Petrography and geothermometry-geobarometry of Botnnuten, East Antarctica
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概要
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Botnnuten is an isolated nunatak situated between Lutzow-Holm Bay and the Yamato Mountains, East Antarctica. It is composed of well-layered pelitic and basic gneisses with subordinate amounts of calc-silicate rock. The petrographical examinations revealed that the assemblages of sillimanite+Kfeldspar+biotite in the pelitic gneiss, and garnet+clinopyroxene+orthopyroxene+plagioclase+quartz in the basic gneiss are observed to have coexisted stably. Sillimanite+spinel assemblage included in porphyroblastic garnet is totally interpreted to be a breakdown product after staurolite during the prograde recrystallization. The present phase relations and geothermo-barometries yielded the metamorphic conditions of Botnnuten rocks to be 750-800℃ at 5-6 kbars. On the basis of the petrographical features with respect to the occurrence of aluminous silicate minerals and the recrystallization history inferred from the textural relationships, and the P-T conditions mentioned above, it is concluded that Botnnuten is a low-pressure portion of the Lutzow-Holm Complex.
- 国立極地研究所の論文
著者
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Shiraishi Kazuyuki
National Institute of Polar Research
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Motoyoshi Yoichi
Department Of Applied Geology University Of New South Wales:(present Address)national Institute Of P
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Shiraishi K
National Institute Of Polar Research
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