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Добірка наукової літератури з теми "Basement inlier"

Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 29 січня 2023

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Статті в журналах з теми "Basement inlier"

Heaman, L. M., Philippe Erdmer, and J. V. Owen. "U–Pb geochronologic constraints on the crustal evolution of the Long Range Inlier, Newfoundland." Canadian Journal of Earth Sciences 39, no. 5 (May 1, 2002): 845–65. http://dx.doi.org/10.1139/e02-015.

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The Long Range Mountains of Newfoundland expose the northeastern most basement inlier of the Appalachian Orogen. UPb results for two samples of basement gneiss reveal crustal formation ages of 1466 ± 10 Ma (Western Brook Pond charnockite) and 1530 ± 8 Ma (Cat Arm Road gneiss), indicating an affinity with Pinwarian magmatism (15101450 Ma) in Labrador. A third sample of basement gneiss from the Cat Arm Road dam site yielded a minimum formation age of 1631 Ma. These basement gneisses were intruded by granite plutons during two periods of Grenvillian magmatism; Group I at 10321022 Ma and Group II at 993985 Ma. Group I intrusions include the 1032.0 ± 1.5 Ma Lomond River granite and the 1022.0 ± 2.0 Ma Lake Michel igneous suite; Group II intrusions include the 999 ± 4 Ma Potato Hill charnockite, 993 ± 7 Ma Horse Chops granite, 984.9 ± 1.6 Ma Cloud River granite, and may include the Apsy granite. The metamorphic history of the Long Range Inlier is complex and three discrete Proterozoic metamorphic events can be delineated on the basis of field relationships and UPb dates for metamorphic minerals. M1 metamorphism is a regional high-grade event that occurred prior to 1032 Ma, the emplacement age for the unmetamorphosed Lomond River granite. M2 and M3 occurred at 1022 and 989 Ma, respectively; coinciding with the two main periods of Grenvillian magmatism. The Precambrian crustal evolution of the Long Range Inlier is very similar to the Pinware terrane of Labrador, consistent with a single contiguous terrane presently separated by the Gulf of St. Lawrence. A surprising discovery from this study is identification of the first known occurrence of Silurian mafic magmatism in the Long Range Inlier, the 430.5 ± 2.5 Ma Taylor Brook gabbro.

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ALESSIO, BRANDON L., MORGAN L. BLADES, GEORGE MURRAY, BENJAMIN THORPE, ALAN S. COLLINS, DAVID E. KELSEY, JOHN FODEN, JUSTIN PAYNE, SALAH AL-KHIRBASH, and FRED JOURDAN. "Origin and tectonic evolution of the NE basement of Oman: a window into the Neoproterozoic accretionary growth of India?" Geological Magazine 155, no. 5 (March 7, 2017): 1150–74. http://dx.doi.org/10.1017/s0016756817000061.

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AbstractThe Omani basement is located spatially distant from the dominantly juvenile Arabian–Nubian Shield (ANS) to its west, and its relationship to the amalgamation of those arc terranes has yet to be properly constrained. The Jebel Ja'alan (NE Oman) basement inlier provides an excellent opportunity to better understand the Neoproterozoic tectonic geography of Oman and its relationship to the ANS. To understand the origin of this basement inlier, we present new radiogenic isotopic data from igneous bodies in Jebel Ja'alan. U–Pb and 40Ar/39Ar geochronological data are used to constrain the timing of magmatism and metamorphism in the jebel. Positive εHf and εNd values indicate a juvenile origin for the igneous lithologies. Phase equilibria modelling is used to constrain the metamorphic conditions recorded by basement. Pressure–temperature (P–T) pseudosections show that basement schists followed a clockwise P–T path, reaching peak metamorphic conditions of c. 650–700°C at 4–7.5 kbar, corresponding to a thermal gradient of c. 90–160°C/kbar. From the calculated thermal gradient, in conjunction with collected trace-element data, we interpret that the Jebel Ja'alan basement formed in an arc environment. Geochronological data indicate that this juvenile arc formed during Tonian time and is older than basement further west in Oman. We argue that the difference in timing is related to westwards arc accretion and migration, which implies that the Omani basement represents its own tectonic domain separate to the ANS and may be the leading edge of the Neoproterozoic accretionary margin of India.

