Chloritoid-bearing basic schists from the Sanbagawa metamorphic belt, central Shikoku : their petrologic significance and tectonic implications
スポンサーリンク
概要
- 論文の詳細を見る
Chloritoid- and taramite-bearing basic schists occur on the streambed at Ikadadu in the garnet zone of the Sanbagawa metamorphic belt, central Shikoku. Their major constituent phases are chloritoid, taramite, chlorite, paragonite, phengite, epidote, ilmenite, titanite, albite and quartz. Chloritoid occurs only as inclusions in garnet. The appearance of chloritoid in the basic schists is strongly dependent on their restricted FeO-rich and high Al2O3/(CaO + Na2O + K2O) bulk-rock compositions. The metamorphic pressure (P) and temperature (T) conditions, 0.9 GPa and 505-515°C, are estimated by using equilibrium relationships among chloritoid, taramite, chlorite, paragonite, garnet and quartz. These P-T conditions are distinctly lower than those estimated for a chloritoid-bearing assemblage at the eclogite facies stage of pelitic schists in the Seba eclogite unit (1.7 GPa/525-555°C), 0.5-1 km north of the Ikadadu outcrop. This implies that there is a significant difference in the peak metamorphic pressure of the chloritoid-forming stages between the Ikadadu and Seba chloritoid-bearing schists, indicating the existence of a tectonic discontinuity between the two localities. Chloritoid and amphibole-bearing assemblages are stable at various metamorphic P-T conditions within suitable bulk rock compositions and their phase equilibria are helpful in discussing P-T conditions for various metamorphic rocks.
- 日本鉱物科学会の論文
- 2005-04-01
著者
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ENAMI Masaki
Department of Earth and Planetary Sciences, Nagoya University
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Enami Masaki
Dep. Of Earth And Planetary Sciences Nagoya Univ.
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Enami Masaki
Department Of Earth And Planetary Sciences Graduate School Of Science Nagoya University
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Enami Masaki
Nagoya Univ. Nagoya Jpn
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KO Zaw
Department of Earth and Planetary Sciences, Nagoya University
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AOYA Mutsuki
Department of Earth and Planetary Sciences, Nagoya University
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Ko Zaw
Department Of Earth And Planetary Sciences Nagoya University
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Aoya Mutsuki
Department Of Earth And Planetary Sciences Nagoya University
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- Comment and Reply
- CHLORINE-RICH CALCIC AMPHIBOLES : THEIR CRYSTALLOCHEMICAL PROPERTIES DEPENDING ON PETROGENETICAL ENVIRONMENT
- Eclogite and Related Metamorphism in the Sanbagawa Belt, Southwest Japan
- Omphacite-bearing metapelite from the Besshi region, Sambagawa metamorphic belt, Japan : Prograde eclogite facies metamorphism recorded in metasediment
- Compositional range of α and β zoisites(短報)
- Illustrated Introduction to Eclogite in Japan
- Optical characters, particularly optic dispersion, of sodic-and subcalcic-amphiboles in Sanbagawa schists
- Structural position of the Seba eclogite unit in the Sambagawa Belt : Supporting evidence for an eclogite nappe
- Cr-rich allanite-(Ce) in the serpentinite-metapelite reaction layer in the Sanbagawa belt of Nushima, Hyogo Prefecture, Japan
- Emplacement P-T conditions of Pan-African biotite-amphibole granitoids in the Nkambe area, Cameroon
- Influence of garnet hosts on the Raman spectra of quartz inclusions
- On sodic plagioclase in some rocks of the Sanbagawa metamorphic belt in the Bessi district, Sikoku, Japan.