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On the basis of the petrographical evidence, the following reactions are inferred : orthopyroxene+sillimanite+quartz=cordierite, orthopyroxene+sillimanite=cordierite+sapphirine, garnet+quartz=orthopyroxene+cordierite, garnet=orthopyroxene+cordierite+sapphirine. These reactions are visualized on a simplified (Fe, Mg) O-Al_2O_3-SiO_2 diagram, and are interpreted on P-T and P-_\u003cμFeO\u003e diagrams, respectively. The reactions imply nearly isothermal decompression after the peak metamorphic conditions. The prograde segment of the P-T path is inferred by relict spinel and corundum inclusions invariably rimmed by sapphirine in silica-undersaturated granulites. A possible reaction is spinel+corundum+cordierite=sapphirine. The petrogenetic grid for a model FMAS system indicates that the decompressional P-T path passed between two invariant points; [Spl] 11±1 kbar at 1040±15℃, and [Qtz] 8-9 kbar at 950℃. Assuming a constant temperature, a P-_\u003cμFeO\u003e diagram is used to demonstrate that the variety of reactions depends on bulk chemical compositions. Several geothermobarometers, including garnet-orthopyroxene, garnet-orthopyroxene-plagioclase-quartz, garnet-plagioclase-sillimanite-quartz, GRAIL, GRIPS and sapphirine-spinel are applied. The garnet-orthopyroxene and sapphirine-spinel geothermometers yield around 700-850℃, and these values are considerably lower than those inferred from the petrogenetic grid mentioned above. 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REACTION TEXTURES IN GRANULITES FROM FOREFINGER POINT, ENDERBY LAND, EAST ANTARCTICA : AN ALTERNATIVE INTERPRETATION ON THE METAMORPHIC EVOLUTION OF THE RAYNER COMPLEX
https://doi.org/10.15094/00002755
https://doi.org/10.15094/000027553015472f-fe10-4742-ba7e-212ff9246b49
名前 / ファイル | ライセンス | アクション |
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KJ00002368385 (1.8 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1994-09-01 | |||||
タイトル | ||||||
タイトル | REACTION TEXTURES IN GRANULITES FROM FOREFINGER POINT, ENDERBY LAND, EAST ANTARCTICA : AN ALTERNATIVE INTERPRETATION ON THE METAMORPHIC EVOLUTION OF THE RAYNER COMPLEX | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
ID登録 | ||||||
ID登録 | 10.15094/00002755 | |||||
ID登録タイプ | JaLC | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
論文名よみ | ||||||
その他のタイトル | REACTION TEXTURES IN GRANULITES FROM FOREFINGER POINT, ENDERBY LAND, EAST ANTARCTICA : AN ALTERNATIVE INTERPRETATION ON THE METAMORPHIC EVOLUTION OF THE RAYNER COMPLEX | |||||
著者名よみ |
モトヨシ, ヨウイチ
× モトヨシ, ヨウイチ× イシカワ, マサヒロ / |
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著者名(英) |
MOTOYOSHI, Yoichi
× MOTOYOSHI, Yoichi× ISHIKAWA, Masahiro× FRASER, Geoffrey L. |
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著者所属(英) | ||||||
en | ||||||
National Institute of Polar Research | ||||||
著者所属(英) | ||||||
en | ||||||
Institute of Geology and Paleontology, Faculty of Science, Tohoku University | ||||||
著者所属(英) | ||||||
en | ||||||
Research School of Earth Sciences, Australian National University | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Aluminous granulites from Forefinger Point in Enderby Land, East Antarctica, preserve a variety of reaction textures which demonstrate a part of the P-T evolution. On the basis of the petrographical evidence, the following reactions are inferred : orthopyroxene+sillimanite+quartz=cordierite, orthopyroxene+sillimanite=cordierite+sapphirine, garnet+quartz=orthopyroxene+cordierite, garnet=orthopyroxene+cordierite+sapphirine. These reactions are visualized on a simplified (Fe, Mg) O-Al_2O_3-SiO_2 diagram, and are interpreted on P-T and P-_<μFeO> diagrams, respectively. The reactions imply nearly isothermal decompression after the peak metamorphic conditions. The prograde segment of the P-T path is inferred by relict spinel and corundum inclusions invariably rimmed by sapphirine in silica-undersaturated granulites. A possible reaction is spinel+corundum+cordierite=sapphirine. The petrogenetic grid for a model FMAS system indicates that the decompressional P-T path passed between two invariant points; [Spl] 11±1 kbar at 1040±15℃, and [Qtz] 8-9 kbar at 950℃. Assuming a constant temperature, a P-_<μFeO> diagram is used to demonstrate that the variety of reactions depends on bulk chemical compositions. Several geothermobarometers, including garnet-orthopyroxene, garnet-orthopyroxene-plagioclase-quartz, garnet-plagioclase-sillimanite-quartz, GRAIL, GRIPS and sapphirine-spinel are applied. The garnet-orthopyroxene and sapphirine-spinel geothermometers yield around 700-850℃, and these values are considerably lower than those inferred from the petrogenetic grid mentioned above. On the basis of the petrographical interpretation and preliminary results of SHRIMP dating (SHIRAISHI, pers. commun.), it is concluded that the Forefinger Point granulites probably do not represent a reworked portion of the Archaean Napier Complex, but rather, they may be the result of Cambrian events in the East Antarctic Shield. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA1072335X | |||||
書誌情報 |
Proceedings of the NIPR Symposium on Antarctic Geosciences 巻 7, p. 101-114, 発行日 1994-09 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |