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Evidence of Space Weathering in Regolith Breccias II: Asteroidal Regolith BrecciasSpace weathering products, such as agglutinates and nanophaase iron-bearing rims are easily preserved through lithifcation in lunar regolith breccias, thus such products, if produced, should be preserved in asteroidal regotith breccias as well. A study of representative regolith breecia meteorites, Fayetteville (H4) and Kapoeta (howardite), was undertaken to search for physical evidence of space weathering on asteroids. Amorphous or npFe(sup 0)-bearing rim cannot be positively identified in Fayetteville, although possible glass rims were found. Extensive friction melt was discovered in the meteorite that is difficult to differentiate from weathered materials. Several melt products, including spherules and agglutinates, as well as one irradiated rim and one possible npFe(sup 0)-bearing rim were identified in Kapoeta. The existence of these products suggests that lunar-like space weathering processes are, or have been, active on asteroids.
Document ID
20110008108
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Noble, Sarah K.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Keller, Lindsay P.
(NASA Johnson Space Center Houston, TX, United States)
Pieters, Carle M.
(Brown Univ. Providence, RI, United States)
Date Acquired
August 25, 2013
Publication Date
January 6, 2011
Publication Information
Publication: Meteoritics and Planetary Science
Volume: 45
Issue: 12
Subject Category
Lunar And Planetary Science And Exploration
Funding Number(s)
CONTRACT_GRANT: NAG5-11763
CONTRACT_GRANT: NGT9-66
CONTRACT_GRANT: RTOP 344-31-40-07
Distribution Limits
Public
Copyright
Other

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