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Noble gases in LEW88516 shergottite: Evidence for exposure age pairing with ALH77005LEW88516 contains excess amounts of radiogenic Ar-40 and Xe-129 that are slightly greater than those observed in ALH77005, but in the same relative proportion as much larger excesses observed in EET79001. Cosmogenic He-3 and Ne-21 abundances in LEW88516 are very similar to those for ALH77005 and are consistent with a common initiation of cosmic ray exposure -2.8 Myr ago for four of the five shergottites. Exposure of these four shergottites could have been under different shielding in a common meteoroid, or in several objects.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Bogard, D. D.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Garrison, D. H.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1993
Publication Information
Publication: Lunar and Planetary Inst., Twenty-fourth Lunar and Planetary Science Conference. Part 1: A-F
Subject Category
Inorganic And Physical Chemistry
Accession Number
Distribution Limits
Work of the US Gov. Public Use Permitted.

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