205/2008es000304.
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Murty, A. S. N., Kalachand Sain, V. Sridhar, A. S. S. S. R. S. Prasad, and S. Raju. "Delineation of Trap and Subtrappean Mesozoic Sediments in Saurashtra Peninsula, India." Current Science 110, no. 9 (May 1, 2016): 1844. http://dx.doi.org/10.18520/cs/v110/i9/1844-1851.
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Zhmodik, S., P. Ivanov, D. Belyanin, E. Airiyants, O. Kiseleva, and A. Travin. "The glasses from Mesozoic sediments of Anabar region (Arctic Siberia, Russia)." IOP Conference Series: Earth and Environmental Science 319 (September 19, 2019): 012023. http://dx.doi.org/10.1088/1755-1315/319/1/012023.
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Alhadiathy, Abdul Hameed A., and Isam Najar. "Tectonostratigraphic Evolution of the Western Desert of Iraq." IOP Conference Series: Earth and Environmental Science 1080, no. 1 (September 1, 2022): 012006. http://dx.doi.org/10.1088/1755-1315/1080/1/012006.
Повний текст джерелаАнотація:
Abstract The study area is in the northern part of the Western Desert of Iraq. From the conclusion of Paleozoic and Mesozoic basins and their distribution according to the available geological (outcrops and boreholes) and geophysical data (seismic, gravity and magnetic interpretations controlled by geological data), it is found that, Triassic- Jurassic (and sometimes Cretaceous) basins are found closely related to the basic or ultrabasic basement (for example Anah, Tilul, and Ras Al-Fahama basins). These basins were formed by isostatic adjustment during the extension phase that took place in the Early Mesozoic (may be Triassic or Jurassic) which caused subsidence of heavy parts (basic or ultrabasic) of the basement. From the style and thickness of sediments it is clear that the northern and eastern parts of the area exhibit evidence of a tendency for uplift during Paleozoic times (forming ridges or horsts) and down-warping during the Mesozoic times (forming basins or grabens). While in contrast the western part of the area exhibits evidence or tendency for down-warping during Paleozoic forming basin or graben (as in Gaara basin) and uplift during the Mesozoic times.
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Dasgupta, Sanghita, Santanu Banerjee, and Parthasarathi Ghosh. "Petrographical and Geochemical Study of Syn-Rift Sediments, Pranhita-Godavari Intracratonic Gondwana Basin, India: Genesis and Paleo-Environmental Implications." Geosciences 12, no. 6 (May 30, 2022): 230. http://dx.doi.org/10.3390/geosciences12060230.
Повний текст джерелаАнотація:
The approximately 2 km thick fluvio-lacustrine deposits of Pranhita-Godavari Gondwana syn-rift basin, ranging in age from 235 to 196 Ma, track the compositional changes from the Middle Triassic to Early Jurassic. Mineralogical and geochemical investigations, as well as paleocurrent data of the siliciclastic deposits of the four conformable formations—Yerrapalli, Bhimaram, Maleri and Dharmaram—trace the source of sediments to the south and southwest of the Gondwana basin. The dominance of arkosic to sub-arkosic sandstones in all the formations suggests mostly felsic sources. The high value of Zr/Sc, as well a high content of Hf, reflects the addition of zircon by sediment recycling. The index of compositional variability (ICV) and chemical index of alteration (CIA) values of these Gondwana samples suggest intermediate weathering of Proterozoic shales, granites and gneisses. The concentration of Cr and Ni, ratios of Eu/Eu* and (GdN/YbN) suggest a dominant post-Archean source. The insignificant variation in ICV and CIA values across the studied Mesozoic formations corroborates the continuation of syn-rift tectonics of the Pranhita-Godavari Gondwana basin since the Late Paleozoic. Sandstone samples show a gradual shift from arkose to subarkose in Yerrapalli, Barakar and Maleri formations, and to sublithic arenite sandstones in the younger Dharmaram formation, indicating recycling. However, the insignificant variation of feldspar and/or quartz content throughout these Mesozoic formations suggests lesser tectonic activity. The paleocurrent direction, shifting from NNW to NE direction, suggests a change in basin tectonism and/or sediment supply, which is corroborated by mineralogical and geochemical data.
