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Laser-Ablation ICP-MS Analyses of Meteoritic Metal Grains in Lunar Impact-Melt BrecciasLunar impact-melt breccias contain metal grains from the meteorites that formed the breccias. Because the breccias contain clastic material that may derive from older breccias, metal grains from earlier impacts may be present, too. The large subset of moderately mafic (8 - 12% FeO), KREEP-rich ("LKFM") melt breccias is particularly important because: (1) these are the melt breccias most likely to have been produced in basin-forming impacts, (2) it is from these breccias that many of the approx. 3.9 Gyr ages that are so common in lunar samples derive, (3) the breccias contain large proportions of FeNi metal, more than 1% in some types of Apollo 16 breccias, and (4) the metal potentially provides information about the impactors causing the apparent cataclysm at 3.9 Gyr.
Document ID
20030111097
Document Type
Conference Paper
Authors
Korotev, R. L. (Washington Univ. Saint Louis, MO, United States)
Jolliff, B. L. (Washington Univ. Saint Louis, MO, United States)
Campbell, A. J. (Chicago Univ. Chicago, IL, United States)
Humayun, M. (Chicago Univ. Chicago, IL, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2003
Publication Information
Publication: Lunar and Planetary Science XXXIV
Subject Category
Lunar and Planetary Science and Exploration
Funding Number(s)
CONTRACT_GRANT: NAG5-4172
CONTRACT_GRANT: NAG5-9800
Distribution Limits
Public
Copyright
Public Use Permitted.

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