Titanium behavior in quartz during retrograde hydration: Occurrence of rutile exsolution and implications for metamorphic processes in the Sør Rondane Mountains, East Antarctica
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概要
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In the central Sør Rondane Mountains, East Antarctica, orthopyroxene felsic gneiss (OPG) was converted to hornblende-biotite felsic gneiss (HBG) by hydration that accompanied the intrusion of pegmatite. The retrograde HBG contains exsolved rutile in quartz. The composition of orthopyroxene and clinopyroxene in OPG suggests a temperature of 840 °C (interpreted as the near-peak temperature), and the composition of hornblende and plagioclase in HBG suggests a temperature of 670–700 °C (interpreted as the temperature during hydration). Ti concentrations in quartz were measured using an electron probe micro-analyzer, and Ti-in-quartz thermometers were applied. Measured Ti concentrations were 110 ppm (equivalent to 760–820 °C) for homogeneous quartz from OPG and 35 ppm (650–700 °C) for an exsolution-free area of a quartz grain from HBG. The pre-exsolution Ti concentration in quartz from HBG was reconstructed with 100 μm beam diameter and 25 kV of accelerating voltage, giving 103 ppm, similar to the value obtained for homogeneous quartz in OPG. The temperatures obtained using a Ti-in-quartz thermometer are consistent with those estimated using other thermometers. Although analysis of the main constitute minerals in HBG yields the conditions of hydration, the reconstructed pre-exsolution Ti content in quartz within HBG yields the pre-hydration conditions. Thus, the Ti-in-quartz thermometer is a potentially powerful tool with which to identify the peak or near-peak temperature conditions, even for retrogressed metamorphic rocks.
著者
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Adachi Tatsuro
Department of Polar Science, School of Multidisciplinary Sciences, The Graduate University for Advan
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Hokada Tomokazu
National Institute of Polar Research, 10-3 Midori-cho, Tachikawa, Tokyo 190-8518, Japan
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Osanai Yasuhito
Division of Evolution of Earth Environments, Faculty of Social andCultural Studies, Kyushu Universit
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TToyoshima suyoshi
Graduate School of Science and Technology, Niigata University, 8050 Ikarashi 2-no-cho, Niigata-shi,
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Baba Sotaro
Department of Natural Environment, University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa 903-0213
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Nakano Nobuhiko
Division of Evolution of Earth Environments, Faculty of Social andCultural Studies, Kyushu Universit
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Baba Sotaro
Department Of Natural Environment University Of The Ryukyus 1 Senbaru Nishihara Okinawa 903-0213 Jap
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Baba Sotaro
Department Of Crustal Studies National Institute Of Polar Research
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Adachi Tatsuro
Department Of Polar Science School Of Multidisciplinary Sciences The Graduate University For Advance
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Osanai Yasuhito
Division Of Evolution Of Earth Environments Faculty Of Social Andcultural Studies Kyushu University
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Osanai Y
Fukuoka Univ. Education Munakata Jpn
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Osanai Yasuhito
Division Of Evolution Of Earth Environments Kyushu University
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Hokada Tomokazu
National Institute Of Polar Research 10-3 Midori-cho Tachikawa Tokyo 190-8518 Japan
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Nakano Nobuhiko
Division Of Evolution Of Earth Environments Faculty Of Social Andcultural Studies Kyushu University
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Osanai Yasuhito
Division Of Evolution Of Earth Environments Faculty Of Social And Cultural Studies Kyushu University
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Ttoyoshima Suyoshi
Graduate School Of Science And Technology Niigata University 8050 Ikarashi 2-no-cho Niigata-shi Niig
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Hamamoto T
Dia Consultants Co. Ltd. Aichi Jpn
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Hamamoto Takuji
Graduate School Of Science And Technology Niigata University
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Osanai Y
Division Of Evolution Of Earth Environments Faculty Of Social And Cultural Studies Kyushu University
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Osanai Y
Division Of Earth Sciences Faculty Of Social And Cultural Studies Kyushu University
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Osanai Yasuhito
Division Of Earth Sciences Faculty Of Social And Cultural Studies Kyushu University
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Nakano Nobuhiko
Division Of Earth Sciences Faculty Of Social And Cultural Studies Kyushu University
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Hokada Tomokazu
National Inst. Of Polar Res.
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Toyoshima suyoshi
Graduate School of Science and Technology, Niigata University, 8050 Ikarashi 2-no-cho, Niigata-shi,
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Toyoshima Suyoshi
Graduate School Of Science And Technology Niigata University 8050 Ikarashi 2-no-cho Niigata-shi Niig
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Toyoshima Tsuyoshi
Graduate School Of Science And Technology Earth Science Niigata University
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