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A SIMS study of lunar 'komatiitic glasses' - Trace element characteristics and possible originIn Apollo 16 regolith breccias, Wentworth and McKay (1988) identified a suite of minute (less than 120 microns) 'komatiitic glass beads'. The wide major element compositional range, and ultra-Mg-prime character of the glasses suggest a variety of possible origins from complex impact processes to complex volcanic processes involving rather unusual and primitive magmatism. The extent of trace element depletion or enrichment in these glasses appears to be correlated to the siderophile character of the element (ionization potential or experimentally determined silicate melt/Fe metal partition coefficients. The ultra-Mg-prime glasses are depleted in Co relative to a bulk Moon Mg/Co exhibited by many lunar samples (volcanic glasses, basalts, regolith breccia, estimated upper mantle). The low Co and high incompatible element concentrations diminish the possibility that these glasses are a product of lunar komatiitic volcanism or impact, excavation, and melting of a very high Mg-prime plutonic unit.
Document ID
19900052106
Document Type
Reprint (Version printed in journal)
Authors
Shearer, C. K. (South Dakota School of Mines and Technology Rapid City, SD, United States)
Papike, J. J. (South Dakota School of Mines and Technology Rapid City, SD, United States)
Galbreath, K. C. (South Dakota School of Mines and Technology Rapid City, United States)
Wentworth, S. J. (Lockheed Engineering and Management Services Co., Inc. Houston, TX, United States)
Shimizu, N. (MIT Cambridge, MA, United States)
Date Acquired
August 14, 2013
Publication Date
June 1, 1990
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 54
ISSN: 0016-7037
Subject Category
LUNAR AND PLANETARY EXPLORATION
Funding Number(s)
CONTRACT_GRANT: NAG9-22
Distribution Limits
Public
Copyright
Other