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- W2037322453 startingPage "201" @default.
- W2037322453 abstract "18O/16O ratios were analyzed for 14 granitic rocks and their constituent minerals of the Ibaragi granitic complex near Osaka which is composed of the Nosé pluton and the Myoken pluton. The whole-rock δ18O values of the Nosé pluton are in the range from +8.1 to +9.7‰ relative to SMOW. The data for the coexisting minerals suggest that an oxygen isotope equilibrium has been attained among the minerals. The δ18O values of the Myoken pluton are remarkably lower than those of the Nosé pluton. This indicates that the magmas of the two plutons are different in their origins and/or differentiation processes. In the Nosé pluton, the 18O-enrichment of about 1.5‰ is recognized in the differentiation sequence from quartz diorite to adamellite. This isotope variation can be explained as the results of equilibrium fractionation in a crystallizing magma. The δ18O value of the initial magma of the Nosé pluton is estimated to be around +7.5 ‰. Somewhat 18O-enriched materials such as metamorphic basic rocks, rather than the fresh upper mantle materials, are likely to be the source of the 18O-rich dioritic magma. In the Ibaragi granitic complex, no appreciable change in oxygen isotopes is observed in the contact zone as compared to the values of main intrusive body, possibly because the country rocks have isotope ratios similar to those of the granitic rocks. An exception is found in the marginal zone of the Myoken pluton and the dike rocks, where K-feldspar may have exchanged its oxygen with the circulating low-18O meteoric ground water." @default.
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- W2037322453 date "1973-01-01" @default.
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- W2037322453 title "Oxygen isotope study of the Ibaragi granitic complex, Osaka, southwest Japan" @default.
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- W2037322453 doi "https://doi.org/10.2343/geochemj.7.201" @default.
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