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Schmidt, Birthe J. "A source rock evaluation of the Mesozoic Sediments of the Well Hyllebjerg-1 Danish Subbasin." Danmarks Geologiske Undersøgelse Serie C 9 (April 30, 1988): 1–105. http://dx.doi.org/10.34194/seriec.v9.7103.
Повний текст джерелаАнотація:
The source rock potential of Mesozoic sediments (cuttings) from the Hyllebjerg 1 well, Danish Subbasin, has been assessed using a number of different petrographical and organochemical methods. Upper Jurassic sediments (Bream Formation) equivalent to the principal source rocks of the North Sea graben structures (Kimmeridge Clay Formation and lateral equivalents) do not show similar prominent source rock characteristics in this well, although a higher proportion of algal material is observed. Sediments with the most promising source rock characteristics for liquid hydrocarbons were· detected mainly in the lower- Jurassic sequences of the upper Fjerritslev Format ion (F-4 and upper F-3 Member) and in one horizon in the Upper Cretaceous Vedsted Formation which showed a good quality composition and a relatively high content of organic matter. But these sediments may be excluded as actual source rocks in this well as maturity (assuming the threshold value near 0. 60 % R ) is first reached at approximately 8500' 0 depth i.e. at the top of the Gassum Formation (Upper Triassic/ Lower Jurassic). The conditions may only by slightly different off - structure is this area, as the F-4 and F-3 Member sequence according to seismic sections is found at approximately the same depth. But the depth to ( and the thickness of) the Fjerritslev Formation is increasing towards the SE into the rimsynclines of the saltdomes nearby. While sufficient maturity is reached in the deeper part of the well, no commercial accumulations of hydrocarbons were encountered. This is attributed to the mainly reworked, unfavourable type of organic matter and the generally decreasing organic content downwards in the well, approaching the lower 1 imi t for potential source rocks ( set at O, 5% TOC). However, generation and migration of small amounts of gaseous hydrocarbons from Gassum Formation sediments containing more humic-influenced organic matter with only minor reworking cannot generally be excluded either here or elsewhere in the basin. Some more attention should also be paid to the Vinding Formation sediments which contain some algae- ri eh ( Botryocous-type) oil-prone horizons of more favourable source rock conditions. Mature sediments are found at shallower depths ( 8500 ') in this well in the central part of the basin compared to the more marginal areas (8900') where a slightly higher geothermal gradient in Jiyllebjerg 1 ( 28°C/km uncorrected) is seen compared with the marginal areas (23.5°C/km uncorrected) away from the basinal depocenter. The basinal depocenter also has a higher heat flow.
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Xu, Zhongjie, Yizhi Lan, Jintao Kong, Rihui Cheng, and Liaoliang Wang. "Detrital zircon U–Pb dating of Late Triassic Wenbinshan Formation in southwestern Fujian, South China, and its geological significance." Canadian Journal of Earth Sciences 55, no. 8 (August 2018): 980–96. http://dx.doi.org/10.1139/cjes-2018-0007.
