Mode of occurrence, bulk chemical compositions, and mineral textures of ultramafic rocks in the Lutzow-Holm Complex, East Antarctica
スポンサーリンク
概要
- 論文の詳細を見る
Available data on the mode of occurrence, bulk chemical compositions, and mineral textures of ultramafic rocks (ultrabasic rocks plus "normatively" ultramafic rocks (normative olivine+pyroxenes+ilmenite>70%)) in the Late Proterozoic high-grade Lutzow-Holm Complex are summarized. The bulk chemical compositions suggest that most of them are derived from various parts of layered gabbro. Some are troctolitic, being composed mainly of normative olivine and plagioclase without pyroxenes. The mode of occurrence in the field suggests that they were tectonically fractured and emplaced in the metasedimentary gneisses. Their occurrence mainly in the western part of the Lutzow-Holm complex suggests that original gabbroid masses were present in the presently missing part (ocean floor?) between the adjacent Lutzow-Holm and Yamato-Belgica Complexes. The mineral textures, especially those of garnet and spinel, suggest changing metamorphic conditions within the spinel-amphibole lherzolite facies during prograde recrystallization of the rocks; from earlier relatively high-pressure and low-temperature conditions to later lower-pressure and higher-temperature conditions.
- 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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Yanai Keizo
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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KIZAKI Koshiro
Department of Geology and Mineralogy, Hokkaido University
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Kanisawa Satoshi
Department of Earth Sciences, College of General Education, Tohoku University
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Kanisawa Satoshi
Department Of Earth Sciences College Of General Education Tohoku University
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Kizaki Koshiro
Department Of Marine Sciences Faculty Of Science University Of The Ryukyus
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Kizaki Koshiro
Department Of Geology And Mineralogy Hokkaido University
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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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