Sr-Nd Isotope Systematics of Xenoliths in Cenozoic Volcanic Rocks from SW Japan.

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概要

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• Based on new and previously published Sr and Nd isotope data, we examined the petrogenetic relationship between deep crust- and upper mantle-derived xenoliths contained in Cenozoic volcanic rocks and Cretaceous-Paleogene granitoid rocks in SW Japan. The deep crust- and upper mantle-derived mafic to ultramafic xenoliths contained in Cenozoic volcanic rocks from SW Japan have comparable initial Sr and Nd isotope ratios to the Cretaceous-Paleogene granitoid rocks in their respective districts. This may suggest that these xenoliths were genetically related to the Cretaceous-Paleogene granitoid rocks in SW Japan, and that regional variations in Sr and Nd isotope ratios observed in the granitoid rocks are attributed to differences in the geochemistry of the magma sources.

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著者

• KAGAMI Hiroo

  Institute for Study of Earth's Interior, Okayama University

• Nureki Terukazu

  Department Of Earth Sciences Okayama University

• IIZUMI SHIGERU

  Department of Geology and Mineralogy, Tokyo Kyoiku University

• IIZUMI Shigeru

  Department of Geology, Shimane University

• NUREKI Terukazu

  Department of Geological Science, College of Liberal Arts and Sciences, Okayama University

• IWATA Masatoshi

  Institute for Study of the Earth's Interior, Okayama University

• IWATA Masatoshi

  Institute for Study of the Earth's Interior, Okayama University

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• Sr-Nd Isotope Systematics of Xenoliths in Cenozoic Volcanic Rocks from SW Japan.

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