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Sulphide and oxide minerals from the Ohmine granitic rocks in Kii Peninsula, central Japan, and their primary paragenetic relations

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Abstract

In the Ohmine granitic rocks of Kii Peninsula, central Japan, ilmenite, rutile, pyrrhotite, pyrite and chalcopyrite commonly occur, but no magnetite is present. Their primary paragenetic relations were confirmed by examining their mode of occurrences as inclusion species in major silicate minerals and the phase relations in the Cu-Fe-S system, though their parageneses changed in cooling of the rocks. This makes it possible to estimate the fugacities of oxygen and sulfur in the granitic rocks based upon their paragenetic relations, and to discuss the nature of volatiles in the granitic rocks.

Significant subsolidus reactions for sulfide minerals continued until the rocks cooled below 300° C and took place in two types of mineral grains, in groundmass and as inclusions. The removal of sulfur and copper through the silicate crystals was too easy to preserve the chemistry of sulfides included in silicates.

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Author notes

  1. Tetsumaru Itaya

    Present address: Geology Department, The University of Auckland, Private Bag, Auckland, New Zealand

Authors and Affiliations

  1. Institute of Petrology, Mineralogy and Economic Geology, Tohoku University, 980, Sendai, Japan

    Mamoru Murata & Yoshio Ueda

  2. Hiruzen Research Institute, Okayama University of Science, Kawakami-son, Maniwa-gun, 717-06, Okayama, Japan

    Tetsumaru Itaya

Authors
  1. Mamoru Murata
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  2. Tetsumaru Itaya
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  3. Yoshio Ueda
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Murata, M., Itaya, T. & Ueda, Y. Sulphide and oxide minerals from the Ohmine granitic rocks in Kii Peninsula, central Japan, and their primary paragenetic relations. Contr. Mineral. and Petrol. 84, 58–65 (1983). https://doi.org/10.1007/BF01132330

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  • DOI: https://doi.org/10.1007/BF01132330

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