Lunar meteorite Yamato-86032 - Mineralogical, petrological, and geochemical studiesYamato-86032 is a shock-lithified anorthositic fragmental breccia. It consists mainly of highly feldspathic meta-breccias and meta-meltrocks and possibly contains a small contribution from mare lithologies, but there is no indication of a KREEP component. In many respects Y-86032 is similar to the previously described lunar meteorites Y-82192/3, but there are some notable differences. We have analyzed about 40 major and trace elements in bulk matrix, impact melt, and clast samples from two chips of Y-86032. The abundances of most lithophile and incompatible elements are lower in Y-86032 than in Y-82192 (which contains very low abundances compared to normal lunar highland rocks). The REE abundances are comparable to those of Y-82192. The elements Sc, Cr, Mn, Fe and Co have significantly lower abundances than in Y-82192, and the siderophile element pattern is also different. Since cosmic ray exposure data indicate pairing of Y-86032 with Y-82192/3, the source region for these meteorites on the moon must have been fairly heterogeneous.
Document ID
19930068552
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Koeberl, Christian (Lunar and Planetary Inst., Houston, TX; Vienna Univ. Austria)
Kurat, Gero (NASA Headquarters Washington, DC United States)
Brandstaetter, Franz (Naturhistorisches Museum Vienna, Austria)