GEOCHEMICAL CHARACTERISTICS OF MAFIC DIKE ROCKS FROM THE S∅R RONDANE MOUNTAINS, EAST ANTARCTICA
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概要
- 論文の詳細を見る
Mafic dike rocks (lamprophyre and dolerite) which have been metamorphosed up to amphibolite facies grade intruded Neoproterozoic metamorphic terrains of the S∅r Rondane Mountains. Major and trace element abundance and Sr and Nd isotopic compositions were determined on the mafic dike rocks. The lamprophyre are characterized by extremely high K_2O, P_2O_5,Rb, Ba, Sr, Zr, and light rare earth elements which have minette or lamproite affinity. The geochemical characteristics of lamprophyre and dolerite suggest that these mafic rocks were derived from partial melting of a re-enriched mantle source by mixing of remnant subduction-related materials in the Pan-African orogenic time and a metasomatically enriched mantle. It seems likely that these mafic magmatic activities were related to post orogenic igneous activity in a continental collision zone linked to the Pan-African orogeny.
- 国立極地研究所の論文
著者
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Shiraishi Kazuyuki
National Institute of Polar Research
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KAGAMI Hiroo
Institute for Study of Earth's Interior, Okayama University
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Ikeda Yasuo
Department Of Earth Science Hokkaido University Of Education At Kushiro
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