Повний текст джерелаАнотація:
Based on research of the petrology, geochemistry, and zircon U–Pb dating of detrital rocks in the Late Triassic Wenbinshan Formation in southwestern Fujian, and comparing the detrital zircon ages of Wenbinshan Formation with those of Late Paleozoic – Early Mesozoic main basins in South China, the sedimentary provenance of the Late Triassic in southwestern Fujian and its implications for changes in basin properties are discussed. The research results demonstrate that there is a major age peak at 222 Ma, two subordinate age peaks at 275 Ma and 1851 Ma, and two minor age peaks at 413 Ma and 2447 Ma in the detrital zircon age spectra of the upper samples (YGP–6) of the Wenbinshan Formation, whereas there are two major age peaks at 229 Ma and 1817 Ma and other minor age peaks 265 Ma 309 Ma, 415 Ma, 1968 Ma, and 2435 Ma in the detrital zircon age spectra of the lower samples (YGP–26) of the Wenbinshan Formation. The upper samples contain fewer old detrital zircons than the lower samples, but the upper and lower samples of Wenbinshan Formation are similar in major age composition, which indicates the main provenances of the upper and lower sediments are very similar. The source rocks are mainly sedimentary rocks and their provenances are derived from a source area of recycled orogenic belt and volcanic arc orogenic belt (acidic island arc). The detrital zircon composition of the Wenbinshan Formation is mainly composed of Paleoproterozoic zircon and Late Paleozoic – Early Mesozoic zircon. In the Paleoproterozoic, sedimentary provenances were mainly derived from the Wuyi Massif and partly from northwestern Fujian-southwestern Zhejiang. As for the period of Late Paleozoic – Early Mesozoic, the provenances of the Wenbinshan Formation were derived from magmatic active belts of the Early Indosinian Epoch of northern South China, eastern South China, and the Indosinian Period of northern South China and coastal areas of eastern South China. The similarities and differences between detrital zircon age peaks of the Wenbinshan Formation in southwestern Fujian and that of the main basins in South China during the period of Late Paleozoic – Early Mesozoic indicate that from eastern coastal areas of South China to the north and interior of South China, the age composition of basin sediments has changed from simple to relatively complex, and from young sediments to older sediments. There are similarities and differences in the detrital zircon compositions of the different basins, which can indicate differences in the nature of the basins.
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Kneževič, Slobodan, and Vladan Radulović. "Important geological localities in the Belgrade area." Geologica Balcanica 26, no. 2 (June 30, 1996): 39–44. http://dx.doi.org/10.52321/geolbalc.26.2.39.
Повний текст джерелаАнотація:
The paper is presenting the most important geological fossil localities in the Belgrade area. Among Mesozoic rocks, it is the Summer Theatre at Topčider, a locality of fossil fauna from Lower and Upper Creataceous deposits. For Neogene sediments, the selection is made of the known fossiliferous rocks localities: Badenian – the Rakovica stream, Kalemegdan and Tašmajdan; Pannonian – the Karagača stream.
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Khormali, F., A. Abtahi, and H. R. Owliaie. "Late Mesozoic—Cenozoic clay mineral successions of southern Iran and their palaeoclimatic implications." Clay Minerals 40, no. 2 (June 2005): 191–203. http://dx.doi.org/10.1180/0009855054020165.
Повний текст джерелаАнотація:
AbstractClay minerals of calcareous sedimentary rocks of southern Iran, part of the old Tethys area, were investigated in order to determine their origin and distribution, and to reconstruct the palaeoclimate of the area. Chemical analysis, X-ray diffraction, transmission electron microscopy, scanning electron microscopy, and thin-section studies were performed on the 16 major sedimentary rocks of the Fars and Kuhgiluyeh Boyerahmad Provinces.Kaolinite, smectite, chlorite, illite, palygorskite and illite-smectite interstratified minerals were detected in the rocks studied. The results revealed that detrital input is possibly the main source of kaolinite, smectite, chlorite and illite, whilein situneoformation during the Tertiary shallow saline and alkaline environment could be the dominant cause of palygorskite occurrences in the sedimentary rocks.The presence of a large amount of kaolinite in the Lower Cretaceous sediments and the absence or rare occurrence of chlorite, smectite, palygorskite and illite are in accordance with the warm and humid climate of that period. Smaller amounts of kaolinite and the occurrence of smectite in Upper Cretaceous sediments indicate the gradual shift from warm and humid to more seasonal climate. The occurrence of palygorskite and smectite and the disappearance of kaolinite in the late Palaeocene sediments indicate the increase in aridity which has probably continued to the present time.
