Peak conditions of kyanite-bearing quartz eclogites in the Sanbagawa metamorphic belt, central Shikoku, Japan
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- MIYAMOTO Atsushi
- Department of Earth and Planetary Sciences, Nagoya University
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- ENAMI Masaki
- Department of Earth and Planetary Sciences, Nagoya University
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- TSUBOI Motohiro
- Department of Earth and Planetary Sciences, Nagoya University
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- YOKOYAMA Kazumi
- Department of Geology and Paleontology, National Science Museum
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Author(s)
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- MIYAMOTO Atsushi
- Department of Earth and Planetary Sciences, Nagoya University
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- ENAMI Masaki
- Department of Earth and Planetary Sciences, Nagoya University
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- TSUBOI Motohiro
- Department of Earth and Planetary Sciences, Nagoya University
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- YOKOYAMA Kazumi
- Department of Geology and Paleontology, National Science Museum
Abstract
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 <i>P-T</i> 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, <i>P-T</i> 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.
Journal
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- Journal of Mineralogical and Petrological Sciences
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Journal of Mineralogical and Petrological Sciences 102(6), 352-367, 2007-12-01
Japan Association of Mineralogical Sciences
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