CHLORINE-RICH CALCIC AMPHIBOLES : THEIR CRYSTALLOCHEMICAL PROPERTIES DEPENDING ON PETROGENETICAL ENVIRONMENT
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概要
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Cl-rich (>3wt%) calcic amphiboles are found in two kinds of petrogenetical environment. Type A is continental occurrence, which is closely related to high-grade metamorphism, i.e., calcareous metamorphic rock, granulite, charnockite and skarn deposit in the amphibolite and the granulite facies terranes. Type B is submarine occurrence, which is closely related to oceanfloor metamorphism, i.e., the metabasalts, metagabbro and metamorphosed ultramafic rocks from mid-oceanic ridges. Cl-rich calcic amphiboles from both rocks (types A and B) are mostly higher than 0.9 in (Na+K) content, higher than 0.75 in Fe^<2+>/(Fe^<2+>+Mg+Mn) ratio and higher than 1.9 in Al^<IV> content (total iron as FeO and O=23). Unit cell volume of Cl-rich calcic amphiboles is distinctly larger than that of Cl-poor calcic amphiboles. Cl-rich calcic amphiboles from the rocks of type A are 0.6-0.95 in K/(Na+K) ratio, but those of type B are 0.05-0.5 in K/(Na+K) ratio. The low X_K values of Cl-rich calcic amphiboles of type B are due partly to very low K_2O content of submarine basic and ultrabasic rocks, and due partly to ocean-floor metamorphism by the fluids of near seawater salinity.
- 国立極地研究所の論文
著者
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ENAMI Masaki
Department of Earth and Planetary Sciences, Nagoya University
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Enami Masaki
Department Of Earth Sciences Faculty Of Science Nagoya University
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Enami Masaki
Department Of Earth And Planetary Sciences Graduate School Of Science Nagoya University
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SUWA Kanenori
Department of Earth Sciences, Faculty of Science, Nagoya University
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Suwa Kanenori
Department Of Earth And Planetary Sciences School Of Science Nagoya University
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- Comment and Reply
- CHLORINE-RICH CALCIC AMPHIBOLES : THEIR CRYSTALLOCHEMICAL PROPERTIES DEPENDING ON PETROGENETICAL ENVIRONMENT
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