神居古潭帯に産するオフィオライト質岩類のSr同位体的性質について(<特集>日本列島のオフィオライト-地団研第31回総会テーマ別討論会-)

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概要

• 論文の詳細を見る

• Rb and Sr contents and Sr isotopic ratios were determined for the ophiolitic rocks in the Kamuikotan Zone, Hokkaido. The initial ratios of these rocks are asfollows; Sorachi Group basic rocks (0.7019-0.7045), ultrabasic rocks (dunite, harzburgite and serpentinite) (0.7069-0.7113), olivine clinopyroxenites (0.7037-0.7103), microdiorites (0.7039-0.7054), rodingite (0.7038), quartz albitite (0.7048), amphibolitic rocks (0.7032-0.7053), and trondhjemites (0.7028-0.7052). The genetical relationship between the Sorachi Group basic rocks and the associated ultrabasic rocks can be explained by considering them as the complementary products formed by partial melting of certain lherzolitic mantle material, which is composed of various minerals with different Sr contents and Sr isotopic ratios. It seems plausible to consider that the dike rocks such as olivine clinopyroxenite, microdiorite and gabbroic pegmatite were formed from the liquids trapped within the hot residual mantle diapir.

• 地学団体研究会の論文
• 1978-11-25

著者

• 宮城 晴耕

  東京都立北園高等学校

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• 神居古潭帯に産するオフィオライト質岩類のSr同位体的性質について(日本列島のオフィオライト-地団研第31回総会テーマ別討論会-)

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