Статті в журналах: "Fluviolacustrine"

1

Zagorchev, Ivan. "Neogene fluviolacustrine systems in the northern Peri-Aegean Region." Geologica Balcanica 32, no. 2-4 (December 30, 2002): 139–44. http://dx.doi.org/10.52321/geolbalc.32.2-4.139.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

2

Han, J., W. S. Fyfe, F. J. Longstaffe, H. C. Palmer, F. H. Yan, and X. S. Mai. "Pliocene-pleistocene climatic change recorded in fluviolacustrine sediments in central China." Palaeogeography, Palaeoclimatology, Palaeoecology 135, no. 1-4 (December 1997): 27–39. http://dx.doi.org/10.1016/s0031-0182(97)00019-9.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

3

Huang (黄俊), Jun, Mark R. Salvatore, Christopher S. Edwards, Rachel L. Harris, and Philip R. Christensen. "A Complex Fluviolacustrine Environment on Early Mars and Its Astrobiological Potentials." Astrobiology 18, no. 8 (August 2018): 1081–91. http://dx.doi.org/10.1089/ast.2017.1757.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

4

Brodzikowski, K., R. Gotowała, A. Hałuszczak, D. Krzyszkowski, and A. J. Van Loon. "Soft-sediment deformations from glaciodeltaic, glaciolacustrine and fluviolacustrine sediments in the Kleszczów Graben (central Poland)." Geological Society, London, Special Publications 29, no. 1 (1987): 255–67. http://dx.doi.org/10.1144/gsl.sp.1987.029.01.19.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

5

Zagorchev, Ivan. "Late Cenozoic development of the Strouma and Mesta fluviolacustrine systems, SW Bulgaria and northern Greece." Quaternary Science Reviews 26, no. 22-24 (November 2007): 2783–800. http://dx.doi.org/10.1016/j.quascirev.2007.07.017.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

6

Kar, S. K., Surendra Prasad, and Gopendra Kumar. "Quaternary sediments of Indo-Gangetic, Brahmaputra and adjoining inland basins and the problem of demarcation of Pleistocene-Holocene Boundary." Journal of Palaeosciences 46, no. (1-2) (December 31, 1997): 196–210. http://dx.doi.org/10.54991/jop.1997.1340.

Повний текст джерела

Анотація:

The Quaternary sediments deposited in the Indo-Gangetic, Brahmaputra and adjoining smaller inland basins and Duns formed after the Middle Pleistocene Himalayan Orogenic Movement (HOM-4), are fluvial-fluviolacustrine and or lacustrine in nature. A synthesis of the available data in the Brahmaputra Basin and its comparison with that of the Indo-Gangetic Basin and Duns suggests two cycles of sedimentation, separated by a period of erosion and non-deposition and continuous in inland basins, such as Bhimtal-Naukuchia Tal, Hawalbagh in Kumaun region in Uttar Pradesh and Loktak Lake in Manipur. The sediments of the first cycle which terminated in late Upper Pleistocene are, in general, oxidised and referred to as the Older Alluvium, while that of the second assigned to Holocene, is unoxidised grey in color and constitutes the Newer Alluvium.

Стилі APA, Harvard, Vancouver, ISO та ін.

7

Eberth, D. A., D. A. Russell, D. R. Braman, and A. L. Deino. "The age of the dinosaur-bearing sediments at Tebch, Inner Mongolia, People's Republic of China." Canadian Journal of Earth Sciences 30, no. 10 (October 1, 1993): 2101–6. http://dx.doi.org/10.1139/e93-182.

Повний текст джерела

Анотація:

The coarsening-upward clastic sequence at Tebch, Inner Mongolia, China, containing the dinosaur Psittacosaurus mongoliensis, comprises the remains of a fluviolacustrine system deposited in an extensional tectonic setting.The presence of Asteropollis sp. cf. Asteropollis trichotomosulcatus (Singh) Singh, 1983 in conjunction with the absence of tricolpate pollen indicates a Barremian or possibly early Aptian age. The overlying Tebch basalt, dated by the 40Ar/39Ar laser step-heating method, yields a mid-Aptian age of 110 ± 0.52 Ma.This chronology supports the argument that the Juifotang Formation of the Jehe Group in western Liaoning is Early Cretaceous, with the Jurassic–Cretaceous boundary very low within, or below, the base of the Jehe Group. Our data also suggest that the Berriasian–Hauterivian (Neocomian) age suggested for the one known Russian locality that has yielded P. mongoliensis (Shestakovskaya Svita at Gorno-Altayaskaya, Avtonomnaya Oblast) may be excessively old.

Стилі APA, Harvard, Vancouver, ISO та ін.

8

Matthews, Wendy J., Gary J. Hampson, Bruce D. Trudgill, and John R. Underhill. "Controls on fluviolacustrine reservoir distribution and architecture in passive salt-diapir provinces: Insights from outcrop analogs." AAPG Bulletin 91, no. 10 (October 2007): 1367–403. http://dx.doi.org/10.1306/05310706123.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

9

Smedley, P. L., M. Zhang, G. Zhang, and Z. Luo. "Mobilisation of arsenic and other trace elements in fluviolacustrine aquifers of the Huhhot Basin, Inner Mongolia." Applied Geochemistry 18, no. 9 (September 2003): 1453–77. http://dx.doi.org/10.1016/s0883-2927(03)00062-3.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

10

NEWELL, ANDREW J., MICHAEL J. BENTON, TIMOTHY KEARSEY, GRAEME TAYLOR, RICHARD J. TWITCHETT, and VALENTIN P. TVERDOKHLEBOV. "Calcretes, fluviolacustrine sediments and subsidence patterns in Permo-Triassic salt-walled minibasins of the south Urals, Russia." Sedimentology 59, no. 5 (February 22, 2012): 1659–76. http://dx.doi.org/10.1111/j.1365-3091.2012.01320.x.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

11

Benton, Michael J., Andrew J. Newell, Al'bert Yu Khlyupin, Il'ya S. Shumov, Gregory D. Price, and Andrey A. Kurkin. "Preservation of exceptional vertebrate assemblages in Middle Permian fluviolacustrine mudstones of Kotel'nich, Russia: stratigraphy, sedimentology, and taphonomy." Palaeogeography, Palaeoclimatology, Palaeoecology 319-320 (February 2012): 58–83. http://dx.doi.org/10.1016/j.palaeo.2012.01.005.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

12

Bedford, C. C., J. C. Bridges, S. P. Schwenzer, R. C. Wiens, E. B. Rampe, J. Frydenvang, and P. J. Gasda. "Alteration trends and geochemical source region characteristics preserved in the fluviolacustrine sedimentary record of Gale crater, Mars." Geochimica et Cosmochimica Acta 246 (February 2019): 234–66. http://dx.doi.org/10.1016/j.gca.2018.11.031.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

13

Goren-Inbar, N., S. Belitzky, K. Verosub, E. Werker, M. Kislev, A. Heimann, I. Carmi, and A. Rosenfield. "New Discoveries at the Middle Pleistocene Acheulian Site of Gesher Benot Ya'aqov, Israel." Quaternary Research 38, no. 1 (July 1992): 117–28. http://dx.doi.org/10.1016/0033-5894(92)90034-g.

