What got melted to form lunar mafic impact-melt breccias?

Details What got melted to form lunar mafic impact-melt breccias? What got melted to form lunar mafic impact-melt breccias?

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..751k&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 751.

Computer Science

3

Breccia, Hypervelocity Impact, Lunar Rocks, Mineralogy, Olivine

Scientific paper

Prominent among rock types at each of the last four Apollo sites are impact melt breccias (IMBs) that are substantially more mafic (18-24 percent FeO + MgO) than typical feldspathic lunar crust (6-10 percent). Mafic IMBs (MIMBs) are the most mafic, common component of the regoliths at Apollos 14 and 16 and account for about 70 percent of the regolith of the South Massif at Apollo 17. In addition to being mafic (for the lunar highlands), MIMBs are characterized by high concentrations of incompatible trace elements and are the principal carriers of the geochemical signature associated with KREEP in the regolith of the Apollo landing sites. With few exceptions all rocks with compositions corresponding to Fra Mauro basalts are actually MIMBs. An important feature of MIMBs is that compositions differ from landing site to landing site, and several different compositional groupings of MIMBs have been identified at the Apollos 15, 16, and 17 sites. One longstanding question of lunar science concerns what got melted to form the MIMBs. In this study I address the question again, with the specific goal of accounting for the compositional variation among MIMB groups in terms of impact mixing of a small set of common components.

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