کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4469048 1622356 2007 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Upper Ordovician mudrock facies and trace fossils in the northern Holy Cross Mountains, Poland, and their relation to oxygen- and sea-level dynamics
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Upper Ordovician mudrock facies and trace fossils in the northern Holy Cross Mountains, Poland, and their relation to oxygen- and sea-level dynamics
چکیده انگلیسی

The bulk of the Ordovician sedimentary record in the northern Holy Cross Mts., Poland, is composed of dark claystones, which record the long-term dysoxic conditions lasting throughout the entire Caradoc. However, a relatively short-term oxygenation event corresponding to the middle Caradoc sea-level lowstand interrupts this monotonous succession. Termination of the low oxygen environment was triggered by a major change in oceanic circulation due to onset of polar cooling. It resulted in the progressive benthic oxygenation and increase of colonization of the highly enriched sediment by soft-bodied burrowers as can be envisaged from ichnofabric of the lower to middle Ashgill sedimentary record. The rapid but gradual upward progradation of the Upper Ordovician mudrock facies into the coarse-grained deposits appears to be closely related to the late Ashgill glacio-eustatic regressive event.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Palaeogeography, Palaeoclimatology, Palaeoecology - Volume 246, Issues 2–4, 6 April 2007, Pages 488–501
نویسندگان
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