Повний текст джерела

Анотація:

AbstractThe Gesher Benot Ya'aqov archaeological site in the northern Dead Sea Rift of Israel contains Acheulian artifacts and middle Pleistocene fossils. Initial results of a new interdisciplinary study have shown that fluviolacustrine sediments of the Benot Ya'aqov Formation, which contains several archaeological occupations, were deposited in an embayment of the Hula Basin. They were subsequently deformed by tectonic activity associated with the Dead Sea Rift. Biostratigraphy, magnetostratigraphy, and K-Ar dating serve to constrain the age of the Benot Ya'aqov Formation to between 240,000 and 730,000 yr B.P. Archaeological excavation of three areas and two trenches at the new study area have produced abundant basalt, flint, and limestone artifacts, mammalian and avian fossils, and considerable plant material. The lithic materials provide an excellent opportunity to study large assemblages of in situ Acheulian artifacts, a rare phenomenon in the middle Pleistocene Levantine record. In addition, the organic materials will facilitate paleoenvironmental reconstructions from an ecological-floral perspective.

Стилі APA, Harvard, Vancouver, ISO та ін.

14

Makaske, B., E. de Vries, J. A. Tainter, and R. J. Mclntosh. "Aeolian and fluviolacustrine landforms and prehistoric human occupation on a technically influenced floodplain margin, the Méma, central Mali." Netherlands Journal of Geosciences 86, no. 3 (September 2007): 241–56. http://dx.doi.org/10.1017/s0016774600077830.

Повний текст джерела

Анотація:

AbstractThe Mema is a semi-arid region in central Mali with a rich archaeological heritage indicating the former existence of large urban settlements. The archaeological data suggest millennia of occupation history of the Méma preceding relatively sudden abandonment by the 14th or 15th century AD. Population numbers have remained low since then and today’s human presence in the area is sparse and largely mobile. Geomorphologically, the Méma can be characterized as a graben hosting various generations of aeolian landforms and (presently mostly dry) interdunal channels and lakes, linked to the neighbouring Inland Niger Delta floodplain. Given this setting, and the variability of the Sahelian climate, climatic contributions to the region’s sudden abandonment are likely. A geomorphological survey of the region, and interpretation of the observed geomorphological record in terms of climatic history, aimed at providing a basis for understanding the intensive occupation and subsequent abandonment of the Méma. The results of this study underscore dramatic Holocene climatic variability, leading to the region’s present geomorphological diversity, but also suggest that neotectonic movements constitute an important additional cause of regional desiccation. Both may have encouraged prehistoric people to abandon the Méma after a long period of occupation.

Стилі APA, Harvard, Vancouver, ISO та ін.

15

Unverfärth, Jan, Thomas Mörs, and Benjamin Bomfleur. "Palynological evidence supporting widespread synchronicity of Early Jurassic silicic volcanism throughout the Transantarctic Basin." Antarctic Science 32, no. 5 (July 7, 2020): 396–97. http://dx.doi.org/10.1017/s0954102020000346.

Повний текст джерела

Анотація:

Throughout the Transantarctic Mountains, Early Jurassic silicic magmatism preceding the emplacement of the Ferrar flood-basalt province (Heimann et al. 1994) is documented by the increasing input of silicic ash into otherwise epiclastic, fluviolacustrine deposits of the Beacon Supergroup (see Elliot et al. 2017). Vertebrate biostratigraphy and radiometric analyses indicate a Sinemurian to Pliensbachian age span for silicic volcaniclastic deposits in the central Transantarctic Mountains (CTMs) (Elliot et al. 2017). For northern Victoria Land (NVL), radiometric geochronology and palynostratigraphy revealed that explosive silicic volcanism began with minor pulses during the early Sinemurian (c. 195 Ma) and reached a peak phase beginning in the middle Pliensbachian (c. 187 Ma) (Bomfleur et al. 2014). A basin-wide correlation of these widely separated age frameworks has so far been hampered by the scarcity of data on coeval deposits in southern Victoria Land (SVL). Here, we present new palynostratigraphic data from mixed epiclastic–volcaniclastic deposits in the Prince Albert Mountains that provide supporting evidence for the widespread synchronicity of silicic volcanic episodes preceding Ferrar magmatism.

Стилі APA, Harvard, Vancouver, ISO та ін.

16

GÖZ, Ersel, Selahattin KADİR, Ali GÜREL, and Muhsin EREN. "Geology, mineralogy, geochemistry, and depositional environment of a Late Miocene/Pliocene fluviolacustrine succession, Cappadocian Volcanic Province, central Anatolia, Turkey." TURKISH JOURNAL OF EARTH SCIENCES 23 (2014): 386–411. http://dx.doi.org/10.3906/yer-1307-17.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

17

Brodzikowski, Krzysztof, Dariusz Krzyszkowski, and Antonius J. Van Loon. "Endogenic processes as a cause of penecontemporaneous soft-sediment deformations in the fluviolacustrine Czyżów Series (Kleszczów Graben, central Poland)." Geological Society, London, Special Publications 29, no. 1 (1987): 269–78. http://dx.doi.org/10.1144/gsl.sp.1987.029.01.20.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

18

RENAUT, R. W. "Zeolitic diagenesis of late Quaternary fluviolacustrine sediments and associated calcrete formation in the Lake Bogoria Basin, Kenya Rift Valley." Sedimentology 40, no. 2 (April 1993): 271–301. http://dx.doi.org/10.1111/j.1365-3091.1993.tb01764.x.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

19

Jiang, Hanchao, Junliang Ji, Ling Gao, Zihua Tang, and Zhongli Ding. "Cooling-driven climate change at 12–11 Ma: Multiproxy records from a long fluviolacustrine sequence at Guyuan, Ningxia, China." Palaeogeography, Palaeoclimatology, Palaeoecology 265, no. 1-2 (July 2008): 148–58. http://dx.doi.org/10.1016/j.palaeo.2008.05.006.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

20

Podlesnov, A. V., B. I. Morkovin, and E. N. Maschenko. "THE FEATURES OF THE GEOLOGICAL STRUCTURE AND SEDIMENTATION OF THE EARLY CRETACEOUS SITE OF THE TERRESTRIAL VERTEBRATES OF SHESTAKOVO (KEMEROVO REGION, RUSSIA)." Proceedings of higher educational establishments. Geology and Exploration, no. 2 (April 30, 2018): 13–23. http://dx.doi.org/10.32454/0016-7762-2018-2-13-23.

Повний текст джерела

Анотація:

A new data on the geological structure, conditions of formation and faunal composition of the Early Cretaceous site of the terrestrial vertebrates by Shestakovo village (Kemerovo Region, Western Siberia) has been presented.The consolidated geological section has been constructed along the line Shestakovo-1 — Shestakovo-4 — Shestakovo-3 in which five lithologic members have been identified. A distribution of the vertebrates fauna taxons has been carried out along the selected lithologic members composing the Shestakovo series of the Ilek formation. A new data obtained during fieldwork in 2017 has made it possible to distinguish two main bony levels (lithologic members 3 and 5), which contain whole skeletons of reptiles. Lithofacies analysis has shown that the formation of the sites occurred under the conditions of the fluviolacustrine plain, where the channel, delta and floodplain facies were replaced by lake and lake-marshy facies, forming a series of sedimentation cycles. The latter are the evidence of the increase in the aridization of the climate upwards along the section. The given data calls into question previously expressed point of view about the coastal-marine or lagoon genesis of the Shestakovo series.

