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Petrogenesis of lunar highlands meteorites



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Meteoritics Planetary Science 39 Nr 4 503 529 2004 Abstract available online at http meteoritics org Petrogenesis of lunar highlands meteorites Dhofar 025 Dhofar 081 Dar al Gani 262 and Dar al Gani 400 J T CAHILL 1 2 C FLOSS 3 M ANAND 1 L A TAYLOR 1 M A NAZAROV 4 and B A COHEN5 1Planetary Geosciences Institute Department of Earth and Planetary Sciences University of Tennessee Knoxville Tennessee 37996 USA 2Hawaii Institute of Geophysics and Planetology University of Hawaii Honolulu Hawaii 96822 USA 3Laboratory for Space Sciences Washington University St Louis Missouri 63130 USA 4Vernadsky Institute of Geochemistry and Analytical Chemistry Russian Academy of Sciences Moscow 117975 Russia 5Department of Earth and Planetary Sciences MSCO3 2040 University of New Mexico Albuquerque New Mexico 87131 0001 USA Corresponding author E mail jcahill higp hawaii edu Received 14 November 2002 revision accepted 1 March 2004 Abstract The petrogenesis of four lunar highlands meteorites Dhofar 025 Dho 025 Dhofar 081 Dho 081 Dar al Gani 262 DaG 262 and Dar al Gani 400 DaG 400 were studied For Dho 025 measured oxygen isotopic values and Fe Mn ratios for mafic minerals provide corroboratory evidence that it originated on the Moon Similarly Fe Mn ratios in the mafic minerals of Dho 081 indicate lunar origin Lithologies in Dho 025 and Dho 081 include lithic clasts granulites and mineral fragments A large number of lithic clasts have plagioclase AN and coexisting mafic mineral Mg that plot within the gap separating ferroan anorthosite suite FAN and high magnesium suite HMS rocks This is consistent with whole rock Ti Sm ratios for Dho 025 Dho 081 and DaG 262 which are also intermediate compared to FAN and HMS lithologies Although ion microprobe analyses performed on Dho 025 Dho 081 DaG 262 and DaG 400 clasts and minerals show far stronger FAN affinities than whole rock data suggest most clasts indicate admixture of 12 HMS component based on geochemical modeling In addition coexisting



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