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Cooper, A. H., and S. G. Molyneux. "The age and correlation of Skiddaw Group (early Ordovician) sediments in the Cross Fell inlier (northern England)." Geological Magazine 127, no. 2 (March 1990): 147–57. http://dx.doi.org/10.1017/s0016756800013832.

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AbstractThe Skiddaw Group in the Cross Fell inlier comprises the Catterpallot Formation of latest Tremadoc or earliest Arenig age, the Murton Formation of Arenig age, and the Kirkland Formation of early Llanvirn age. Each of these formations can be correlated with formations in the Skiddaw Group of the Lake District. The faulted contact of the Catterpallot and Kirkland formations is the probable extension of the Causey Pike Fault (CPF), which separates two distinct sequences in the Skiddaw inlier of the northern Lake District. Contrasts across the CPF in the Cross Fell inlier reflect those seen in the Skiddaw inlier. The CPF is a major basement structure, separating markedly different successions in the Ordovician strata of northern England.

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Didenko, A. N., I. K. Kozakov, and A. V. Dvorova. "Paleomagnetism of granites from the Angara-Kan basement inlier, Siberian craton." Russian Geology and Geophysics 50, no. 1 (January 2009): 57–62. http://dx.doi.org/10.1016/j.rgg.2008.04.008.

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Van Baelen, Hervé, and Manuel Sintubin. "Kinematic consequences of an angular unconformity in simple shear: an example from the southern border of the Lower Palaeozoic Rocroi inlier (Naux, France)." Bulletin de la Société Géologique de France 179, no. 1 (January 1, 2008): 73–87. http://dx.doi.org/10.2113/gssgfbull.179.1.73.

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AbstractThe presence of an angular unconformity in combination with complex structures in the basement, lacking in the cover, is commonly seen as an indication for an orogenic event pre-dating the unconformity. The recognition of such an older orogenic event becomes, however, less evident in areas where both cover and basement were deformed together during an orogen post-dating the angular unconformity.The validity of this common interpretation has been evaluated at the southern border of the Lower Palaeozoic Rocroi basement inlier (Naux, northern France), where the basement-cover interface is very well exposed. This basement-cover interface, showing an angular unconformity, has classically been interpreted as evidence for an early Palaeozoic tectonometamorphic event, called the Ardennian orogeny, though only one penetrative cleavage, co-genetic with the structures present in both cover and basement, can be observed.A detailed geometrical study shows, however, that the presence of a tilted basement, involving the angular unconformity, provokes a rheological heterogeneity that causes a contrasting response of basement and cover with respect to the Variscan shortening. While Variscan progressive deformation gave rise to a rather regular cleavage refraction pattern in the subhorizontal multilayer cover sequence, a complex deformation, expressed by non-cylindrical folds, boudinage and shearing developed in the basement. The basement-cover interface itself played no rheological role, but has been passively sheared and folded as a consequence of the deformation of the basement. This study proves that the deformed basement-cover interface, allowing to link deformation in basement and cover, is a necessary tool to properly interpret complex deformation in the basement. With respect to the regional geodynamic evolution of the northern parts of the Central European Variscides, our kinematic model indeed demonstrates that this classical outcrop area bears no evidence for an early Palaeozoic orogenic event, and that the angular unconformity reflects the late Silurian – early Devonian onset of the Ardenne-Eifel basin development, rather than a middle Ordovician Ardennian orogeny.

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Skourtsos, E., H. Kranis, A. Zambetakis-Lekkas, R. Gawthorpe, and M. Leeder. "ALPINE BASEMENT OUTCROPS AT NORTHERN PELOPONNESUS: IMPLICATIONS FOR THE EARLY STAGES IN THE EVOLUTION OF THE CORINTH RIFT." Bulletin of the Geological Society of Greece 50, no. 1 (July 27, 2017): 153. http://dx.doi.org/10.12681/bgsg.11714.