Стилі APA, Harvard, Vancouver, ISO та ін.

21

Sepulchre, P., D. Jolly, S. Ducrocq, Y. Chaimanee, J. J. Jaeger, and A. Raillard. "Mid-Tertiary paleoenvironments in Thailand: pollen evidence." Climate of the Past 6, no. 4 (July 23, 2010): 461–73. http://dx.doi.org/10.5194/cp-6-461-2010.

Повний текст джерела

Анотація:

Abstract. Only few well-dated records document the evolution of Southeast Asian paleoenvironments during the Cenozoic. Here we analyse continental pollen assemblages from Late Oligocene and Miocene fossil sites of Thailand. In agreement with previous studies, palynoflora from the Oligocene suggests warm temperate forested habitats at 24–26 Ma, whereas Middle Miocene assemblages are made of thermophilous taxa. This change can be linked to the major climate reorganization that brought warmer and wetter conditions over Southeast Asia around 22 Ma. This study also provides the first submillional records from the Middle Miocene of Thailand. Thirteen samples of lignite layers from the sivaladapid-bearing Mae Moh site, dated between 13.3 and 13.1 Ma, and six samples from the hominoid-bearing Chiang Muan deposit, dated between 12.4 and 12.2 Ma, document oscillations between tropical woodlands and grasslands in northern Thailand. These pollen records likely reflect climate variations linked to insolation variations. Late Miocene palynological assemblages from Khorat, northeastern Thailand, document fluviolacustrine paleoenvironments alternatively covered by thermophilous trees and grasslands. These records show that both sivaladapids and early hominoids from Thailand have evolved in tropical environments with high variability in the vegetation cover.

Стилі APA, Harvard, Vancouver, ISO та ін.

22

Topal, Savaş, and Mehmet Özkul. "Soft-Sediment Deformation Structures Interpreted as Seismites in the Kolankaya Formation, Denizli Basin (SW Turkey)." Scientific World Journal 2014 (2014): 1–13. http://dx.doi.org/10.1155/2014/352654.

Повний текст джерела

Анотація:

The NW-trending Denizli basin of the SW Turkey is one of the neotectonic grabens in the Aegean extensional province. It is bounded by normal faults on both southern and northern margins. The basin is filled by Neogene and Quaternary terrestrial deposits. Late Miocene- Late Pliocene aged Kolankaya formation crops out along the NW trending Karakova uplift in the Denizli basin. It is a typical fluviolacustrine succession that thickens and coarsens upward, comprising poorly consolidated sand, gravelly sand, siltstone and marl. Various soft-sediment deformation structures occur in the formation, especially in fine- to medium grained sands, silts and marls: load structures, flame structures, clastic dikes (sand and gravely-sand dike), disturbed layers, laminated convolute beds, slumps and synsedimentary faulting. The deformation mechanism and driving force for the soft-sediment deformation are related essentially to gravitational instability, dewatering, liquefaction-liquidization, and brittle deformation. Field data and the wide lateral extent of the structures as well as regional geological data show that most of the deformation is related to seismicity and the structures are interpreted as seismites. The existence of seismites in the Kolankaya Formation is evidence for continuing tectonic activity in the study area during the Neogene and is consistent with the occurrence of the paleoearthquakes of magnitude >5.

Стилі APA, Harvard, Vancouver, ISO та ін.

23

Alves, Raquel A., and Luiza C. Beserra Neta. "Sediment Dynamics In Lacustrine Environments — Northern Amazon." GEOGRAPHY, ENVIRONMENT, SUSTAINABILITY 15, no. 3 (October 4, 2022): 61–69. http://dx.doi.org/10.24057/2071-9388-2021-094.

Повний текст джерела

Анотація:

Lakes are features found in Brazil’s northern region, commonly formed in sandy-clay layers of the Plio-Pleistocene, in a setting of the extensive flat surface, and under a high precipitation rate. Our goal in this work is to understand the sediment transport dynamic and its relation to the hydrological behavior of the regional lacustrine system. Two lakes were selected, Lago do Italiano (LIT) and Lago do Bicho (LB), situated in the municipality of Bonfim in the state of Roraima, Brazil. The lakes differ in hydrological regime, depth, and vegetation. The methodology involved bibliographical and remote sensor data and field surveys followed by laboratory processing. The results revealed that the lakes are composed of sandy materials, with layers what reach 95% of sand. The grains is medium to fine texture, with morphology angular (0 a 50%) and subangular (18% a 43%) grains, disposed at different depths. The grains’ morphology suggests that their sediment provider source is near and, at the same time, indicates a low energy environment. Concerning the mineralogical attributes, the sediments are of a quartzose nature, which permits their correlation with the arenites of the Boa Vista Formation, a sub-cropping unit. The sediment input is controlled by the seasonal oscillation of the groundwater level and inundation pulses that reach the fluviolacustrine plain of the Tacutu River in which the lakes are inserted.

Стилі APA, Harvard, Vancouver, ISO та ін.

24

Yemane, Keddy, Gunther Kahr, and Kerry Kelts. "Imprints of post-glacial climates and palaeogeography in the detrital clay mineral assemblages of an Upper Permian fluviolacustrine Gondwana deposit from northern Malawi." Palaeogeography, Palaeoclimatology, Palaeoecology 125, no. 1-4 (October 1996): 27–49. http://dx.doi.org/10.1016/s0031-0182(96)00023-5.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

25

Degeai, Jean-Philippe, and Jean-François Pastre. "Évolution morphostructurale du plateau volcano-sédimentaire de Gergovie au Miocène inférieur : implications géodynamiques sur la phase tardi-tectonique du rift de Limagne (Massif central, France)." Canadian Journal of Earth Sciences 45, no. 6 (June 2008): 641–50. http://dx.doi.org/10.1139/e08-018.

Повний текст джерела

Анотація:

The Gergovie plateau is a Lower Miocene topographically inverted volcano-sedimentary system located in the monogenetic volcanic field of the Limagne rift Tertiary basin. It is composed of three east–west aligned maars partly covered by a basaltic lava flow. The eruption of the central maar (maar 1) occurred at the Oligocene–Miocene transition, during the first volcanic phase. This phreatomagmatic structure was almost totally cut through by the opening of a second maar (maar 2) during the next eruptive phase. The basaltic lava flow at the summit and the eastern maar (maar 3) were placed during a third and last eruptive phase during the Middle or Upper Burdigalian (∼19–16 Ma). Between these periods of volcanism, three fluvial to fluviolacustrine sedimentation episodes, separated by two erosive stages, followed one another. A bedrock thickness of 100–300 m was eroded from maar 2 during the upper Aquitanian and (or) the lower Burdigalian (∼22–19 Ma). This erosion is partly due to a volcano-tectonic uplift in the southern Limagne. The complex morphostructural evolution of the Gergovie plateau demonstrates the north–south geodynamic differentiation of the Limagne rift during the Lower Miocene, since the northern part of the basin corresponded to a relatively calm lacustrine sedimentation area. More generally, the Miocene volcanic field in the South of the Limagne gives an opportunity to study interactions between volcanism, tectonics, and erosion during the late passive rifting activity phase.

