Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences
2010 Annual Meeting of Japan Association of Mineralogical Sciences
Session ID : R3-13
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R3: Extraterrestrial materials
Comparison of Primitive Crusts of the Moon and Vesta as inferred from their pyroxenes in some lunar meteorites and the HED achondrites
*Hiroshi TakedaAkira YamaguchiMakiko Ohtake
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Abstract
Anorthositic crust of the Moon and eucritic crust of the Asteroid 4 Vesta preserve the records of their formation from some magma oceans. Pyroxenes from the HED achondrites, which are proposed to come from Vesta keep the records of the crust formation and the subsequent cooling histories. An inverted pigeonite in a cumulate eucrite shows textures indicative of exsolution and inversion to orthopyroxene. Two lunar meterorite groups of the farside origin have been reported. Although low Th and FeO concentrations are common features, pyroxene fragments similar to those of so-called Mg-suite rocks of the nearside are dominant in the matrices of the Y-86032 group, but more olivine fragments and rare magnesian exsolved pigeonites are found in the matrices of the Dhofar 489 group.
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© 2010 Japan Association of Mineralogical Sciences
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