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We focus on the central and eastern southern onshore parts of the Corinth Rift (CR), where basement outcrops are few and of limited extent, to study three key locations: a basement inlier east of Xylokastro, a new outcrop of the Tripolis Unit at the western edge of the Xylokastro horst, and a re-mapped and re-evaluated outcrop of the Pindos Unit northwest of Nemea. The results of this study show that there are elements which could help overcome the significant difficulties in our understanding of the structure and evolution of the rift, posed by the lack of basement outcrops in the central and eastern onshore parts of the Rift. This, in turn, calls for a reconsideration of the generally accepted idea that the broader onshore eastern sector of the CR lacks significant basement and intrabasinal faults.

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Becker, T. "The petrogenesis of the Alberta Complex within the Rehoboth Basement Inlier of Namibia." South African Journal of Geology 105, no. 2 (June 1, 2002): 147–62. http://dx.doi.org/10.2113/105.2.147.

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Hicks, N., D. J. C. Gold, M. Ncume, and L. Hoyer. "A new lithostratigraphic framework and unified nomenclature for the Nsuze Group of the Nkandla sub-basin, southern Kaapvaal Craton, South Africa." South African Journal of Geology 124, no. 3 (September 1, 2021): 699–716. http://dx.doi.org/10.25131/sajg.124.0027.

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Abstract During the early 20th century the term Insuzi Series, later reclassified as the Nsuze Group of the Pongola Supergroup, was proposed for a volcano-sedimentary succession exposed in the upper Nsuze River valley in central KwaZulu-Natal, South Africa. Subsequently, however, there has been little consensus on lithostratigraphic frameworks within the type area, and limited correlation with the exceptionally well-defined stratigraphy within the main Pongola basin. Recent mapping, combined with newly acquired high-resolution aeromagnetic data, satellite imagery, and available published geochronological data suggest that previously published schemes within the Nkandla sub-basin require revision. Utilising important regional marker units, as well as the stratigraphic positions of distinct sedimentary facies within the otherwise volcanic Nsuze Group, a working model is proposed. Lithostratigraphic units are well represented in the Mhlatuze and Nkandla inliers with examples from these areas given prominence. Where exposed, potential correlates within the Nsuze nappe complex are discussed. Within the proposed scheme the siliciclastic Mantonga Formation forms the base of the Nsuze Group, nonconformably overlying basement granitoids of the Kaapvaal Craton within the Mhaltuze Inlier. Mafic volcanics of the Nhlebela Formation overlie the Mantonga Formation in the inlier. These two lower units are, however, not exposed elsewhere in the sub-basin. The sedimentary White Mfolozi Formation forms the base of the succession in the Nkandla Inlier. Diamictites and stromatolite-bearing carbonate lithologies unique to this unit are utilised for regional third-order correlations with the type-area in the White Mfolozi Inlier. Mafic volcanics of the Agatha Formation overlie the White Mfolozi Formation in all exposures, but are most extensively developed within the Mdlelanga syncline of the Nkandla Inlier. Sedimentary and volcaniclastic lithologies of the Mkuzane Formation cap the Nsuze Group in the Mhlatuze and Nkandla inliers. Thickness of this formation is, however, highly variable having been subjected to pre-Vutshini Formation erosion. Through detailed reinterpretation of the stratigraphy of the Nkandla sub-basin we present a third order, (formation) scale, lithostratigraphic scheme encompassing all the formational units of the currently accepted stratigraphy within the main Pongola basin. This working model has the potential for lower-ranking units to be identified and be placed at their appropriate stratigraphic levels in future.

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Hofmann, A., H. Xie, L. Saha, and C. Reinke. "Granitoids and greenstones of the White Mfolozi Inlier, south-east Kaapvaal Craton." South African Journal of Geology 123, no. 3 (September 1, 2020): 263–76. http://dx.doi.org/10.25131/sajg.123.0019.

