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Consortium reports on lunar meteorites Yamato 793169 and Asuka 881757, a new type of mare basaltConsortium 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.
Document ID
19940016420
Document Type
Conference Paper
Authors
Yanai, Keizo (National Inst. of Polar Research Tokyo, Japan)
Takeda, Hiroshi (Tokyo Univ. Japan)
Lindstrom, M. M. (NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Tatsumoto, M. (Geological Survey Denver, CO., United States)
Torigoe, N. (Geological Survey Denver, CO., United States)
Misawa, K. (National Inst. of Polar Research Tokyo, Japan)
Warren, P. H. (California Univ. Los Angeles., United States)
Kallemeyn, G. W. (California Univ. Los Angeles., United States)
Koeberl, C. (Wien Univ. Austria)
Kojima, H. (National Inst. of Polar Research Tokyo, Japan)
Date Acquired
September 6, 2013
Publication Date
January 1, 1993
Publication Information
Publication: Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 3: N-Z
Subject Category
ASTROPHYSICS
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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IDRelationTitle19940015909Analytic PrimaryWorkshop on the Martian Northern Plains: Sedimentological, Periglacial, and Paleoclimatic Evolution19940016163Analytic PrimaryTwenty-Fourth Lunar and Planetary Science Conference. Part 3: N-Z