Peak conditions of kyanite-bearing quartz eclogites in the Sanbagawa metamorphic belt, central Shikoku, Japan
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概要
- 論文の詳細を見る
Kyanite-bearing eclogitic assemblages occur in the highest-grade zone of the Sanbagawa metamorphic belt, central Shikoku, Japan. The eclogites consist mainly of garnet, omphacite, phengite, kyanite, epidote, quartz and rutile. Compositionally variable amphibole (glaucophane/barroisite/pargasite), phengite and paragonite occur as inclusions in garnet and other eclogite facies phases. Careful examination of garnet zoning in kyanite-eclogites suggests that (i) most garnet grains show complex zoning consisting of relatively Ca-rich/Mg-poor inner and Ca-poor/Mg-rich outer segments, (ii) the inner segment of the zoned garnet formed at the eclogite facies stage, and (iii) the Mg-rich outermost rim of garnet does not always represents a composition at peak eclogite stage but could form at lower-pressure conditions of subsequent epidote-amphibolite facies. The assemblage of inner segment of garnet, omphacite, phengite, kyanite and quartz points to equilibrium conditions of 2.3-2.4 GPa/675-740 °C. The metamorphic P-T conditions of the eclogite facies stage reported in literature have been estimated assuming that the outermost rim of garnet with Mg-rich composition was in equilibrium with other eclogite facies phases. Therefore, P-T estimations of the eclogite facies stage in the Sanbagawa metamorphic belt should be re-examined carefully on the basis of textural and compositional heterogeneities of constituent minerals.
- 日本鉱物科学会の論文
- 2007-12-01
著者
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ENAMI Masaki
Department of Earth and Planetary Sciences, Nagoya University
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MIYAMOTO Atsushi
Department of Computer and Mathematical Sciences, Graduate School of Information Sciences, Tohoku Un
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Enami Masaki
Dep. Of Earth And Planetary Sciences Nagoya Univ.
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横山 一己
国立科博・地学
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Enami Masaki
Department Of Earth And Planetary Sciences Graduate School Of Science Nagoya University
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YOKOYAMA Kazumi
Department of Geology and Paleontology, National Museum of Nature and Science
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TSUBOI Motohiro
Department of Earth and Planetary Sciences, Nagoya University
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Tsuboi Motohiro
Dep. Of Chemistry School Of Sci. And Technol. Kwansei Gakuin Univ.
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Tsuboi Motohiro
Department Of Chemistry School Of Science And Technology Kwansei Gakuin University
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Miyamoto Atsushi
Department Of Cardiovascular Medicine School Of Medicine Hokkaido University
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Miyamoto Atsushi
Department Of Earth And Planetary Sciences Nagoya University
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Yokoyama Kazumi
Department Of Geology And Paleontology National Museum Of Nature And Science
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Yokoyama Kazumi
Dep. Of Geology And Paleontology National Museum Of Nature And Sci.
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