Стилі APA, Harvard, Vancouver, ISO та ін.

26

Armitage, Simon J., Charlie S. Bristow, and Nick A. Drake. "West African monsoon dynamics inferred from abrupt fluctuations of Lake Mega-Chad." Proceedings of the National Academy of Sciences 112, no. 28 (June 29, 2015): 8543–48. http://dx.doi.org/10.1073/pnas.1417655112.

Повний текст джерела

Анотація:

From the deglacial period to the mid-Holocene, North Africa was characterized by much wetter conditions than today. The broad timing of this period, termed the African Humid Period, is well known. However, the rapidity of the onset and termination of the African Humid Period are contested, with strong evidence for both abrupt and gradual change. We use optically stimulated luminescence dating of dunes, shorelines, and fluviolacustrine deposits to reconstruct the fluctuations of Lake Mega-Chad, which was the largest pluvial lake in Africa. Humid conditions first occur at ∼15 ka, and by 11.5 ka, Lake Mega-Chad had reached a highstand, which persisted until 5.0 ka. Lake levels fell rapidly at ∼5 ka, indicating abrupt aridification across the entire Lake Mega-Chad Basin. This record provides strong terrestrial evidence that the African Humid Period ended abruptly, supporting the hypothesis that the African monsoon responds to insolation forcing in a markedly nonlinear manner. In addition, Lake Mega-Chad exerts strong control on global biogeochemical cycles because the northern (Bodélé) basin is currently the world’s greatest single dust source and possibly an important source of limiting nutrients for both the Amazon Basin and equatorial Atlantic. However, we demonstrate that the final desiccation of the Bodélé Basin occurred around 1 ka. Consequently, the present-day mode and scale of dust production from the Bodélé Basin cannot have occurred before 1 ka, suggesting that its role in fertilizing marine and terrestrial ecosystems is either overstated or geologically recent.

Стилі APA, Harvard, Vancouver, ISO та ін.

27

Barker, Chris T., Jeremy A. F. Lockwood, Darren Naish, Sophie Brown, Amy Hart, Ethan Tulloch, and Neil J. Gostling. "A European giant: a large spinosaurid (Dinosauria: Theropoda) from the Vectis Formation (Wealden Group, Early Cretaceous), UK." PeerJ 10 (June 9, 2022): e13543. http://dx.doi.org/10.7717/peerj.13543.

Повний текст джерела

Анотація:

Postcranial elements (cervical, sacral and caudal vertebrae, as well as ilium, rib and limb bone fragments) belonging to a gigantic tetanuran theropod were recovered from the basal unit (the White Rock Sandstone equivalent) of the Vectis Formation near Compton Chine, on the southwest coast of the Isle of Wight. These remains appear to pertain to the same individual, with enormous dimensions similar to those of the Spinosaurus holotype and exceeding those of the largest European theropods previously reported. A combination of features—including the presence of spinodiapophyseal webbing on an anterior caudal vertebra—suggest that this is a member of Spinosauridae, though a lack of convincing autapomorphies precludes the identification of a new taxon. Phylogenetic analysis supports spinosaurid affinities but we were unable to determine a more precise position within the clade weak support for a position within Spinosaurinae or an early-diverging position within Spinosauridae were found in some data runs. Bioerosion in the form of curved tubes is evident on several pieces, potentially related to harvesting behaviour by coleopteran bioeroders. This is the first spinosaurid reported from the Vectis Formation and the youngest British material referred to the clade. This Vectis Formation spinosaurid is unusual in that the majority of dinosaurs from the Lower Cretaceous units of the Wealden Supergroup are from the fluviolacustrine deposits of the underlying Barremian Wessex Formation. In contrast, the lagoonal facies of the upper Barremian–lower Aptian Vectis Formation only rarely yield dinosaur material. Our conclusions are in keeping with previous studies that emphasise western Europe as a pivotal region within spinosaurid origination and diversification.

Стилі APA, Harvard, Vancouver, ISO та ін.

28

Wainman, Carmine, and Peter McCabe. "Revisions to the chronostratigraphic framework of the Upper Jurassic Walloon Coal Measures of the Surat Basin, Australia." APPEA Journal 59, no. 2 (2019): 965. http://dx.doi.org/10.1071/aj18067.

Повний текст джерела

Анотація:

The Upper Jurassic Walloon Coal Measures (WCM) in the Surat Basin host the largest coal seam gas (CSG) resource in Australia. Despite this, a poorly defined lithostratigraphic framework hinders the development of reservoir models and groundwater flow simulations. Correlations in the WCM are challenging, owing to the complex arrangement of facies over short distances and the absence of a reliable regional stratigraphic datum. To better correlate the strata, 26 tuff beds were dated using the U–Pb chemical abrasion thermal ionisation mass spectrometry methodology across the Surat Basin CSG fairway. This initially suggested that coal-bearing strata in the basin were diachronous. However, the acquisition of a new date from the Surat Basin has identified a five million year time gap between dated tuffs ~20 m apart. This suggests the presence of an unconformity and that there were two independent episodes of coal accumulation in the basin. Above the unconformity, there are incised valleys with a sedimentary infill that transitions from fluvial- to tidal-influenced facies, as indicated by dinoflagellate cysts and tidal sedimentary structures, including double mud drapes. The cause of the unconformity is likely to be tectonic, as eustatic sea-level was rising during the Kimmeridigian. The marine incursion into the basin is the consequence of a highstand of sea-level during the early Tithonian. The application of the new chronostratigraphic framework should elucidate the evolution of fluviolacustrine systems in the basin and aid in resource prediction. Further dating of tuffs in the basin could refine the stratigraphic framework.

Стилі APA, Harvard, Vancouver, ISO та ін.

29

Wainman, Carmine, and Peter McCabe. "Re-evaluation of depositional models for the lower Permian Patchawarra Formation, Cooper Basin, South Australia: implications for petroleum exploration." APPEA Journal 60, no. 2 (2020): 794. http://dx.doi.org/10.1071/aj19207.

