R5: Extraterrestrial materials

[R5-05] Mineralogical study of NWA 7317 and Tafassasset: Two “equilibrated” meteorites related to CR chondrites

「発表賞エントリー」

*Abe Daiki¹, Takashi Mikouchi² (1. Tokyo Univ., Sci., 2. Tokyo Univ., Univ. Museum)

Keywords:CR chondrite, NWA7317, Tafassasset, thermal evolution, CR parent body

CR-related meteorites, NWA7317 (CR6) and Tafassasset, have similar constituent minerals, but NWA 7317 contains fragments of barred olivine chondrules and Tafassasset shows more heterogeneous textures. Tafassasset has more Mg-rich olivine and pyroxene compositions, implying that their source materials were different. Additionally, mineral compositions in NWA 7317 are more homogeneous. Therefore, Tafassasset is more unequilibrated, but may have been more differentiated to crystallize from melt.