Other
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55.3009t&link_type=abstract
(The MacAlpine Hills Lunar Meteorite Consortium - Lunar and Planetary Science Conference, 21st, Special Session, Houston, TX, Ma
Other
2
Lunar Crust, Metamorphism (Geology), Meteoritic Composition, Olivine, Pyroxenes, Breccia, Earth-Moon System, Magnesium
Scientific paper
The new lunar meteorite MAC88105 has been studied by mineral-chemical techniques and was compared with the Yamato lunar meteorites. Clast types and pyroxene compositions of MAC88105 indicate that evidence for a pairing with any known lunar meteorites is unlikely. Clast-laden vitric breccia and comminuted mineral fragments in glassy matrix are common components as in other lunar meteorites, but granulitic clasts are not as common as in other lunar meteorites. The large and common granulite-like meta-igneous clasts still preserve lath-shaped plagioclase crystals with fine-grained olivine and pyroxenes in the interstices. Pyroxenes with mg number = Mg x 100/(Mg + Fe) between 70-48 mol pct are common, but more Mg-rich pyroxenes and plutonic pyroxenes from nonmare pristine crustal rocks are rare. One basaltic clast contains pyroxenes with zoning trends more Mg-rich than the above mg range and than those of the VLT basalts common in lunar meteorites. MAC88105 preserves true glass in the matrix as observed by a transmission electron microscope. The preservation of glassy materials indicates that MAC88105 had a metamorphic annealing history different from other lunar meteorites.
Miyamoto Masamichi
Mori Hiroshi
Saito Jun
Takeda Hiroshi
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