Повний текст джерела

Анотація:

The Late Carboniferous–Triassic Cooper Basin is Australia’s most prolific onshore petroleum province. The lower Permian Patchawarra Formation, which is up to 680 m thick and consists of up to 10% coal, is a major exploration target in the basin. Eighteen cores through the formation have been logged to re-evaluate the existing fluviolacustrine depositional model. The siliciclastics form fining- and coarsening-upward sequences that are 1–10 m thick. They are predominately fine-grained with abundant lenticular bedding, wavy bedding and thinly interlaminated siltstones and clays resembling varves. Granules and pebbles, interpreted as dropstones, are present throughout the formation. Coal beds are up to 60 m thick and rich in inertinite. Other than the coal beds, there is little evidence of the establishment of terrestrial conditions: roots are rare and there are no siliciclastic palaeosols. The siliciclastics are interpreted as the deposits of a large glaciolacustrine system, with the fining-upward successions deposited in subaqueous channels cut by hyperpycnal flows and the coarsening-upward successions deposited as overbank splays between those channels. Hyperpycnal flows may have resulted from sediment-laden cold water emanating from glacially-fed rivers, similar to those seen in many large glacial lakes in high latitudes and altitudes today. Much of the coal is interpreted as the accumulation of peats from floating mires that covered large parts of the glaciolacustrine system at certain time intervals. The high inertinite content of many coals is interpreted as the decay of organic matter within the floating mire. These new interpretations have the potential to enhance reservoir characterisation within the basin.

Стилі APA, Harvard, Vancouver, ISO та ін.

30

Jiang, Hanchao, Ning Zhong, Yanhao Li, Hongyan Xu, Xiaolin Ma, Yunfei Meng, and Xue Mao. "Magnetostratigraphy and grain size record of the Xijiadian fluviolacustrine sediments in East China and its implied stepwise enhancement of the westerly circulation during the Eocene period." Journal of Geophysical Research: Solid Earth 119, no. 10 (October 2014): 7442–57. http://dx.doi.org/10.1002/2014jb011225.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

31

Abderamane Hamit, Mahamat Nour Abdallah, Moussa Abderamane, and Mahamat Ahmat Sougoudji. "Hydrodynamic, hydrochemical and isotopic characterization of the waters of the quaternary aquifer of Bahr-El-Ghazal, north central Chad." World Journal of Advanced Research and Reviews 16, no. 2 (November 30, 2022): 794–803. http://dx.doi.org/10.30574/wjarr.2022.16.2.1147.

Повний текст джерела

Анотація:

Located in the middle of the Sahel, the study area is an integral part of the Bahr-El-Ghazal region. It is crossed by a fossil valley, which has a geological history similar to that of rivers that disappeared under the influence of climate change where evaporation phenomena were intense. From the hydrogeological point of view, the free water table of this region is housed in sedimentary geological formations of different natures. It passes from the sand tablecloth to that of the fluviolacustrine clays. In some cases, the latter confer particularly bad chemical qualities to the water, even though groundwater is the main source of drinking water for the local population. For this reason, a study aimed at understanding the different mechanisms that govern the chemical functioning of the aquifer of the Bahar-El-Ghazal region has been carried out. It is with this in mind that a piezometric study is being carried out in the first instance. This reveals the presence of some hydrodynamic anomalies. Thus, a shallow depth of the body of water is observed in the Harr and in the sandy formations of the extreme West. However, underground flows oriented from these two zones towards the central part characterize a deepening of the water level. Subsequently, a hydro-chemical study was undertaken. As regards the chemical facies, they also show an evolutionary character. They pass from calcium and magnesian bicarbonate facies to chloride or sodium and potassium sulphate facies in the piezometric depression. The values of the isotopic composition of the studied groundwater vary from -4.86 to 4.04‰ and -35.60 to 14.50‰ and delta 2H respectively.

Стилі APA, Harvard, Vancouver, ISO та ін.

32

Driese, Steven G., Zheng-Hua Li, and Sally P. Horn. "Late Pleistocene and Holocene climate and geomorphic histories as interpreted from a 23,000 14C yr B.P. paleosol and floodplain soils, southeastern West Virginia, USA." Quaternary Research 63, no. 2 (March 2005): 136–49. http://dx.doi.org/10.1016/j.yqres.2004.10.005.

Повний текст джерела

Анотація:

Field, micromorphological, pollen, whole soil (XRF), and stable isotope geochemical methods were used to evaluate the latest Pleistocene to Holocene climate record from a floodplain–terrace system in southeastern West Virginia. A late Pleistocene (22,940 ± 150 14C yr B.P.) silt paleosol with low-chroma colors formed from fluviolacustrine sediment deposited during the last glacial maximum (Wisconsinan) and records a cooler full-glacial paleoclimate. Fluvial gravel deposited between the latest Pleistocene and earliest Holocene (prior to 6360 ± 40 14C yr B.P.) was weathered in the middle Holocene under warmer, drier climate conditions, possibly correlated with the Hypsithermal and Altithermal Events of the eastern and southwestern United States, respectively. The glacial to interglacial climate shift is recorded by: (1) changes from a poorly drained landscape with fine-textured soil, characterized by high organic C and redoximorphic features related to Fe removal and concentration, to a well-drained, coarse-textured setting without gley and with significant argillic (Bt) horizon development; (2) changes from a high Zr and Ti silt-dominated parent material to locally derived, coarse fluvial gravels lower in Zr and Ti; (3) a shift from dominantly conifer and sedge pollen in the paleosol to a modern oak/hickory hardwood assemblage; and (4) a shift in δ13C values of soil organic matter from −28‰ to −24‰ PDB, suggesting an ecosystem shift from cooler, C3-dominated flora to one that was mixed C3 and C4, but still predominantly composed of C3 plants. A root-restrictive placic horizon developed between the late Pleistocene silt paleosol and the overlying fluvial gravel because of the high permeability contrast between the two textures of soil materials. This layer formed a barrier that effectively isolated the Pleistocene paleosol from later Holocene pedogenic processes.

Стилі APA, Harvard, Vancouver, ISO та ін.

33

Paudel, Mukunda Raj. "Soft sediments deformation structures: Implication for draining of Paleo-Kathmandu Lake." Journal of Nepal Geological Society 49, no. 1 (December 31, 2015): 41–48. http://dx.doi.org/10.3126/jngs.v49i1.23140.

Повний текст джерела

Анотація:

Kathmandu basin is one of the Quaternary intermontane basins in the central Nepal Himalaya. It is bounded by several faults on both southern and northern margins. The basin is filled with Plio-Pliestocene terrestrial sediments and their characteristics indicate four types of unconsolidated successions within the basin. These are before lake succession, during lake succession, draining stage lake succession and fluvial succession. Late Pleistocene aged Sunakothi Formation crops out along the southern part of the basin. It is a typical fluviolacustrine delta succession that extended from 1390 m in the southern margin to nearly 1300 m toward center of the basin. It is composed by poorly consolidated sand, gravelly sand, silt and mud beds. Various soft-sediment deformation structures occur in the formation, especially in fine- to medium –grained sands, silts and mud: load structures, flame structures, clastic dikes (sand dike), disturbed layers, convolute beds, slumps and synsedimentary faulting. The deformation mechanism and driving force for the soft-sediment deformation are related, essentially, to gravitational instability, dewatering, liquefaction and brittle deformation. Field data and the wide lateral extent of the structures as well as regional geological data show that most of the deformation is related to seismicity and the structures are interpreted as seismites. In addition, there have also been experimental studies undertaken by various authors within the different sedimentary basin. Soft-sediments deformation structure in Kathmandu basin are mainly considered to be part of the initial diagenetic changes of the sediments and include: Slump structure which occurred on the slope like delta-front area, dewatering structures which occurred by the processes of upward escape of water commonly due to loading, load structures which occurred due to density contrasts between sand and underlying wet mud. The existence of seismites in the Sunakothi Formation is evidence of continuing tectonic activity in the study area during the late Pleistocene and is a main factor for draining of the Paleo- Kathmandu lake water.

