Cretaceous-Tertiary boundary marine extinctions: The Russian platform record

Q4 Earth and Planetary Sciences

Spanish Journal of Paleontology Pub Date : 2022-09-02 DOI:10.7203/sjp.25157

Y. Herman, S. K. Bhattacharya, K. Perch-Nielsen, L. F. Kopaevitch, D. P. Naĭdin, V. Frolov, J. Jeffers, A. Sarkar

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引用次数: 4

Abstract

Floral, faunal and stable isotope evidence in a continuous sequence of lates! Cretaceous and earliest Tertiary shallow water marine deposits in the Mangyshlak Península, USSR suggest sudden and severe cooling possibly accompanied by increased salinities of the surface water al the Maastrichtian/Danian (M/D) boun dary, immediately followed by marked warming and decreased salinities. Geologic evidence indicates that the temperature decline was coeval with widespread and intense volcanic activity which reached a peak at the close of the Mesozoic Era. Volatile emissions led to acid rain which depressed the pH of surface water. lncreased acidity temporarily prohibited calcite nucleation of the surface dwelling warm-water plankton. Superimposed upon decreased alkalinity, severe and rapid climatic changes caused the extinction of calcareous phyto and zooplankton. These results provide the most complete nanno, micro and macrofossil data as well as geochemical and clay mineralogical record from a single region across the paleomagnetically dated Cretaceous/Tertiary (KIT) boundary to date.

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白垩纪-第三纪边界海洋灭绝：俄罗斯平台记录

一个连续的更新序列中的花、动物和稳定同位素证据！苏联Mangyshlak Península的白垩纪和最早的第三纪浅水海洋沉积物表明，突然而严重的冷却可能伴随着马斯特里赫特/达尼安（M/D）边界地表水盐度的增加，紧接着明显的变暖和盐度的降低。地质证据表明，温度下降与广泛而强烈的火山活动同时发生，火山活动在中生代末期达到顶峰。挥发性排放物导致酸雨，降低地表水的pH值。酸度的增加暂时阻止了表层温水浮游生物的方解石成核。再加上碱度的下降，严重而迅速的气候变化导致了钙质植物和浮游动物的灭绝。这些结果提供了迄今为止古地磁定年白垩纪/第三纪（KIT）边界上单个区域最完整的纳米、微观和宏观化石数据以及地球化学和粘土矿物学记录。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Spanish Journal of Paleontology Earth and Planetary Sciences-Paleontology

CiteScore

1.00

自引率

0.00%

发文量

389

期刊介绍： The journal is international and publishes original manuscripts in Spanish and, preferentially, British spelling English on all aspects of broad interest in palaeontology. Particularly, the SJP aims to communicate and promote palaeontological research to the global scientific community. Moreover, articles on new discoveries and approaches are especially welcome. Finally, studies of present-day material can be included if they have significant palaeontological relevance.