Sr-Nd isotope systematics of xenoliths in Cenozoic volcanic rocks from SW Japan

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Authors:Kagami, Hiroo; Iizumi, Shigeru; Iwata, Masatoshi; Nureki, Terukazu
Author Affiliations:Primary:
Shimane University, Department of Geology, Matsue, Japan
Other:
Okayama University, Japan
Volume Title:Proceedings of the Japan Academy. Series B: Physical and Biological Sciences
Source:Proceedings of the Japan Academy. Series B: Physical and Biological Sciences, 69(1), p.1-6. Publisher: Japan Academy, Tokyo, Japan. ISSN: 0386-2208
Publication Date:1993
Note:In English. 20 refs.; illus. incl. sketch map
Summary:Based on new and previously published Sr and Nd isotope data, the petrogenetic relationship between deep crust- and upper mantle-derived xenoliths contained in Cainozoic volcanic rocks and Cretaceous-Palaeogene granitic rocks in SW Japan were examined. The deep crust- and upper mantle-derived mafic to ultramafic xenoliths have comparable initial Sr and Nd isotope ratios to the Cretaceous-Palaeogene granitic rocks in their respective districts. This may suggest that these xenoliths were genetically related to the Cretaceous-Palaeogene granitic rocks in SW Japan, and that regional variations in Sr and Nd isotope ratios observed in the granitic rocks are attributed to differences in the geochemistry of the magma sources. [E.O.]
Subjects:Absolute age; Alkaline earth metals; Cenozoic; Dates; Igneous rocks; Inclusions; Isotope ratios; Isotopes; Metals; Miocene; Nd-144/Nd-143; Neodymium; Neogene; Rare earths; Sr-87/Sr-86; Sr/Sr; Stable isotopes; Strontium; Tertiary; Volcanic rocks; Xenoliths; Asia; Far East; Japan; Shikoku; Washinoyama
Abstract Numbers:98M/2799
Record ID:1993020815
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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