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Abstract A Palaeoarchaean greenstone fragment and associated granitoid gneisses from an area south of Ulundi in KwaZulu-Natal is described. The fragment consists of an association of garnetiferous amphibolite and calc-silicate that was intruded at 3388 ± 4 Ma by tonalite and at 3275 ± 4 Ma by trondhjemite. Strong ductile deformation of the greenstones and granitoids under amphibolite facies conditions (7 kbar and 600 to 650°C) took place prior to uplift and emplacement of a granite batholith at ~3.25 Ga ago in which the granitoid gneiss-greenstone domain is now found. Magmatism 3.27 to 3.25 Ga ago was a direct response to regional metamorphism and anataxis, and gave rise to stabilization of the southeastern Kaapvaal Craton at that time, earlier than other parts of the craton. Deposition of quartz-arenites on stable granitic basement took place <3.1 Ga ago. Contrasting ages in magmatic pulses and regional metamorphism reflect a different crustal growth history of the eastern and southeastern part of the Kaapvaal Craton.

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McConachie, B. A., M. G. Barlow, J. N. Dunster, R. A. Meaney, and A. O. Schaap. "THE MOUNT ISA BASIN—DEFINITION, STRUCTURE AND PETROLEUM GEOLOGY." APPEA Journal 33, no. 1 (1993): 237. http://dx.doi.org/10.1071/aj92018.

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The Mount Isa Basin is a new concept to describe the area of Palaeo- to Mesoproterozoic rocks south of the Murphy Inlier (not the Murphy Tectonic Ridge) and inappropriately described as the Mount Isa Inlier. The new basin concept presented in this paper allows the characterisation of basin-wide structural deformation and the recognition of areas with petroleum exploration potential.The northern depositional margin of the Mount Isa Basin is the metamorphic, intrusive and volcanic complex referred to as the Murphy Inlier. The eastern, southern and western boundaries of the basin are obscured by younger basins (Carpentaria, Eromanga and Georgina Basins). The Murphy Inlier rocks comprise the seismic basement to the Mount Isa Basin sequence. Evidence for the continuity of the Mount Isa Basin with the McArthur Basin to the northwest and the Willyama Block (Basin) at Broken Hill to the south is presented. These areas combined with several other areas of similar age are believed to have comprised the Carpentarian Superbasin.The application of seismic exploration within Authority to Prospect (ATP) 423P at the northern margin of the basin was critical to the recognition and definition of the Mount Isa Basin. The northern Mount Isa Basin is structurally analogous to the Palaeozoic Arkoma Basin of Oklahoma and Arkansas in the southern USA but as with all basins it contains unique characteristics, a function of its individual development history. The northern Mount Isa Basin is defined as the basin area northwest of the Mount Gordon Fault.

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Дисертації з теми "Basement inlier"

Crowhurst, P. V. "The geology, petrology and geochemistry of the Proterozoic inlier, south of Myponga, Fleurieu Peninsula, South Australia." Thesis, 1988. http://hdl.handle.net/2440/119710.

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This item is only available electronically.
The study area is located within the Yankalilla-Myponga Proterozoic lnlier, approximately 60km south of Adelaide. The basement rocks are comprised of a mixture of metasediments and intrusives. The metasediments predominantly comprise of quartz-biotite gneisses and schists. They are intruded by basic dykes, pegmatites and an aplite/microgranite. The basic dykes have oceanic basalt affinities and could originally have been formed during an 'aborted rifting' event, but the more felsic rocks are more likely to lie within plate granites. The origin of the 'Houghton' granulite is difficult to ascertain, because it has a varied internal composition and is closely comparable to a diorite and a shale. The basement inlier rocks are found within the overlying unconformable upper Proterozoic Adelaidean System. They have undergone at least four phases of deformation and metamorphism. Mineral assemblages found in the rocks indicate metamorphism reached at least upper amphibolite facies. The maximum pressure and temperature conditions were calculated from microprobe data. They range from 8-10 kb at 550 -650 C. U-Pb isochron dating was performed on the aplite/microgranite of the area and was found to be 1578+\-22Ma ,which places a minimum age on the inlier rocks. This date obtained and the deformation processes recognized are comparable to other basement rocks in South Australia; noticeably the Gaw1er Craton and the Olary Province. This may indicate a homogeneous terrain once spanned most of South Australia during the lower Proterozoic.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 1988

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Книги з теми "Basement inlier"

Ziegler, U. R. F. Age determinations in the Rehoboth Basement Inlier, Namibia. Windhoek, Namibia: Geological Survey of Namibia, Ministry of Mines and Energy, 1993.

