Sodicgedrite in ultrahigh-temperature Mg-Al-rich rocks from the Palghat-Cauvery Shear Zone system, southern India
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- TSUNOGAE Toshiaki
- Graduate School of Life and Environmental Sciences (Earth Evolution Sciences), University of Tsukuba Department of Geology, University of Johannesburg
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- SANTOSH M.
- Department of Natural Environmental Science, Faculty of Science, Kochi University
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- SHIMPO Makoto
- Master's Program in Education, University of Tsukuba
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We report high-Na gedrite (sodicgedrite) with up to 3.1 wt% Na2O (∼ 0.81 NaA pfu) in ultrahigh-temperature (UHT) Mg-Al-rich rocks from the northern margin of the Pan-African Madurai Block along the Palghat-Cauvery Shear Zone system, southern India. An amount of NaA of the gedrite increases with increasing AlIV. The sum of NaA and AlIV also increases linearly with decreasing Si suggesting the substitution of NaAAlIV ↔ Si. The negative correlation between Fe + Mg + Si and Al is probably due to the tschermak substitution ((Fe,Mg)VISiIV ↔ AlVIAlIV). The relatively coarse-grained nature and porphyroblastic occurrence of the sodicgedrite suggest that the mineral recrystallized at the peak UHT metamorphism. In contrast, retrograde gedrite with cordierite is less sodic with 1.1-1.6 wt% Na2O (NaA = 0.24-0.35 pfu). Our data suggest that high-Na content in gedrite is a possible indicator of UHT metamorphism.
収録刊行物
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- Journal of Mineralogical and Petrological Sciences
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Journal of Mineralogical and Petrological Sciences 102 (1), 39-43, 2007
一般社団法人 日本鉱物科学会
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詳細情報 詳細情報について
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- CRID
- 1390282681521566720
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- NII論文ID
- 10018411510
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- NII書誌ID
- AA11460926
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- ISSN
- 13493825
- 13456296
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- 本文言語コード
- en
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- データソース種別
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- JaLC
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- 使用不可