Note on the mineral texture and chemistry of the eastern Bushveld Complex
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概要
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Preliminary petrological study was carried out for the Rustenburg Layered Suite in the eastern Bushveld Complex. The Rustenburg Layered Suite consists of the Marginal Zone, Lower Zone, Critical Zone, Main Zone and Upper Zone. The mineral texture and chemical compositional variations were examined from the Lower to the Upper Zone. Although the number of sample is small, the crystallization sequence and presence of two types of magma can be recognized from the following mineral textures and compositions : (1) Plagioclase occurs as a post-cumulus phase in rocks from the Lower Zone to lower subzone in the Critical Zone, whereas it occurs as a cumulus phase in rocks from the upper subzone in the Critical Zone, Main Zone and Upper Zone. (2) A distinctive compositional difference of plagioclase and orthopyroxene can be seen between the lower subzone and upper subzone in the Critical Zone. In the lower subzone in the Critical Zone, post-cumulus plagioclase has low An within the range of 74-50,whereas the upper subzone has An=83-63. This result is consistent with previous work. In addition, Norite in the upper subzone in the Critical Zone has orthopyroxene-developed (Opx-rich) and clinopyroxene-developed (Cpx-rich) domains. In the Opx-rich domain, high-X_<Mg> orthopyroxene and low-An plagioclase inclusions can be seen. On the other hand, both low-X_<Mg> orthopyroxene inclusions and high-An plagioclase inclusions are observed in the Cpx-rich domain. These textural and compositional relationships suggest possible magma mixing on the thin section scale.
- 国立極地研究所の論文
著者
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Baba Sotaro
Department of Natural Environment, University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa 903-0213
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Baba Sotaro
Department Of Crustal Studies National Institute Of Polar Research
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Hiroi Yoshikuni
Department of Earth Sciences, Faculty of Science, Chiba University
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Hokada Tomokazu
Department of Polar Science, School of Mathematical and Physical Sciences, The Graduate University f
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Shiraishi Kazuyuki
National Institute of Polar Research
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ARIMA Makoto
Geological Institute, Yokohama National University
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Hokada Tomokazu
Department Of Geology And Mineralogy Graduate School Of Science Kyoto University
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Arima M
Yokohama National Univ. Yokohama Jpn
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Arima Makoto
Geological Institute Yokohama National University
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Saitoh Tetsu
Geological Institute, Yokohama National University
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Shiraishi Kazuyuki
Department of Crustal Studies, National Institute of Polar Research
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Harmer Robin
Council for Geoscience
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Hokada T
National Inst. Polar Res. Tokyo Jpn
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Saitoh Tetsu
Geological Institute Yokohama National University
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Arima Makoto
Geological Institute Graduate School Of Environment And Information Sciences Yokohama National Unive
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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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