The nature of the KT impactor. A 54Cr reappraisal |
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| Affiliation: | 1. Institut für Planetologie, Westfälische Wilhelms – Universität Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany;2. Origins Laboratory, Department of Geophysical Sciences, The University of Chicago, IL 60637, USA;1. Department of Geoscience, University of Nevada, Las Vegas, United States;2. Department of Earth and Planetary Sciences, Harvard University, United States;1. Centre for Star and Planet Formation, Natural History Museum of Denmark, University of Copenhagen, Copenhagen DK-1350, Denmark;2. Hawai''i Institute of Geophysics and Planetology, University of Hawai''i at Manoa, HI 96822, USA;1. Institut für Planetologie, University of Münster, Wilhelm-Klemm-Straße 10, 48149 Münster, Germany;2. Nuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory, Livermore, CA 94550, United States |
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| Abstract: | 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. |
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