The nature of the KT impactor. A Cr-54 reappraisal | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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

Type de publication:

Journal Article

Source:

Earth and Planetary Science Letters, Volume 241, Ticket 3-4, p.780-788 (2006)

ISBN:

0012-821X

URL:

http://www.sciencedirect.com/

Mots-clés:

IMPACT; MULTIPLE IMPACTS; CHONDRITES; SIDEROPHILE; SEDIMENTS

Résumé:

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.

Notes:

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