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Частини книг з теми "Basement inlier"

Daly, J. Stephen, David M. Chew, Michael J. Flowerdew, Julian F. Menuge, Rose Fitzgerald, Claire A. McAteer, and Ray Scanlon. "The Basement and Dalradian Rocks of the North Mayo Inlier." In A Field Guide to the Geology of Western Ireland, 9–72. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-97479-4_2.

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Martens, Uwe C., and Roberto S. Molina Garza. "Mexico: Basement framework and pre-Cretaceous stratigraphy." In Southern and Central Mexico: Basement Framework, Tectonic Evolution, and Provenance of Mesozoic–Cenozoic Basins, 1–27. Geological Society of America, 2021. http://dx.doi.org/10.1130/2021.2546(01).

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ABSTRACT Provenance determinations of sediment deposited in circum–Gulf of Mexico basins rely on understanding the geologic elements present in the basement provinces located from northeast Mexico to Honduras. Relevant geologic features of these provinces are herein summarized in text and pictorial form, and they include the Huizachal-Peregrina uplift, western Gulf of Mexico, Huayacocotla, Zapoteco, Mixteca, Xolapa, Juchatengo, Cuicateco, Mixtequita, south-central Chiapas, southeast Chiapas, western Guatemala, central Guatemala, Maya Mountains, and the Chortis block. We recognized basement elements of local character that serve as fingerprints for specific source areas. However, many elements are ubiquitous, such as 1.4–0.9 Ga, high-grade metamorphic rocks that occur both as broad exposures and as inliers in otherwise reworked crust. Xenocrystic and detrital zircon of Mesoproterozoic age is very common and hence not diagnostic of provenance. Neoproterozoic rocks are very scarce in Mexican basement provinces. However, Ediacaran–Cambrian detrital zircon grains are found in Mexican Paleozoic strata; these were possibly derived from distant sources in Gondwana and Pangea. Ordovician–Silurian magmatism is present in approximately half the provinces; magmatic detrital zircon of such age is somewhat informative in terms of provenance. More useful populations are detrital zircon grains with Ordovician–Silurian metamorphic overgrowth, which seem to be mainly sourced from the Mixteca region or the southern Chiapas Massif. Devonian basement has only been discovered in the Maya Mountains of Belize, and detrital zircon of such age seems to be characteristic of that source. A similar case can be made about Carboniferous zircon and the Acatlán Complex, Middle Pennsylvanian zircon and Juchatengo plutons, and Late Triassic zircon and the basement exposed in central Guatemala. In all these cases, the age and geographic extent of the zircon source are restricted and serve as a distinct fingerprint. Plutons of Permian–Early Triassic age are widespread, and detrital zircon grains from them are rather nonspecific indicators of source area. Future dating of detrital white mica using 40Ar-39Ar could help in recognizing Carboniferous–Triassic schist from more restricted schist occurrences such as west Cuicateco (Early Cretaceous) and central Guatemala (Late Cretaceous).

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Richter, Axel, and Heinz Schandelmeier. "Precambrian basement inliers of Western Desert geology, petrology and structural evolution." In The Geology of Egypt, 185–200. Routledge, 2017. http://dx.doi.org/10.1201/9780203736678-11.

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Тези доповідей конференцій з теми "Basement inlier"

Gregory, Robert T. "PRECAMBRIAN BASEMENT PENETRATING PALEOZOIC NORMAL FAULTS IN THE LLANO INLIER AS ANALOGS FOR FAULTS REACTIVATED BY OIL AND GAS ACTIVITIES IN THE FORT WORTH BASIN." In 54th Annual GSA South-Central Section Meeting 2020. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020sc-343835.

