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Irradiation history and accretionary processes in lunar and meteoritic brecciasParticle track studies reveal an abundant record of fossil solar flare tracks in breccia components. Metamorphic events govern the degree to which this record is preserved, and studies of phases with different track retentivities allow limits to be placed on temperatures reached during a rock's history. The least affected breccias have never experienced temperatures as great as 300 C. Two breccias which contain xenon from spontaneous fission of Pu-244 (14301 and 14318) and Xe-129 (14301 only) have never been heated above about 700 C. This and evidence for a surface irradiation of some of the breccia components support a surface implantation model for the origin of the xenon in these breccias. Green glass spheres in 15086 have not been heated above about 300 C during or after breccia formation yet have retained fission tracks for less than 0.7 G.y. Argon ages of about 3.5 G.y. for similar green glass are at least five times as great and may indicate that the glass was not completely outgassed at is formation.
Document ID
19740040211
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Macdougall, D.
Rajan, R. S.
Hutcheon, I. D.
Price, P. B.
(California, University Berkeley, Calif., United States)
Date Acquired
August 7, 2013
Publication Date
January 1, 1973
Subject Category
Space Sciences
Meeting Information
Meeting: Lunar Science Conference
Location: Houston, TX
Start Date: March 5, 1973
End Date: March 8, 1973
Accession Number
74A22961
Funding Number(s)
CONTRACT_GRANT: NGL-05-003-410
Distribution Limits
Public
Copyright
Other

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