کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4469214 1622364 2006 16 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Traces of the marine Mjølnir impact event
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Traces of the marine Mjølnir impact event
چکیده انگلیسی

The sediments of the Barents Sea region carry geological information reflecting the influence of the Mjølnir impact event at the Volgian–Ryazanian boundary, even in remote locations without any direct macroscopic geological and paleontological evidence. The ejecta distribution in the area was probably highly asymmetrical, but geological and related geochemical and paleontological signals in the sediments show the environmental consequences of the impact (e.g., impact generated waves, tsunami, currents, changing redox conditions) to be more symmetrically distributed. The influences of the asteroid impact are seen in the distributional anomalies (Ir, Th, U, Ni, Cr and prasinophycean algae of the genus Leiosphaeridia) of studied cores from 30 to 500 km away from the crater. A core from about 800 km southwest of the crater carries no obvious direct evidence of the impact.This study shows that additional geological parameters other than, e.g., shocked quartz, spherules, Ir-anomalies, may carry information indicating possible environmental impact influence even more than 10 crater diameters away from the impact site.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Palaeogeography, Palaeoclimatology, Palaeoecology - Volume 241, Issues 3–4, 14 November 2006, Pages 621–636
نویسندگان
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