文章基本信息

标题：Spherules associated with the Cretaceous–Paleogene boundary in Poland
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作者：Tomasz Brachaniec ; Łukasz Karwowski ; Krzysztof Szopa 等
期刊名称：Acta geologica Polonica
印刷版ISSN：0001-5709
出版年度：2014
卷号：64
期号：1
页码：99-108
语种：English
出版社：Institute of Geology, University of Warsaw
摘要：The succession of the Lechówka section near Chełm in south-eastern Poland presents the first complete record of the Cretaceous–Paleogene (K–Pg) boundary in Poland. Samples of the boundary clay were examined for microtektites and shocked minerals to confirm the impact origin of the sediment. The spheroidal fraction reveals morphological and mineralogical features, e.g., spherules, similar to material from the K–Pg boundary as described from elsewhere. The impact genesis of the spherules is confirmed by the presence of nickel-rich spinel grains on their surfaces. The spinels are considered to be primary microlites and, thus, the spherules at Lechówka can be classified as microkrystites. No shocked minerals were noted. The deposits with spherules comprise Aland Mg-rich smectite (Cheto smectite). This almost pure Mg-rich smectite, forming up to 100% of the clay fraction, derived from the weathering of the impact glass. It is proposed that the spherules isolated from the Cretaceous-Paleogene boundary clay at Lechówka come from the Chicxulub crater in Mexico.
关键词：Cretaceous–Paleogene boundary;Poland;Spherule;Microkrystites;Impact origin;Ni-rich spinels;Smectite