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Oxygen isotopic study of the Cretaceous granitic rocks in Japan

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Abstract

The (δ 18O values of nine Cretaceous granitic rocks from the low P/T type regional metamorphic zone of Japan are +10.0 to +13.2‰ relative to SMOW, while ten Cretaceous granitic rocks from the non-metamorphic zone are +7.9 to +9.8‰. The 18O-enrichment in the former rocks is mainly attributed to oxygen isotopic exchange between the granitic magma and the surrounding metamorphic rocks during regional metamorphism. The assimilation of 18O-rich country rocks is also possible in the cases such as gneissose granite and migmatite.

The oxygen isotopic ratios of quartz-biotite pairs in the granitic rocks indicate that they are isotopically in near-equilibrium with each other. The quartz-biotite isotopic equilibrium temperatures estimated for these rocks range from 550° to 670° C. Feldspar is occasionally isotopically in disequilibrium with other minerals. This may be caused by exchange of oxygen isotopes between feldspar and hydrothermal or meteoric water after crystallization.

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Author notes

  1. Y. Matsuhisa

    Present address: Geological Survey of Japan, 8 Kawada-cho, Shinjuku-ku, Tokyo, Japan

Authors and Affiliations

  1. Department of Geology and Mineralogy, Tokyo Kyoiku University, Otsuka, Bunkyo-ku, Tokyo, Japan

    Y. Matsuhisa

  2. Institute for Thermal Spring Research, Okayama University, Misasa, Tottori-ken, Japan

    H. Honma, O. Matsubaya & H. Sakai

Authors
  1. Y. Matsuhisa
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  2. H. Honma
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  3. O. Matsubaya
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  4. H. Sakai
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Matsuhisa, Y., Honma, H., Matsubaya, O. et al. Oxygen isotopic study of the Cretaceous granitic rocks in Japan. Contr. Mineral. and Petrol. 37, 65–74 (1972). https://doi.org/10.1007/BF00377307

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  • DOI: https://doi.org/10.1007/BF00377307

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