Consortium reports on lunar meteorites Yamato 793169 and Asuka 881757, a new type of mare basalt

Details Consortium reports on lunar meteorites Yamato 793169 and Asuka 881757, a new type of mare basalt Consortium reports on lunar meteorites Yamato 793169 and Asuka 881757, a new type of mare basalt

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24.1555y&link_type=abstract

In Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 3: N-Z p 1555-1556 (SEE N94-20636 05-91

Other

2

Basalt, Chemical Composition, Chronology, Isotopes, Lunar Maria, Meteorites, Meteoritic Composition, Chemical Analysis, Lunar Geology, Lunar Rocks, Mineralogy, Minerals, Titanium Oxides, Trace Elements

Scientific paper

Consortium studies on lunar meteorites Yamato 793169 and Asuka 881757 (formerly Asuka-31) were performed to characterize these new samples from unknown locations in the lunar mare. Both meteorites are coarse-grained mare rocks having low Mg/Fe ratios (bulk mg'=30-35) and low TiO2 (1.5-2.5 percent in homogenized bulk samples). They are intermediate between VLT and low-Ti mare basalts. Although these meteorites are not identical to each other, their mineral and bulk compositions, isotopic systematics, and crystallization ages are remarkably similar and distinct from those of all other mare basalts. They appear to represent a new type of low-Ti mare basalt that crystallized at about 3.9Ga. These meteorites are inconsistent with the canonical correlation between the TiO2 contents and ages of mare basalts and suggest that our knowledge of lunar volcanism is far from complete.

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