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The nature of the KT impactor. A Cr-54 reappraisal

机译:KT撞击器的性质。 Cr-54重新评估

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摘要

According to the variations observed in the various meteorite classes, Cr-54 represents an isotopic tool for planetary body discrimination. In the search for the nature of the Cretaceous-Tertiary (KT) impactor, Cr isotopic measurements were already performed at KT boundary. The current work is aimed to modernize Cr isotopic data with high-precision measurements to confirm a carbonaceous chondrite type infall, the contribution of which is also estimated. Isotopic signatures of two marine clays (Caravaca, Stevens Klint) exhibit an isotopic ratio which would represent a mixing of a carbonaceous chondrite of CM2 type with terrestrial material in a ratio 6% to 19%. A single impactor may account for both marine and continental Cr isotopic signatures. (c) 2005 Elsevier B.V. All rights reserved.
机译:根据在各种陨石类别中观察到的变化,Cr-54代表了用于识别行星体的同位素工具。在寻找白垩纪-第三系(KT)撞击器的性质时,已经在KT边界处进行了Cr同位素测量。当前的工作旨在通过高精度测量使Cr同位素数据现代化,以确认碳质球粒陨石类型的塌陷,并对其贡献做出估算。两种海洋粘土(卡拉瓦卡(Caravaca),史蒂文斯·克林特(Stevens Klint))的同位素特征显示出同位素比率,该比率表示CM2型碳质球粒陨石与地面物质的混合比率为6%至19%。单个撞击物可解释海洋和大陆Cr同位素特征。 (c)2005 Elsevier B.V.保留所有权利。

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