Geochemistry of syenite of the Phalaborwa Carbonatite Complex, South Africa
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概要
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We surveyed the Spitskop syenite pipe,one of the satellite bodies of the Phalaborwa Carbonatite Complex located in northeastern Transvaal,South Africa. This pipe is composed of the inner cumulus syenite and outer ring syenite.The brecciation zone between these syenites includes many blocks of syenite,pyroxenite, melanocratic rock,biotite gneiss and granitic rocks.Dolerite dykes intruded into the plug and brecciation zone.Fine-and coarse-grained syenites,melanocratic rock, alkali-feldspar granite and dolerite were collected from the brecciation zone of this pipe.The whole-rock and mineral chemistry suggests that syenites and melanocratic rocks of the brecciation zone were derived from the inner cumulus syenite magma. These rocks do not indicate any clear isochron.It may be a result of mixing of various rocks at the brecciation stage.
- 国立極地研究所の論文
著者
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KOHNO Mika
National Institute of Polar Research
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Hiroi Yoshikuni
Department of Earth Sciences, Faculty of Science, Chiba University
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Kagami Hiroo
Graduate School of Science and Technology, Niigata University
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Yuhara Masaki
Department Of Earth System Science Faculty Of Science Fukuoka University
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TSUCHIYA Noriyoshi
Department of Resources Engineering, Faculty of Engineering, Tohoku University
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Tsuchiya Noriyoshi
Department Of Geoscience And Technology Graduate School Of Engineering Tohoku University
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Kagami Hiroo
Graduate School Of Natural Science And Technology Niigata University
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Hiroi Yoshikuni
Department Of Earth Sciences Chiba University
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Hiroi Yoshikuni
Department Of Earth Sciences Faculty Of Science Chiba University
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Yuhara Masaaki
Department of Earth System Science, Faculty of Science, Fukuoka University
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Tsuchiya Noriyoshi
Department of Geoscience and Technology, Graduate School of Engineering, Tohoku University
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