Spinel + Quartz association from the Kerala khondalites, southern India : evidence for ultrahigh-temperature metamorphism
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概要
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Granulite facies metapelites (khondalites) from Chittikara are characterized by the assemblage Grt + Sil + Bt + Crd + Spl + Kfs + Pl + Qtz ± graphite. The rocks show a series of mineral reactions such as: (1) Bt + Sil + Qtz = Grt + Crd ± Kfs, (2) Grt + Sil + Qtz = Crd, (3) Grt + Crd + Sil = Spl + Qtz , (4) Spl + Qtz = Crd, and (5) Grt + Sil = Spl + Crd. Spinel and quartz occur in direct grain contact and their stability considerations in appropriate reaction grids indicate > 950°C at 8 kbar. This, together with the ca. 1000°C temperatures derived from mesoperthites suggests ultrahigh temperature metamorphism in the khondalite belt. Electron microprobe data on the various minerals have been used to compute pressure-temperature estimates from mineral phase equilibria thermobaromtery. Temperature estimates from spinel-cordierite thermometry are around 900°C, while garnet-cordierite thermometer yields an upper estimate of 818°C. Estimates based on garnet-sillimanite-plagioclase-quartz barometer indicate pressures up to 8 kbar. Evaluation of the microstructures and reactions in the khondalites using available reaction grids for pelitic rocks provide evidence for peak metamorphism at high or ultrahigh temperatures followed by steep decompression from around 8 kbar down to 4 kbar. The P-T path attests to a rapid exhumation history probably associated with the extensional collapse following collision of continental blocks during the assembly of Gondwana in the late Pan-African.
- 日本鉱物科学会の論文
- 2004-10-01
著者
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Santosh M.
Faculty of Science, Kochi University
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Manoj S.
Biopharmaceutical Research Suven Life Sciences Ltd.
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Santosh M
Kochi Univ. Kochi Jpn
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Santosh M.
Faculty Of Science Kochi University
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Santosh M.
Centre For Earth Science Studies
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Santosh M.
Biopharmaceutical Research Suven Life Sciences Ltd.
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TSUNOGAE Toshiaki
Institute of Geoscience, University of Tsukuba
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Tsunogae Toshiaki
Graduate School Of Science And Technology Niigata University
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Tsunogae Toshiaki
Institute Of Geoscience The University Of Tsukuba
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Satish-kumar M.
Geological Survey Of India
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Santosh M
Faculty Of Science Kochi University
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Morimoto Taro
Faculty Of Science Kochi University
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YOSHIMURA Yasutaka
Faculty of Science, Kochi University
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Tsunogae T
Univ. Tsukuba Ibraki Jpn
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Yoshimura Y
Faculty Of Science Kochi University
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Yoshimura Yasutaka
Faculty Of Science Kochi University
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