Стилі APA, Harvard, Vancouver, ISO та ін.

34

RYASHCHENKO, T. G., N. N. UKHOVA, S. I. SHTELMAKH, N. I. BELYANINA, and P. S. BELYANIN. "COMPOSITION, MICROSTRUCTURE AND PROPERTIES OF QUATERNARY CLAYS OF THE PRIKHANKAYSKAYA DEPRESSION (PRIMORYE)." Engineering Geology World 14, no. 1 (June 15, 2019): 20–34. http://dx.doi.org/10.25296/1993-5056-2019-14-1-20-34.

Повний текст джерела

Анотація:

The article considers the study results of composition, microstructure and physical-chemical properties of the quaternary clays of the Prikhankayskaya depression in district of the lake Khanka (Primorye) on the example of air-dry samples of geological borehole 45-b in the range of 18–62 m. The objective of research was to obtain new information about the properties of widespread clay sediments in this area using geologic-lithological materials and laboratory data. The schematic geologic-lithological column was composed with the selection of various zones in the quaternary clay sediments section and the border with sediments of the Neogene System. The methodological scheme of laboratory studies of clays was proposed. This scheme includes the determination of chemical and microelement composition, clay minerals, contents of carbonates, water-soluble salts, mobile forms of aluminum oxide, humus, as well as microstructural parameters (method «Microstructure») and some physical-chemical properties. Geochemical coefficients (Kz, CIA, CIW, ICV) determined the degree of chemical maturity of clays and confirmed the results of palynological studies reflecting the fluctuations of the climatic conditions of their formation. For the group of toxic microelements for the first time the special indicator (Zc) was calculated. Which was the criterion for a degree of pollution of the clay sediments section. Clay minerals of the quaternary clays are represented by smectite and hydromica. The clear change in the mineral association was found when passing to the Neogene sediments (kaolinite prevails). The method «Microstructure» revealed the aggregated type of clays microstructure, the domination of the particles of coarse dust fraction among the primary (free) particles and the almost complete absence of the particles of fine-grained sand fraction, the participation of various fractions in the composition of aggregates. The variants of the formation of certain types of aggregates (on sizes) in the fluviolacustrine «khankayskiy» clays are presented. Solid part density, water resistance (soaking time), sedimentation volume, plasticity, relative swelling (samples-pastes) were determined using standard methods for clays. By special methods, the cation exchange capacity was measured and the calculated values of the plasticity index were obtained from forecasting formulas using the yield limit. The proposed methodological scheme of complex laboratory studies of clay sediments can be recommended for problematic geologic-lithological and engineering-geological sections.

Стилі APA, Harvard, Vancouver, ISO та ін.

35

Perincek, D., and C. D. Cockshell. "THE OTWAY BASIN: EARLY CRETACEOUS RIFTING TO NEOGENE INVERSION." APPEA Journal 35, no. 1 (1995): 451. http://dx.doi.org/10.1071/aj94029.

Повний текст джерела

Анотація:

A regional seismic interpretation ot the on shore Otway Basin has been completed and used to determine the basin's structural history.Sedimentation commenced in the Tithonian-Berriasian with the deposition of the volcanogenic Casterton Formation and continued into the Berriasian-Barremian with the deposition in elongate half graben, of thick fluviolacustrine sediments of the Crayfish Group, typically thickening dramatically towards the bounding faults. The NW to W trend of Crayfish Group depocentres and their major bounding faults suggest that the initial extension direction was N-S to NE-SW in the Late Jurassic-Early Cretaceous. Dextral transtensional movement occurred along the Trumpet Fault in the west of the basin and was complemented by sinistral transtension on the major NNE striking faults of the Torquay Sub-basin in the east during this period.The dip direction of the pre-Barremian bounding faults changes a number of times along the northern margin of the basin. These changes occur across transfer/accommodation zones of complex faulting and folding, not over discrete transfer faults.Faulting and related uplift resulted in partial erosion of the Crayfish Group from a number of structural highs, prior to the Aptian. The half graben faults are overlain by Eumeralla Formation indicating that active rifting had ceased by the Aptian in the onshore Otway Basin. Further erosion occurred following post-Albian faulting and uplift prior to the Paleocene, in particular within the eastern part of the basin.During deposition of the Sherbrook Group in the Late Cretaceous, fault reactivation produced minor, shallow grabens within the older half graben systems. Major movement also continued along the Tartwaup Fault Zone, resulting in basin deepening toward the SW. This fault activity continued into the Paleocene-Early Eocene during deposition of the Wangerrip Group. In the Eocene, the Southern Ocean spreading rates changed from slow to fast, resulting in the late-Early Eocene deltaic sediment of the Upper Wangerrip Group covering some of the earlier extension faults. Compression, resulting in right-lateral wrenching and inversion of previous faults, occurred during the Miocene-Recent. Pliocene-Holocene volcanic activity occurred along zones of weakness related to these fault systems.

Стилі APA, Harvard, Vancouver, ISO та ін.

36

ΣΚΟΥΛΙΚΙΔΗΣ, Ν. Θ. "Levels and possible sources of heavy metals in surficial sediments of lake Vegoritis." Bulletin of the Geological Society of Greece 34, no. 3 (January 1, 2001): 1123. http://dx.doi.org/10.12681/bgsg.17172.

Повний текст джерела

Анотація:

Vegoritis is a large, deep, mesotrophic, typical karstic lake in ΝW Greece surrounded by mountains and Ptolemais Basin situated at its southern part. The Ptolemais Basin is subjected to the effluents of lignite mines, electric power generating plants, partly treated urban wastewaters, landfills, agricultural manufacturing units and agrochemicals from an extensively cultivated area. All these are carried into the lake through both, the atmosphere and surface runoff (Soulou River). The rock types of the mountainous part of the catchment area surrounding the lake are carbonates, acid metamorphic silicates and marble with schist and serpentinite, whereas the plain area is covered by fluviolacustrine pliocene, pleistocene and alluvial sedimentary formations. In order to identify the levels, and assess the origin of heavy metals in the surficial lake sediments 26 samples were collected using a grab sampler. Samples were analysed for their grain size, as well as for their mineral, organic matter, major element (Si02, A1203, Ti02, Fe203 , Kf>, Na20, CaO, MgO, P205, MnO, S) and heavy metal content (V, Cr, Mn, Co, Ni, Cu, Zn, As, Rb, Sr, Mo, Ba, Pb). Data were processed by multivariate statistical techniques and the main results and conclusions discussed. The heavy metals levels are low, when compared to nearly pristine lakes and normal soils. Even Cu, Pb and Zn, which are mainly derived from human activities, exhibit lower levels than in nearly pristine lakes. Only Ba, Cr, Ni and As are present in relatively high values. Ba is derived from the erosion of acid silicate rocks. Chromium originates primarily from the serpentinites and secondarily from pollution, whereas for Ni the opposite is true. The presence of As is due to fly ash deposition. The distribution of heavy metals in the lake sediments depends on lithology and pollution sources. Thus the southern part of the lake is enriched with V, Mn, Rb, Pb Fe and As from fly ash deposition. Cr, Co, Ni, Cu, Zn and Mo are derived through the Soulou R. outflow. In the northern part of the lake the weathering of acid silicate rocks contributes to the high concentrations of Ba, Rb and Sr. Considering the high anthropogenic pressure present in the area, the generally good environmental status of the lake, is attributed to its self purification potential resulting from the low retention time of the lake's water. Since As and Cr, depending on their valence state, can be considered as toxic and carcinogenic factors, a more detailed research study is suggested to be carried out.

