کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6445279 | 1640665 | 2012 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
In quest of Paleocene global-scale transgressions and regressions: constraints from a synthesis of regional trends
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
زمین شناسی
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چکیده انگلیسی
Chronostratigraphically-justified records of regional transgressions and regressions are important for understanding the nature of the Paleocene shoreline shifts on a global scale. Review of previously synthesized data from 7 tectonically “stable” regions, namely the eastern Russian Platform, Northwestern Europe, Northwestern Africa, Northeastern Africa, the Arabian Platform, the northern Gulf of Mexico, and Southern Australia, allows a comparison of transgressions and regressions interpreted in these regions. No common patterns are found in the early Danian and late Selandian, which reflects small or zero eustatic fluctuations that are overwhelmed locally on coastlines by regional tectonic motions and local changes in dynamic support of surface topography by mantle flow. Sea level was stabilized during these stages by a warm climate and a lack of planetary-scale tectonic changes. We have detected a middle-late Danian regression that occurred in 5 of 7 study regions, and can be explained by glacial advance at â¼62-63Â Ma or by concurrent subduction of the Izanagi-Pacific ridge beneath eastern Asia. An early-middle Selandian transgression also occurred in 5 regions, probably, as a result of a hyperthermal at â¼61Â Ma that coincided with emplacement of large igneous provinces in the oceanic domain. Both events are characterized by significant diachroneity, which can also be explained by the influence of regional tectonic subsidence or uplift. Results of the present study permit us to propose a tentative framework for a new Paleocene eustatic curve that is constrained globally using available records of transgressions and regressions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Proceedings of the Geologists' Association - Volume 123, Issue 1, January 2012, Pages 7-18
Journal: Proceedings of the Geologists' Association - Volume 123, Issue 1, January 2012, Pages 7-18
نویسندگان
Dmitry A. Ruban, Svetlana O. Zorina, Clinton P. Conrad, Nadezhda I. Afanasieva,