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Osukuku, Godfred, Abiud Masinde, Bernard Adero, Edmond Wanjala, and John Ego. "Integrated Geophysical Interpretation of Kerio Valley Basin Stratigraphy, Kenya Rift." In SPE/AAPG Africa Energy and Technology Conference. SPE, 2016. http://dx.doi.org/10.2118/afrc-2670415-ms.

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Abstract This research work attempts to map out the stratigraphic sequence of the Kerio Valley Basin using magnetic, gravity and seismic data sets. Regional gravity data consisting of isotactic, free-air and Bouguer anomaly grids were obtained from the International Gravity Bureau (BGI). Magnetic data sets were sourced from the Earth Magnetic Anomaly grid (EMAG2). The seismic reflection data was acquired in 1989 using a vibrating source shot into inline geophones. Gravity Isostacy data shows low gravity anomalies that depict a deeper basement. Magnetic tilt and seismic profiles show sediment thickness of 2.5-3.5 Km above the basement. The Kerio Valley Basin towards the western side is underlain by a deeper basement which are overlain by succession of sandstones/shales and volcanoes. At the very top are the mid Miocene phonolites (Uasin Gishu) underlain by mid Miocene sandstones/shales (Tambach Formation). There are high gravity anomalies in the western and southern parts of the basin with the sedimentation being constrained by two normal faults. The Kerio Valley Basin is bounded to the west by the North-South easterly dipping fault system. Gravity data was significantly of help in delineating the basement, scanning the lithosphere and the upper mantle according to the relative densities. The basement rocks as well as the upper cover of volcanoes have distinctively higher densities than the infilled sedimentary sections within the basin. From the seismic profiles, the frequency of the shaley rocks and compact sandstones increases with depths. The western side of the basin is characterized by the absence of reflections and relatively higher frequency content. The termination of reflectors and the westward dip of reflectors represent a fault (Elgeyo fault). The reflectors dip towards the west, marking the basin as an asymmetrical syncline, indicating that the extension was towards the east. The basin floor is characterized by a nearly vertical fault which runs parallel to the Elgeyo fault. The seismic reflectors show marked discontinuities which may be due to lava flows. The deepest reflector shows deep sedimentation in the basin and is in reasonable agreement with basement depths delineated from potential methods (gravity and magnetic). Basement rocks are deeper at the top of the uplift footwall of the Elgeyo Escarpment. The sediments are likely of a thickness of about 800 M which is an interbed of sandstones and shales above the basement.

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Chen, Bin. "Core-Catcher Coolability Analysis With Coupled THEMA and RELAP Codes." In 16th International Conference on Nuclear Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/icone16-48624.

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Core-catcher concept is widely used as a mitigation measure for containment protection under severe accident condition. Preliminary design of core-catcher is combined with ex-vessel corium behavior and corium cooling. The loose coupling of THEMA and RELAP codes provides a convenient method to evaluation the coolability of core catcher with a realistic ex-vessel corium characteristic by couple the corium and concrete basemat parameters like spreading area heat flux and etc. calculated by THEMA code and thermal-hydraulic transient behavior of coolant which flows through the basemat and is calculated by RELAP. In this paper the calculation results of coupling methodology is compared with experiment result and simulation of finite element model. The calculation results are consistent to the BENSON test rig, which demonstrates the heat removing capability of EPR core-catcher. However, it also reveals the flow instability in coolant channel, which penalizes the core-catcher coolability. But with an improved design of core-catcher with pre-filling water and core-catcher seal, which we presented in this paper, effect of flow instability can be mitigated, especially for the inlet and outlet of coolant channel.

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Звіти організацій з теми "Basement inlier"

Pantaleone, Scott, and Shuvajit Bhattacharya. Core-based reservoir and geomechanical properties of the Tyonek Formation, Hemlock Conglomerate, Talkeetna Formation, and the Mesozoic igneous intrusive complex (basement) in the Cook Inlet basin, Alaska. Alaska Division of Geological & Geophysical Surveys, March 2020. http://dx.doi.org/10.14509/30428.

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