Стилі APA, Harvard, Vancouver, ISO та ін.

37

Folharini, Saulo De Oliveira, Regina Célia de Oliveira, and André Luiz Dos Santos Furtado. "Unidades geoambientais do Parque Nacional da Restinga de Jurubatiba, litoral norte fluminense." Geography Department University of Sao Paulo 39 (June 21, 2020): 154–68. http://dx.doi.org/10.11606/rdg.v39i0.156779.

Повний текст джерела

Анотація:

Com objetivo de minimizar as intervenções humanas no ecossistema de restinga, foi instituído, em 29 de abril de 1998, o Parque Nacional (PARNA) da Restinga de Jurubatiba, localizado na faixa costeira de parte dos municípios de Macaé e Quissamã e em toda a faixa costeira do município de Carapebus, no Estado do Rio de Janeiro. Neste cenário, o estudo da paisagem fundamentado na abordagem sistêmica e geoecológica mostra-se um importante instrumento de análise, e embasa estudos de ordenamento territorial e planejamento ambiental. O presente estudo teve como objetivo delimitar e caracterizar Unidades Geoambientais do PARNA da Restinga de Jurubatiba e sua zona de amortecimento terrestre. As etapas de desenvolvimento consideraram a base de dados físicos e antrópicos, formada pelos componentes Formações Geológicas, Compartimentos Geomorfológicos, Classes de Solo, Precipitação e Cobertura da Terra e Uso. Correlacionados, resultaram na delimitação das seguintes Unidades Geoambientais: Colinas altas, Colinas altas dissecadas, Colinas baixas, Colinas baixas dissecadas, Planície lacustre, Planície fluviolacustre, Planície marinha, Planície fluviomarinha, Complexo de lagoas paralelas à costa, Área de inundação e Praia. Ainda como forma de caracterizar a paisagem, foram definidas as funções geoecológicas das Unidades Geoambientais em áreas emissoras, transmissoras e receptoras de matéria e energia. Ao considerar o funcionamento sistêmico, a abordagem de análise geoecológica empregada resultou na delimitação de Unidades Geoambientais que refletem a evolução da paisagem, e o Mapa de Unidades Geoambientais pode ser aplicado na gestão territorial da Unidade de Conservação.

Стилі APA, Harvard, Vancouver, ISO та ін.

38

Tenuta, Mariano, Paola Donato, Rocco Dominici, and Rosanna De Rosa. "The influence of volcanic supply on the composition of modern river sands: the case study of the Ofanto River, southern Italy." Geological Society, London, Special Publications, October 5, 2021, SP520–2021–89. http://dx.doi.org/10.1144/sp520-2021-89.

Повний текст джерела

Анотація:

AbstractThe Ofanto River drains volcanic rocks from the Monte Vulture, lacustrine–fluviolacustrine deposits associated with the same volcano and sedimentary deposits of the Southern Apennines and the Bradanic foredeep sequences. Comparing the modal composition of river sands and the outcrop area of different lithologies in the different sub-basins, an over-concentration of the volcaniclastic fraction, mainly represented by loose crystals of clinopyroxene, garnet and amphibole, is shown. This has been related to the preferential erosion of pyroclastic deposits, characterized by high production of sand-sized loose minerals, together with the carbonate lability and the low sand-sized detritus production from claystones and marls. The occurrence of volcaniclastic components upstream of Monte Vulture can be explained as a contribution from the lacustrine–fluviolacustrine deposits cropping out in the upstream sector or from pyroclastic fall deposits of Monte Vulture and/or Campanian volcanoes. This research shows that the volcanic record in the fluvial sands of the Ofanto River comes from weathering and sorting processes of volcaniclastic deposits rather than of the lavas building the main edifice. Therefore, caution must be taken during palaeoenvironmental and palaeoclimatic reconstructions when relating the type and abundance of the volcanic component in sediments to the weathering stage and evolutionary history of the volcano.

Стилі APA, Harvard, Vancouver, ISO та ін.

39

Tenuta, Mariano, Paola Donato, Rocco Dominici, and Rosanna De Rosa. "The influence of volcanic supply on the composition of modern river sands: the case study of the Ofanto River, southern Italy." Geological Society, London, Special Publications, October 5, 2021, SP520–2021–89. http://dx.doi.org/10.1144/sp520-2021-89.

Повний текст джерела

Анотація:

AbstractThe Ofanto River drains volcanic rocks from the Monte Vulture, lacustrine–fluviolacustrine deposits associated with the same volcano and sedimentary deposits of the Southern Apennines and the Bradanic foredeep sequences. Comparing the modal composition of river sands and the outcrop area of different lithologies in the different sub-basins, an over-concentration of the volcaniclastic fraction, mainly represented by loose crystals of clinopyroxene, garnet and amphibole, is shown. This has been related to the preferential erosion of pyroclastic deposits, characterized by high production of sand-sized loose minerals, together with the carbonate lability and the low sand-sized detritus production from claystones and marls. The occurrence of volcaniclastic components upstream of Monte Vulture can be explained as a contribution from the lacustrine–fluviolacustrine deposits cropping out in the upstream sector or from pyroclastic fall deposits of Monte Vulture and/or Campanian volcanoes. This research shows that the volcanic record in the fluvial sands of the Ofanto River comes from weathering and sorting processes of volcaniclastic deposits rather than of the lavas building the main edifice. Therefore, caution must be taken during palaeoenvironmental and palaeoclimatic reconstructions when relating the type and abundance of the volcanic component in sediments to the weathering stage and evolutionary history of the volcano.

Стилі APA, Harvard, Vancouver, ISO та ін.

40

Ibrahim Turkmen1. "ABSTRACT: Fluviolacustrine-Palustrine Deposits of The Pliocene Çaybagi Formation, Eastern Turkey." AAPG Bulletin 85 (2001). http://dx.doi.org/10.1306/61eed2b0-173e-11d7-8645000102c1865d.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

41

Basavaiah, N., E. Appel, B. V. Lakshmi, K. Deenadayalan, K. V. V. Satyanarayana, Saumitra Misra, N. Juyal, and M. A. Malik. "Revised magnetostratigraphy and characteristics of the fluviolacustrine sedimentation of the Kashmir basin, India, during Pliocene-Pleistocene." Journal of Geophysical Research 115, B8 (August 24, 2010). http://dx.doi.org/10.1029/2009jb006858.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

42

Stephen F. Greb. "Fluviolacustrine Deposition in Hazard No. 8 to Hazard No. 8 Rider Seam Interval, Breathitt Formation (Pennsylvanian), Eastern Kentucky: ABSTRACT." AAPG Bulletin 72 (1988). http://dx.doi.org/10.1306/703c91d1-1707-11d7-8645000102c1865d.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

43

Zhang, Qian, Enpu Gong, Yongli Zhang, and Changqing Guan. "Early Jurassic (Toarcian) warming identified from lacustrine sediments of eastern Liaoning, China." Geological Magazine, November 20, 2020, 1–15. http://dx.doi.org/10.1017/s0016756820001235.

