Noble gas record and cosmic-ray exposure history of the new CO3 chondrite Moss--Comparison with Lancé and other CO chondrite falls

Rainer Bartoschewitz, Ulrich Ott, Luitgard Franke, Siegfried Herrmann, Yukio Yamamoto, Keisuke Nagao, Morten Bilet, Thomas Grau

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Abstract- The Moss meteorite is the first CO chondrite fall after a time period of 70 yr and the least terrestrially contaminated member of its group. Its cosmic-ray exposure (CRE) age (T3 ~ 13.5 Ma; T21 ~ 14.6 Ma) is distinct among CO chondrites and, within witnessed falls is the shortest after Lancé, which we have reanalyzed. Gas retention ages are approximately 3.95 × 109 yr (U/Th-He) and approximately 4.43 × 109 yr (K/Ar), respectively. Trapped Ar, Kr, and Xe are present in Moss in abundances typical for CO chondrites, with "planetary" elemental and isotopic compositions. Presence of HL-xenon from presolar diamonds is observed in the stepwise release analysis of Lancé. It may also be present in Moss, but it is difficult to ascertain in single-step bulk analyses. It follows from our new data combined with a survey of the literature that the abundance of trapped gases in CO chondrites is not a good indicator of their petrological subtype.

Original languageEnglish
Pages (from-to)1380-1391
Number of pages12
JournalMeteoritics and Planetary Science
Volume45
Issue number8
DOIs
Publication statusPublished - Aug 1 2010

ASJC Scopus subject areas

  • Geophysics
  • Space and Planetary Science

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