A SIMS study of lunar 'komatiitic glasses' - Trace element characteristics and possible origin

Details A SIMS study of lunar 'komatiitic glasses' - Trace element characteristics and possible origin A SIMS study of lunar 'komatiitic glasses' - Trace element characteristics and possible origin

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.1851s&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 54, June 1990, p. 1851-1857.

Computer Science

2

Apollo 16 Flight, Basalt, Glass, Lunar Rocks, Regolith, Trace Elements, Beads, Breccia, Excavation, Impact, Ionization Potentials, Melting, Phases, Moon, Komatiite, Glasses, Trace Elements, Formation, Origin, Reduction, Apollo 16 Mission, Samples, Lunar, Mass Spectrometry, Sims, Concentration, Description, Procedure, Laboratory Studies, Photomicrographs, Melting, Comparisons, Hypotheses, Diagrams, Impacts, Partitioning

Scientific paper

In 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.

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