SAPPHIRINE-BEARING SILICA-UNDERSATURATED GRANULITES FROM FOREFINGER POINT, ENDERBY LAND, EAST ANTARCTICA : EVIDENCE FOR A CLOCKWISE P-T PATH?
スポンサーリンク
概要
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Sapphirine-bearing silica-undersaturated granulites from Forefinger Point in Enderby Land, East Antarctica, preserve a variety of reaction textures suggestive of the prograde segment of the P-T evolution followed by nearly isothermal decompression. The granulites are composed of sapphirine, orthopyroxene, cordierite, garnet, spinel, corundum, K-feldspar, biotite and accessory zircon. Petrographical characteristics are i) spinel and corundum occur only as inclusions in sapphirine, ii) relict cordierite and biotite are included in the corundum, and iii) the sapphirine is locally in direct contact with porphyroblastic garnet, and the garnet is occasionally replaced by symplectitic intergrowth of orthopyroxene+sapphirine+cordierite±biotite. Chemographic relations in the FeO-MgO-Al_2O_3-SiO_2 system (FMAS), textural relations and chemical data indicate a clockwise P-T trajectory with marked decompression following peak conditions.
- 国立極地研究所の論文
著者
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Fraser G
Research School Of Earth Sciences Australian National University
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Motoyoshi Yoichi
National Institute of Polar Research
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Ishikawa Masahiro
Geological Institute, Yokohama National University
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Ishikawa Masahiro
Institute Of Geology And Paleontology Faculty Of Science Tohoku University:(present Address)geologic
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Ishikawa M
Yokohama National Univ. Yokohama Jpn
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FRASER Geoffrey
Research School of Earth Sciences, Australian National University
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Motoyoshi Y
National Inst. Polar Res. Tokyo Jpn
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Fraser Geoffrey
Research School Of Earth Sciences Australian National University
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Ishikawa Masahiro
Institute Of Geology And Paleontology Faculty Of Science Tohoku University
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