@article{oai:u-ryukyu.repo.nii.ac.jp:02009013, author = {Baba, Sotaro and Uesato, Moeko and Hokada, Tomokazu and Adachi, Tatsuro and Osanai, Yasuhito and Nakano, Nobuhiko and Toyoshima, Tsuyoshi and 馬場, 壮太郎 and 上里, 萌子 and 外田, 智千 and 足立, 達朗 and 小山内, 康人 and 中野, 伸彦 and 豊島, 剛志}, issue = {92}, journal = {琉球大学教育学部紀要=Bulletin of Faculty of Education University of the Ryukyus}, month = {Feb}, note = {Retrograde metamorphic P-T paths of garnet—pyroxene—bearing mafic gneisses from the Brattnipene nunataks in Sør Rondane Mountains, East Antarctica, were examined. The majority of samples preserve irregular—shaped garnet coexisting with clinopyroxene, quartz and plagioclase that developed around magnetite, ilmenite and orthopyroxene. The garnet contains fine—grained worm—like quartz inclusions. The occurrences are common in other mafic gneisses in northern Brattnipene and are interpreted as isobaric cooling textures. In another sample, garnet porphyroblasts have been replaced by symplectites of fine orthopyroxene and plagioclase. The mineral textures indicate near isothermal decompression. Retrograde P-T conditions estimated from rock containing orthopyroxene—plagioclase symplectite are within the range of 6.5 ~ 7.2 kbar, 700 ~ 780℃. Previous reports have revealed that metamorphism around Brattnipene is characterized by counterclockwise P-T path involving near—isobaric cooling. Our new finding suggests that metamorphic rocks formed by isothermal decompression should be present at higher altitude in the Brattnipene or relevant nunataks., 紀要論文}, pages = {161--177}, title = {Metamorphic texture in mafic granulites collected from talus in the Brattnipene, Sør Rondane Mountains, East Antarctica}, year = {2018} }