Cosmic ray exposure ages of nakhlites - Nakhla, Lafayette, Governador Valadares - and Chassigny: one ejection event?

Korochantseva, E. V.; Schwenzer, S.; Buikin, A. I.; Hopp, J.; Ott, U. and Trieloff, M. (2011). Cosmic ray exposure ages of nakhlites - Nakhla, Lafayette, Governador Valadares - and Chassigny: one ejection event? In: 42nd Lunar and Planetary Conference, 7-11 Mar 2011, Houston, TX, USA.

URL: http://www.lpi.usra.edu/meetings/lpsc2011/?view=ab...

Abstract

An important question currently vi-gorously discussed is if all nakhlites and possibly Chassigny were ejected by the same impact event from a common Martian location. However, the uncertainties of cosmic-ray exposure (CRE) ages are usually high and thus the crucial point in this discussion. Here we present CRE ages for Nakhla (Nak), Lafayette (Laf) and Chassigny (Chas) studied by ⁴⁰Ar-³⁹Ar dating of irradiated mineral separates and whole rocks. We also report CRE ages for these meteorites and Governador Valadares (GV) using the cosmogenic nuclides ³He, ²¹Ne, and ³⁸Ar in unirradiated whole rock samples.

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