Повний текст джерела

Анотація:

Abstract This study focuses on the Tianshifu Basin, eastern Liaoning, China, which is filled with Lower–Middle Jurassic fluviolacustrine sediments rich in macroplants. Our aim is to explore the continental climate features of the late Early Jurassic period. The composition of the Early–Middle Jurassic flora and the carbon isotopic ratios of organic matter, total organic carbon, total organic nitrogen and sulphur of the rock samples from the Changliangzi section (the upper part of the Lower Jurassic deposits) have been investigated. Based on the flora, eastern Liaoning was generally characterized by temperate and humid conditions during the Early–Middle Jurassic period, but with rising temperatures during late Early Jurassic time. The sediments of the Changliangzi section show a transformation from shallow-lake facies to deep-lake facies. A positive organic carbon isotope excursion correlates with the deepening of this palaeolake, considered to be caused by climate warming. The late Early Jurassic climate warming indicated by floral and isotopic evidence corresponds to the climatic events recorded elsewhere in marine and continental sequences during the Toarcian Age, the so-called Toarcian Anoxic event, and may be associated with enhanced global greenhouse warming. This study provides new continental data supporting global warming during the late Early Jurassic period.

Стилі APA, Harvard, Vancouver, ISO та ін.

44

"Imprints of post-glacial climates and palaeogeography in the detrital clay mineral assemblages of an Upper Permian fluviolacustrine Gondwana deposit from northern Malawi." Journal of African Earth Sciences 26, no. 2 (February 1998): IV. http://dx.doi.org/10.1016/s0899-5362(97)83508-7.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

45

Chellat, Smaine. "Some problems of the application of the U–Th series and radiocarbon absolute dating techniques to Quaternary fluviolacustrine deposits in the Morsott commune of Algeria." Archaeological and Anthropological Sciences 13, no. 5 (April 8, 2021). http://dx.doi.org/10.1007/s12520-021-01319-y.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

46

Brownstein, Chase Doran. "High morphological disparity in a bizarre Paleocene fauna of predatory freshwater reptiles." BMC Ecology and Evolution 22, no. 1 (March 21, 2022). http://dx.doi.org/10.1186/s12862-022-01985-z.

Повний текст джерела

Анотація:

Abstract Background The consequences of the K-Pg mass extinction are reflected across present biodiversity, but many faunas that appeared immediately after the extinction event were very different from current ones. Choristodera is a clade of reptiles of uncertain phylogenetic placement that have an extremely poor fossil record throughout their 150-million-year history. Yet, choristoderes survived the K-Pg event and persisted until the Miocene. Results I describe the skulls and skeletons of two new choristoderes from a single Paleocene ecosystem in western North America that reveal the hidden Cenozoic diversity of this reptile clade. Despite their similar size, the new species deviate dramatically in morphology. Kosmodraco magnicornis gen. et sp. nov. possesses an extremely short snout and extensive cranial ornamentation. The sacrum of K. magnicornis bears enlarged muscle attachment sites and other modifications reminiscent of some giant crocodylians. In contrast, Champsosaurus norelli sp. nov. is a longirostrine species with an uninflated and ventrally divergent postorbital skull. Together with a North American choristodere previously classified in the European genus Simoedosaurus, K. magnicornis substantiates a new clade of giant, short-snouted taxa endemic to the Americas. C. norelli is found to be an early-diverging member of the genus Champsosaurus from the Cretaceous-Paleogene of the northern hemisphere. This suggests the presence of several ghost lineages of champsosaurid that crossed the K-Pg boundary. Conclusions The new taxa greatly increase Cenozoic choristodere richness and strengthen the evidence for the existence of distinctive freshwater faunas in Paleogene Eurasia and North America, where this clade diversified to exploit newly available macropredatory niches in the aftermath of the asteroid impact. The new choristoderes also reveal the distinct ecological context in which extant freshwater predators of the Americas like alligatoroids and gars have their origins: Paleocene fluviolacustrine ecosystems in North America displayed high large predator diversity and morphological disparity relative to modern ones.

Стилі APA, Harvard, Vancouver, ISO та ін.

47

Wang, Huiying, Ping Wang, Gang Hu, Renmao Yuan, Yukui Ge, Bo Xu, and Lingfan Shi. "Impact of extreme debris flow-induced paleodamming events on the sedimentological evolution of the middle Yarlung Tsangpo River reaches since the late Pleistocene, Tibet." Frontiers in Earth Science 10 (January 19, 2023). http://dx.doi.org/10.3389/feart.2022.1017858.

Повний текст джерела

Анотація:

As extreme surface processes, long-term river damming and outburst events can impact sediment supply and transportation in valleys and therefore significantly change the landscape. Lacustrine sediments were identified in the wide Xigaze Valley, in the middle reaches of the Yarlung Tsangpo River in Tibet, an area which has been considered to have been a paleodammed lake. However, the evolutionary process and damming mechanisms associated with this paleolake, and any subsequent impact on sedimentation within the valley, remain unclear. Here, we present a detailed geomorphological and sedimentary analysis of the proposed paleolake area, based on a study of a prominent valley fill found along a section of the Yarlung Tsangpo River and its tributary that flows into it from the south, the Menchu River. This section stretches from Xigaze to Dazhuka. Sedimentary facies analysis of two stratigraphic sections in Renbu Town showed that at least two paleolakes caused by debris flow related to glaciers developed in the Xigaze Valley and that the paleodam was located near the outlet of the Dazhuka Gorge. Chronological constraints suggest that the first damming event occurred between ∼48.6 and 33.7 ka in Marine Isotope Stage (MIS) 3 and had a minimum lake surface elevation of ∼3,820 m. The second damming occurred between ∼24.3 and 12.7 ka during the Last Glacial Maximum (LGM), producing a lake surface elevation of at least ∼3,760 m. During the development of the paleolakes in the Xigaze Valley, several small-scale damming and outburst events happened in the upper and middle reaches of the Menchu River, resulting in fluviolacustrine and outburst flood sediments accumulating in the main stream of the Yarlung Tsangpo River and forming thick-fill terraces. We presumed that the paleolakes in the middle reaches of the Yarlung Tsangpo River gradually drained as a result of continuous overflow undercutting instead of outburst flood events, thereby allowing fluvial aggradation of the upper reaches of the paleodam.

Стилі APA, Harvard, Vancouver, ISO та ін.

Статті в журналах з теми "Fluviolacustrine"

Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями