GEOCHEMICAL CHARACTERISTICS OF MAFIC DIKE ROCKS FROM THE SØR RONDANE MOUNTAINS, EAST ANTARCTICA

P(論文) Mafic dike rocks (lamprophyre and dolerite) which have been metamorphosed up to amphibolite facies grade intruded Neoproterozoic metamorphic terrains of the Sør Rondane Mountains. Major and trace element abundance and Sr and Nd isotopic compositions were determined on the mafic dike rocks. The...

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Bibliographic Details
Main Authors: イケダ, ヤスオ, シライシ, カズユキ, カガミ, ヒロオ, IKEDA, Yasuo, SHIRAISHI, Kazuyuki, KAGAMI, Hiroo
Language:English
Published: National Institute of Polar Research 1995
Subjects:
Online Access:https://nipr.repo.nii.ac.jp/record/2785/files/KJ00002368415.pdf
https://doi.org/10.15094/00002785
https://nipr.repo.nii.ac.jp/records/2785
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Summary:P(論文) Mafic dike rocks (lamprophyre and dolerite) which have been metamorphosed up to amphibolite facies grade intruded Neoproterozoic metamorphic terrains of the Sør 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. departmental bulletin paper