PROGRESSIVE METAMORPHISM OF CALC-SILICATE ROCKS FROM THE PRINCE OLAV AND SOYA COASTS, EAST ANTARCTICA
スポンサーリンク
概要
- 論文の詳細を見る
Metamorphosed calc-silicate rocks occur sporadically as small masses enclosed in other high-grade metasedimentary rocks of the Late Proterozoic Lutzow-Holm Complex in the Prince Olav and Soya Coasts, East Antarctica. Southwestward progressive metamorphism of the calc-silicate rocks is clarified which is in good agreement with the results of previous studies on the pelitic and basic-intermediate rocks. Two isograds are mapped on the basis of the continuous reaction epidote+quartz±calcite=grandite garnet+plagioclase+Fe-oxides±scapolite+H_2O and the discontinuous reaction grossular+quartz=wollastonite+anorthite in the amphibolite-facies and granulite-facies terrains, respectively. The latter is the best-defined isograd among those so far drawn in various rock types of the Lutzow-Holm Complex, as it is based on a vapor-absent reaction and the effects of additional components such as Fe_2O_3 and Na_2O on the reaction are estimated to have been negligible in the studied rocks. Pressure of about 7kb is evaluated by the discontinuous reaction at T=810±20℃ in the granulite-facies terrain. The present study, together with the previously published ones, confirms that the regional metamorphic geotherm of the Lutzow-Holm Complex based on the progressive mineral zones was of the medium-pressure type and was distinct from those of the adjacent Rayner and Yamato-Belgica Complexes. The occurrence of grossular with or without quartz in the granulite-facies terrain suggests that the vapor phase was generally poor in both H_2O and CO_2 during the high-grade metamorphism.
- 国立極地研究所の論文
著者
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Hiroi Yoshikuni
Department of Earth Sciences, Faculty of Science, Chiba University
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Shiraishi Kazuyuki
National Institute of Polar Research
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Motoyoshi Y
National Inst. Polar Res. Tokyo Jpn
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Motoyoshi Yoichi
Department Of Applied Geology University Of New South Wales:(present Address)national Institute Of P
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Katsushima Takayoshi
Sumiko Consultants Co. Ltd.
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Hiroi Y
Department Of Earth Sciences Faculty Of Science Chiba University
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Hiroi Yoshikuni
Department Of Earth Sciences Chiba University
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Shiraishi Kazuyuki
Department Of Crustal Studies National Institute Of Polar Research
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