Geological Journal

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Petrological and geochemical interpretation of Triassic–Jurassic boundary sections from northern Iraq
Geological Journal - Tập 50 Số 2 - Trang 157-172 - 2015
Ali I. Al‐Juboury, Tom McCann
Triassic–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 flat an... hiện toàn bộ
Geochemical features of the black shales from the Wuyu Basin, southern Tibet: implications for palaeoenvironment and palaeoclimate
Geological Journal - Tập 52 Số 2 - Trang 282-297 - 2017
Zhongwei Wang, Xiugen Fu, Xinglei Feng, Chunyan Song, Dong Wang, Wenbin Chen, Shengqiang Zeng
AbstractThe 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 plasma–mass spectrometry and X‐ray fl... hiện toàn bộ
Late Pan‐African magmatism and crustal development in northeastern Egypt
Geological Journal - Tập 22 Số 4 - Trang 281-301 - 1987
Abdel‐Fattah M. Abdel‐Rahman, Robert F. Martin
AbstractThe voluminous Pan‐African calc‐alkaline granitic suite of the Ras Gharib crustal segment in northeastern Eygpt provides a typical example of orogenic magmatism. The 552 ± 7 Ma‐old granodiorite–adamellite and leucogranite suite is compositionally broad (58 to 77 wt.% SiO2) and exhibits calc‐alkaline geochemical trends and trace‐element characteristics typical of the volcanic‐arc granites. ... hiện toàn bộ
Early Triassic carbon isotope excursions from South China: proxies for devastation and restoration of marine ecosystems following the end‐Permian mass extinction
Geological Journal - Tập 42 Số 3-4 - Trang 371-389 - 2007
Jinnan Tong, Jingxun Zuo, Zhong‐Qiang Chen
AbstractEarly Triassic carbon isotopes are measured based on 1422 carbonate bulk samples from 10 Lower Triassic sections in different palaeogeographic settings in South China. Early Triassic fluctuation ofδ13C is used as a proxy for environmental change to discuss the devastation and restoration of marine ecosystems following the biggest Phanerozoic mass extinction at the end of the Permian. Early... hiện toàn bộ
U–Pb zircon age, geochemical and isotopic characteristics of the Miaoya syenite and carbonatite complex, central China
Geological Journal - Tập 52 Số 6 - Trang 938-954 - 2017
Jiang Zhu, Lian‐Xun Wang, Sanguo Peng, Lianhong Peng, Chang-Xiong Wu, Xiaofei Qiu
The Miaoya syenite and carbonatite complex is located in the southern margin of the South Qinling belt, central China. LA‐ICP‐MS zircon U–Pb dating reveals that the syenite and carbonatite have crystallization ages of 445.2 ± 2.6 Ma (MSWD = 0.66) and 434.3 ± 3.2 Ma (MSWD = 1.08), respectively. Both syenite and carbonatite display low ISr values (0.7004 to 0.7053) and depleted εNd(t) values of +1.1... hiện toàn bộ
The last glaciers (Loch Lomond Advance) in Snowdonia, N. Wales
Geological Journal - Tập 17 Số 2 - Trang 111-133 - 1982
John Gray
AbstractEvidence for 35 former cwm glaciers has been mapped in Snowdonia, N. Wales. Glacial limits are based on end moraines, boulder and drift limits, and the down‐valley extent of hummocky moraine. Protalus ramparts indicate that at least 16 semi‐permanent snow beds down to altitudes of 150 m also existed. Radiocarbon dates and pollen stratigraphy indicate that the glaciers and snow beds belong ... hiện toàn bộ
Statistical analysis on secular records of igneous geochemistry: Implication for the early Archean plate tectonics
Geological Journal - Tập 55 Số 1 - Trang 994-1002 - 2020
He Liu, Weidong Sun, J. Deng
In recent years, application of statistical analysis to a sufficiently large geochemical database has become more and more popular to reveal the onset and evolution of plate tectonics as a consequence of the development of computer science and storage technology. Here, we introduce a robust statistical method to process a filtered geochemical dataset including predominantly continental basaltic ro... hiện toàn bộ
The southern Menderes Massif (western Turkey): geochronology and exhumation history
Geological Journal - Tập 35 Số 3-4 - Trang 285-296 - 2000
Erdi̇n Bozkurt, Muharrem Satır
AbstractIn 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 data are interpreted to closely post‐date the time of major ... hiện toàn bộ
The tectonic regime along the Andes: Present‐day and Mesozoic regimes
Geological Journal - Tập 45 Số 1 - Trang 2-25 - 2010
Víctor A. Ramos
AbstractThe analyses of the main parameters controlling the present Chile‐type and Marianas‐type tectonic settings developed along the eastern Pacific region show four different tectonic regimes: (1) a nearly neutral regime in the Oregon subduction zone; (2) major extensional regimes as the Nicaragua subduction zone developed in continental crust; (3) a Marianas setting in the Sandwich subduction ... hiện toàn bộ
The eogenetic karst of the Cambrian Longwangmiao Formation in the Yangtze Platform: Implications for the eustatic and stratigraphic correlations of Toyonian (Cambrian)
Geological Journal - Tập 54 Số 6 - Trang 3720-3736 - 2019
Chaojin Lu, Zhen Liu, Haibo Jia, Tian Hai-qin, Huayao Zou, Quanqi Dai, Bo Han
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 palaeokarst featu... hiện toàn bộ
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