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Gabbro — quartz diorite inclusions from Izu-Hakone Region, Japan

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Abstract

Gabbro — quartz diorite inclusions, angular to rounded and up to 20 cm in size, have been found as accidental fragments in a mud flow of the Okata basalt group, O-shima Island and in a tuff breccia, Hakone. New analyses are represented for seventeen inclusions and three pyroxenes.

It is reasonable to conclude from petrographic and chemical features that the olivine gabbro inclusions were produced by crystal settling from a quartztholeiite magma at the early stage of fractionation within a magma reservior. On the other hand, gabbro and quartz gabbro inclusions are fragments of a small intrusive body within the Tertiary volcanic formation and consist of various amounts of cumulus phases and liquid. Quartz diorite inclusions are also fragments of a plutonic equivalent, but represents a strongly-differentiated liquid phase of the quartz-tholeiite magma.

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Authors and Affiliations

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

    K. Aoki

  2. Geological Institute, University of Tokyo, Tokyo, Japan

    H. Kuno

Authors
  1. K. Aoki
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  2. H. Kuno
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Aoki, K., Kuno, H. Gabbro — quartz diorite inclusions from Izu-Hakone Region, Japan. Bull Volcanol 36, 164–173 (1972). https://doi.org/10.1007/BF02596988

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  • DOI: https://doi.org/10.1007/BF02596988

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