KREEP glass and the exotic provenance and formation of polymict breccia 66055.

Details KREEP glass and the exotic provenance and formation of polymict breccia 66055. KREEP glass and the exotic provenance and formation of polymict breccia 66055.

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87..147r&link_type=abstract

Journal of Geophysical Research, Vol. 87, Suppl., p. A147 - A158

Physics

2

Moon Samples:Petrology

Scientific paper

Polymict breccia 66055 from the Apollo 16 site is unique in that it contains abundant brown KREEP glass (0.3 - 0.4% K2O) and related brown glassy breccias which have fluid forms. During assembly it consisted of hot and cold debris which flowed together. Terrains in which 66055 might have formed exist to the west of the landing site. Suitable igneous target materials for the KREEP glass have not positively been identified in 66055, so the petrogenesis of Apollo 16 KREEP remains enigmatic, although the presence of a 'granitic' glass fragment embedded in KREEP glass suggests that it is igneous. A local volcanic origin is more consistent with the spatial relationships, as deduced from orbital geochemical data, than is a basin ejecta deposit.

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