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Borissova, Irina, and Gabriel Nelson. "Petroleum potential of the offshore southern Carnarvon Basin—insights from new Geoscience Australia data." APPEA Journal 51, no. 2 (2011): 746. http://dx.doi.org/10.1071/aj10126.
Повний текст джерелаАнотація:
In 2008–9, under the Offshore Energy Security Program, Geoscience Australia (GA) acquired 650 km of seismic data, more than 3,000 km of gravity and magnetic data, and, dredge samples in the southern Carnarvon Basin. This area comprises the Paleozoic Bernier Platform and southern part of the Mesozoic Exmouth Sub-basin. The new seismic and potential field data provide a new insight into the structure and sediment thickness of the deepwater southernmost part of the Exmouth Sub-basin. Mesozoic depocentres correspond to a linear gravity low, in water depths between 1,000–2,000 m and contain between 2–3 sec (TWT) of sediments. They form a string of en-echelon northeast-southwest oriented depressions bounded by shallow-dipping faults. Seismic data indicates that these depocentres extend south to at least 24°S, where they become more shallow and overprinted by volcanics. Potential plays in this part of the Exmouth Sub-basin may include fluvio-deltaic Triassic sandstone and Lower–Middle Jurassic claystone source rocks sealed by the regional Early Cretaceous Muderong shale. On the adjoining Bernier Platform, minor oil shows in the Silurian and Devonian intervals at Pendock–1a indicate the presence of a Paleozoic petroleum system. Ordovician fluvio-deltaic sandstones sealed by the Silurian age marine shales, Devonian reef complexes and Miocene inversion anticlines are identified as potential plays. Long-distance migration may contribute to the formation of additional plays close to the boundary between the two provinces. With a range of both Mesozoic and Paleozoic plays, this under-explored region may have a significant hydrocarbon potential.
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Belyaeva, G. L. "Catagenetic Сharacteristics of Organic Matter of the Gydan Parametric Well Rocks". Вестник Пермского университета. Геология 20, № 3 (2021): 267–73. http://dx.doi.org/10.17072/psu.geol.20.3.267.
Повний текст джерелаАнотація:
The study of dispersed organic matter of the Mesozoic sediments of the Gydan parametric well 130 (north of Western Siberia) made it possible to reveal its genesis, maceral composition, and secondary changes. Obtained information allowed reconstructing and the catagenetic zoning of the section, determining the position of the lower boundary of oil occurrence, the main zones of oil and gas generation
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Wang, Yi Ni, Wen Liang Xu, Feng Wang, and Xiao Bo Li. "New insights on the early Mesozoic evolution of multiple tectonic regimes in the northeastern North China Craton from the detrital zircon provenance of sedimentary strata." Solid Earth 9, no. 6 (November 29, 2018): 1375–97. http://dx.doi.org/10.5194/se-9-1375-2018.
Повний текст джерелаАнотація:
Abstract. To investigate the timing of deposition and provenance of early Mesozoic strata in the northeastern North China Craton (NCC) and to understand the early Mesozoic paleotectonic evolution of the region, we combine stratigraphy, U–Pb zircon geochronology, and Hf isotopic analyses. Early Mesozoic strata include the Early Triassic Heisonggou, Late Triassic Changbai and Xiaoyingzi, and Early Jurassic Yihe formations. Detrital zircons in the Heisonggou Formation yield ∼ 58 % Neoarchean to Paleoproterozoic ages and ∼ 42 % Phanerozoic ages and were sourced from areas to the south and north of the basins within the NCC, respectively. This indicates that Early Triassic deposition was controlled primarily by the southward subduction of the Paleo-Asian oceanic plate beneath the NCC and collision between the NCC and the Yangtze Craton (YC). Approximately 88 % of the sediments within the Late Triassic Xiaoyingzi Formation were sourced from the NCC to the south, with the remaining ∼ 12 % from the Xing'an–Mongolia Orogenic Belt (XMOB) to the north. This implies that Late Triassic deposition was related to the final closure of the Paleo-Asian Ocean during the Middle Triassic and the rapid exhumation of the Su–Lu Orogenic Belt between the NCC and YC. In contrast, ∼ 88 % of sediments within the Early Jurassic Yihe Formation were sourced from the XMOB to the north, with the remaining ∼ 12 % from the NCC to the south. We therefore infer that rapid uplift of the XMOB and the onset of the subduction of the Paleo-Pacific Plate beneath Eurasia occurred in the Early Jurassic.
