کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4469630 1314215 2006 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Cerium negative anomaly just before the Permian and Triassic boundary event — The upward expansion of anoxia in the water column
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Cerium negative anomaly just before the Permian and Triassic boundary event — The upward expansion of anoxia in the water column
چکیده انگلیسی

A negative excursion of Ce and a succeeding steep decline in δ13C found just before the Permian and Triassic boundary (PTB) of Julfa area offer a geochemical constraint on the cause of the mass extinction event of PTB. The geochemical studies of recent anoxic basins like the Black Sea strongly suggest that the Ce negative excursion of these carbonate platform sequence indicates the buildup of anoxic water in the offshore realm. The suboxic water mass associated with the Ce negative anomaly zone migrated and invaded into shallow carbonate shelf around 600 thousand years before the PTB. This was followed by an anoxic water mass without Ce anomaly, and resulted in a steep decline in δ13C and then mass extinction of marine shelf biota.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Palaeogeography, Palaeoclimatology, Palaeoecology - Volume 229, Issue 4, 5 January 2006, Pages 335–344
نویسندگان
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