Osumilite and spinel + quartz from Sri Lanka : Implications for UHT conditions and retrograde P-T path
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概要
- 論文の詳細を見る
We report here the occurrence of osumilite as fine isolated inclusions in garnet porphyroblasts from a granulite facies rock in the southwestern part of the Highland Complex in Sri Lanka. Garnet porphyroblasts in the matrix are partly rimmed by sillimanite-biotite-K-feldspar assemblage as well as cordierite-K-feldspar-quartz assemblage. Spinel coexisting with quartz is also observed in the same sample. The pressure-temperature condition must be above 950°C at around 7 kbar pressure, on the basis of osumilite stability in KFMASH system. The cooling and decompression continued down to 850°C, into the biotite-sillimanite-K-feldspar-quartz stability field. During decompression fO2 must have increased leading to the stability of Zn-rich-spinel with quartz after cordierite. Our findings provide direct evidence for ultrahigh-temperature (UHT) metamorphic conditions in southwestern Highland Complex, and also suggest the existence of a possible UHT zone within the high-grade terrane of Sri Lanka.
- 日本鉱物科学会の論文
- 2004-10-01
著者
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Osanai Yasuhito
Division of Evolution of Earth Environments, Faculty of Social andCultural Studies, Kyushu Universit
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Osanai Yasuhito
Division Of Evolution Of Earth Environments Graduate School Of Social And Cultural Studies Kyushu Un
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SAJEEV K.
Basic Science Research Institute, Chonbuk National University
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Sajeev K.
Basic Science Research Institute Chonbuk National University
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Osanai Yasuhito
Division Of Earth Sciences Faculty Of Social And Cultural Studies Kyushu University
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