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Kontorovich, V. A., В. V. Lunev, and V. V. Lapkovsky. "GEOLOGICAL AND GEOPHYSICAL CHARACTERISTICS OF THE ANABAR‐KHATANGA OIL AND GAS PROVINCE; NUMERICAL MODELING OF THE PROCESSES OF FORMATION OF SALT DOMES (SIBERIAN SECTOR OF THE RUSSIAN ARCTICS)." Geodynamics & Tectonophysics 10, no. 2 (June 24, 2019): 459–70. http://dx.doi.org/10.5800/gt-2019-10-2-0421.
Повний текст джерелаАнотація:
The article discusses the geological structure, oil‐and‐gas‐bearing capacities and salt tectogenesis of the Anabar‐Khatanga saddle located on the Laptev Sea shore. In the study area, the platform sediments are represented by the 14‐45 km thick Neoproterozoic‐Mesozoic sedimentary complexes. The regional cross‐sections show the early and middle Devonian salt‐bearing strata and associated salt domes in the sedimentary cover, which may be indicative of potential hydrocarbon‐containing structures. Diapirs reaching the ground surface can be associated with structures capable of trapping hydrocarbons, and typical anticline structures can occur above the domes buried beneath the sediments. In our study, we used the algorithms and software packages developed by A.A. Trofimuk Institute of Petroleum Geology and Geophysics (IPGG SB RAS). Taking into account the structural geological features of the study area, we conducted numerical simulation of the formation of salt dome structures. According to the numerical models, contrasting domes that reached the ground surface began to form in the early Permian and developed most intensely in the Mesozoic, and the buried diapirs developed mainly in the late Cretaceous and Cenozoic.
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Hendy, Austin J. W. "The influence of lithification on Cenozoic marine biodiversity trends." Paleobiology 35, no. 1 (2009): 51–62. http://dx.doi.org/10.1666/07047.1.
Повний текст джерелаАнотація:
Recent research has corroborated the long-held view that the diversity of genera within benthic marine communities has increased from the Paleozoic to the Cenozoic as much as three- to fourfold, after mitigating for such biasing influences as secular variation in time-averaging and environmental coverage. However, these efforts have not accounted for the considerable increase in the availability of unlithified fossiliferous sediments in strata of late Mesozoic and Cenozoic age. Analyses presented here on the Cenozoic fossil record of New Zealand demonstrate that unlithified sediments not only increase the amount of fossil material and hence the observed diversity therein, but they also preserve a pool of taxa that is compositionally distinct from lithified sediments. The implication is that a large component of the difference in estimates of within-community diversity between Paleozoic and Cenozoic assemblages may relate to the increased availability of unlithified sediments in the Cenozoic.
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Kyzs’michev, A. B., A. V. Soloviev, V. E. Gonikberg, M. N. Shapiro, and O. V. Zamzhitskii. "Mesozoic syncollision siliciclastic sediments of the Bols’shoi Lyakhov Island (New Siberian Islands)." Stratigraphy and Geological Correlation 14, no. 1 (January 2006): 30–48. http://dx.doi.org/10.1134/s0869593806010035.
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EMEIS, KAY-CHRISTIAN, and HELMUT WEISSERT. "Tethyan-Mediterranean organic carbon-rich sediments from Mesozoic black shales to sapropels." Sedimentology 56, no. 1 (January 2009): 247–66. http://dx.doi.org/10.1111/j.1365-3091.2008.01026.x.
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