Geological Journal
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Petrological and geochemical interpretation of Triassic–Jurassic boundary sections from northern IraqTriassic–Jurassic sedimentary successions (Baluti and Sarki formations) in northern Iraq record a variety of environmental changes that may be related to global Triassic–Jurassic (Tr/J) boundary events. The diversity of some benthic fauna decreases through the transitional boundary beds. The coastal marine environment of the lower part of the Baluti Formation is followed by shallower tidal... ... hiện toàn bộ
Geological Journal - Tập 50 Số 2 - Trang 157-172 - 2015
Geochemical features of the black shales from the Wuyu Basin, southern Tibet: implications for palaeoenvironment and palaeoclimateAbstract The Mangxiang Formation black shales are the most important hydrocarbon source rocks in the Wuyu Basin. Trace and rare earth element (REEs) of the black shales from the Wuyu Basin were studied in order to understand their depositional environments and palaeoclimate. Thirty one black shale samples from the Wuyu Basin were analysed by inductively coupled plas... ... hiện toàn bộ
Geological Journal - Tập 52 Số 2 - Trang 282-297 - 2017
Formation and evolution of Xianshuihe Fault Belt in the eastern margin of the Tibetan Plateau: Constraints from structural deformation and geochronologyThe Xianshuihe Fault Belt (XSF), along which the syntectonic Zheduoshan batholith was emplaced, has great significance for the reconstruction of the tectonic framework in the eastern margin of the Tibetan Plateau. In this contribution, formation process and evolution of the XSF are discussed based on the structural deformation in the field and the geochronology of Zheduoshan batholith. The... ... hiện toàn bộ
Geological Journal - Tập 55 Số 12 - Trang 7953-7976 - 2020
Patterns, processes and likely causes of the Ordovician trilobite radiation in South ChinaAbstract The Ordovician genus‐diversity trajectories of trilobites and the radiation patterns previously proposed in South China are reviewed on the basis of an extensive and intensive study of 32 representative collections assigned respectively to thesuecicus ,hirundo andclavus graptolite... ... hiện toàn bộ
Geological Journal - Tập 42 Số 3-4 - Trang 297-313 - 2007
Do all mass extinctions represent an ecological crisis? Evidence from the Late OrdovicianAbstract The high rate of species extinction in recent decades is seen by many ecologists as heralding an extinction of catastrophic magnitude in the near future. The ecological consequences of such a biodiversity crisis are hard to predict, but some indication of likely effects can be gained from the knowledge of mass extinctions in the past. The Late Ordovician ex... ... hiện toàn bộ
Geological Journal - Tập 36 Số 3-4 - Trang 329-340 - 2001
The southern Menderes Massif (western Turkey): geochronology and exhumation historyAbstract In the southern flank of the Menderes Massif, western Turkey, an E–W‐trending quartz–mica vein was recognized in the augen gneisses of the so‐called ‘core’ series. Rb‐Sr determinations of two undeformed or slightly deformed mica books from the vein yielded Palaeocene–Early Eocene ages (c . 62–43 Ma) for the vein formation. The new ... ... hiện toàn bộ
Geological Journal - Tập 35 Số 3-4 - Trang 285-296 - 2000
Tectonic setting of Triassic magmatic and metallogenic event in the Duobaoshan mineralization area of Heilongjiang Province, NE China
Geological Journal - Tập 52 Số 1 - Trang 67-91 - 2017
Petrographical, mineralogical, and geochemical characteristics of the Palaeocene lateritic bauxite deposits of Kachchh Basin, Western IndiaPetrographical, mineralogical, and geochemical characteristics of a blanket‐type lateritic bauxite deposit, bordering the Deccan basalt in Kachchh, are investigated to interpret the parent rock, lateritization processes, and palaeogeographical position of the basin. The presence of partly weathered vesicular basalt at the base of the succession along with partly preserved plagioclase, augi... ... hiện toàn bộ
Geological Journal - Tập 54 Số 4 - Trang 2588-2607 - 2019
The eogenetic karst of the Cambrian Longwangmiao Formation in the Yangtze Platform: Implications for the eustatic and stratigraphic correlations of Toyonian (Cambrian)To make a better understanding of the stratigraphic correlation and ocean processes during the transition from Series 2 to Series 3 in the Cambrian, this study investigated the characteristics and origin of the palaeokarst in the uppermost part of the Longwangmiao Formation (Toyonian) and established the carbon isotopic curves of the shallow‐water succession. Macroscopically, the palaeokar... ... hiện toàn bộ
Geological Journal - Tập 54 Số 6 - Trang 3720-3736 - 2019
Identification of facies‐controlled eogenetic karstification in the Upper Cretaceous of the Halfaya oilfield and its impact on reservoir capacityPenecontemporaneous dissolution has been considered as the dominant origin of reservoir formation, whereas epigenetic dissolution has also played certain roles in the improvement of reservoir capacity in the Upper Cretaceous Mishrif Formation in the Middle East. Here, we report a possible new reservoir origin based on a case study in the Halfaya oilfield of Iraq, that is, facies‐controlled... ... hiện toàn bộ
Geological Journal - Tập 54 Số 1 - Trang 450-465 - 2019
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