Two Different Ejection Events for Basaltic Shergottites QUE94201, Zagami and Shergotty (2.6 MA Ago) and Lherzolitic Shergottites LEW88516 and ALH77005(3.5 MA Ago)

Details Two Different Ejection Events for Basaltic Shergottites QUE94201, Zagami and Shergotty (2.6 MA Ago) and Lherzolitic Shergottites LEW88516 and ALH77005(3.5 MA Ago) Two Different Ejection Events for Basaltic Shergottites QUE94201, Zagami and Shergotty (2.6 MA Ago) and Lherzolitic Shergottites LEW88516 and ALH77005(3.5 MA Ago)

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..345e&link_type=abstract

Lunar and Planetary Science, volume 27, page 345

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3

Exposure Age, Gases: Noble, Meteorites: Martian, Meteorites: Snc

Scientific paper

TWO DIFFERENT EJECTION EVENTS FOR BASALTIC SHERGOTTITES QUE94201, ZAGAMI AND SHERGOTTY (2.6 MA AGO) AND LHERZOLITHIC SHERGOTTITES LEW88521 AND ALH77005 (3.5 MA AGO); O. Eugster, A. Weigel, and E. Polnau, Physikalisches Institut, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland. QUE94201 (hereafter QUE) with a total mass of 12.0 g was recognized to be a shergottite. In the framework of a consortium study we obtained interior chip 23 that was taken 3 mm from the fusion crust. The aim of our work is the .characterization of it's noble gas inventory and the dating of the ejection event on Mars. From cosmic-ray produced 3He, 21Ne, and 38Ar we infer thaZagami and obtain an average exposure age of 2.4 Ma. We conclude that QUE was ejected from Mars simultaneously with the other basaltic shergottites Shergotty and Zagami. We postulate that the lherzolithic shergottites ALH77005 (ALH) and LEW88516 (LEW) were ejected about 0.9 Ma earlier. In this work we also present data on LEW and Zagami.

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