کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9538953 1359950 2005 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A tsunami deposit at the Cretaceous/Paleogene boundary in the Neuquén Basin of Argentina
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فسیل شناسی
پیش نمایش صفحه اول مقاله
A tsunami deposit at the Cretaceous/Paleogene boundary in the Neuquén Basin of Argentina
چکیده انگلیسی
A coarse-grained sandstone bed of Cretaceous/Paleogene (K/Pg) boundary age occurs in a homogeneous neritic shelf mudstone sequence (Jagüel Formation) in the Neuquén Basin of Argentina. This bed, 15-25 cm thick, contains abundant plagioclase, broken shells and sharks' teeth. Sedimentological features include an erosive base, abundant rip-up clasts, normal grading and hummocky cross-bedding. The K/Pg boundary age of the bed was confirmed by calcareous nannofossils. Similar to other sections in the Gulf Coast region and the Danish Basin, a “dead zone” significantly depleted in macrofossils is evident in the basal 1 m above the clastic layer. In combination, these features suggest that the clastic layer represents a tsunami deposit that was related to the Chicxulub impact event in Yucatan/Mexico. Mechanisms of tsunami wave amplification in this extremely distal and somewhat protected setting are poorly understood but the funnel-shape of the basin may have promoted the unusually strong sedimentological response.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cretaceous Research - Volume 26, Issue 2, April 2005, Pages 283-297
نویسندگان
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