کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4681218 | 1634952 | 2006 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: The nature of the KT impactor. A 54Cr reappraisal The nature of the KT impactor. A 54Cr reappraisal](/preview/png/4681218.png)
According to the variations observed in the various meteorite classes, 54Cr 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.
Journal: Earth and Planetary Science Letters - Volume 241, Issues 3–4, 31 January 2006, Pages 780–788