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Noble Gases in the Monahans Chondrite and Halite: Ar-39 - Ar-40 Age, Space Exposure Age, Trapped Solar Gases, and Neutron FluenceIn the Monahans H5 chondrite, Zolensky et al. report the first occurrence of grains of halite (NaCl), which contain minor sylvite (KCl) and tiny inclusions of liquid water. Here we report Ar-39 - Ar-40 ages of Monahans light (4.53 Ga) and dark phases and of the halite (>4.33 Ga). We report the presence of trapped solar gases in the dark phase, demonstrating that it represents a prior regolith on the Monahans parent body, We also report the cosmic-ray exposure age of Monahans and the neutron fluence experienced by the regolith component. Because the halite grains are apparently located only in the regolith phase, they may have formed by early hydrous activity within the Monahans parent body regolith, or they may have been introduced from outside.
Document ID
20000111085
Acquisition Source
Johnson Space Center
Document Type
Preprint (Draft being sent to journal)
Authors
Bogard, Donald D.
(NASA Johnson Space Center Houston, TX United States)
Garrison, Daniel H.
(NASA Johnson Space Center Houston, TX United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 2000
Subject Category
Astrophysics
Meeting Information
Meeting: Lunar and Planetary Science
Location: Houston, TX
Country: United States
Start Date: March 13, 2000
End Date: March 17, 2000
Sponsors: Lunar and Planetary Inst.
Funding Number(s)
PROJECT: RTOP 344-31-00
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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