کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4732418 1356863 2008 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Geochemistry of shales from the Paleoproterozoic to Neoproterozoic Vindhyan Supergroup: Implications on provenance, tectonics and paleoweathering
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
پیش نمایش صفحه اول مقاله
Geochemistry of shales from the Paleoproterozoic to Neoproterozoic Vindhyan Supergroup: Implications on provenance, tectonics and paleoweathering
چکیده انگلیسی

Major, trace and rare earth element (REE) concentrations were measured for 88 shale samples from the Paleoproterozoic to Neoproterozoic Vindhyan Supergroup in central India. The major and trace element data of the Vindhyan shales are compared with North American Shale Composite, upper crust, mid-oceanic ridge basalts and many other shale standards of Archean, Proterozoic and Phanerozoic age. REE concentrations of the Vindhyan shales are comparable to the upper continental crust. Various discriminant diagrams were used to reveal the inferred provenance, tectonics and paleoweathering conditions. A predominantly granitic source rock is inferred for the Lower Vindhyan Shales, whereas partial contribution from basaltic source is evident during deposition of the Upper Vindhyan Shales. Existing paleocurrent data and the present geochemical investigations together suggest Archean–Paleoproterozoic basement rocks, exposed beyond the southern basin margin of the Vindhyan outcrops as the possible source rocks. The deposition of the Vindhyan shales took place in an intracratonic basin where sediments were primarily derived from stable continental areas. Moderate climatic conditions are inferred during the deposition of the shales. The Upper Vindhyan Shales, however, reflect more intense weathering compared to the Lower Vindhyan Shales, which may be attributed to relative tectonic stability and more humid conditions during deposition of Upper Vindhyan Shales.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Asian Earth Sciences - Volume 32, Issue 1, 15 February 2008, Pages 34–48
نویسندگان
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