1989 Fiscal Year Final Research Report Summary
GEOLOGICAL AND PETROLOGICAL STUDY ON MAGNESIAN ANDESITES IN ISLAND ARC
| Project/Area Number |
61302027
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| Research Category |
Grant-in-Aid for Co-operative Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
地質学一般
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| Research Institution | Yamaguchi University |
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Principal Investigator |
SHIRAKI Keiichi Yamaguchi University, Associate Professor, 理学部, 助教授 (60144911)
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| Co-Investigator(Kenkyū-buntansha) |
MARUYAMA Shigenori University of Tokyo, Associate Professor, 教養学部, 助教授 (50111737)
KURODA Naoshi Shizuoka University, Professor, 理学部, 教授 (60021903)
URANO Hayaomi Aichi University of Education, Professor, 二部, 教授 (50023990)
NAGAO Takashi Yamaguchi University, Associate Professor, 理学部, 助教授 (40136164)
MATSUMOTO Yukio Yamaguchi University, Professor, 理学部, 教授 (30039763)
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| Project Period (FY) |
1986 – 1988
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| Keywords | Andesite / Magnesian andesite / Boninite / Sanukite / Island arc / Bonin Islands / Setouchi volcanic rocks / Pyroxene |
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| Research Abstract |
1. Study on Bonin Island boninites. Shiraki and co-worker discovered the most Mg-rich, clinoenstatite boninites in Takinoura, Ani-jima. This contains the most Fo- and NiO-rich olivine in the boninites, and the partition coefficient of Ni between olivine and liquid revealed a high value of 12. Maruyama et al. compiled the geology of Ani-jima. Kuroda and co-investigator published a petrological study on ferropigeonite-bearing dacites, which are the latest differentiates from boninite-forming magma.
2. Study on sanukites and related rocks in the Setouchi volcanic belt. Shiraki et al. discovered a large number of magnesian andesites in southeastern Yamaguchi Prefecture and carried out detailed geological, petrological, minetalogical and geochemical studies on them. Shiraki and Nomura reported a magnesian andesite from the lower Miocene Hachiya formation in Minokamo-shi, Gifu Prefecture.
3. Study on magnesian andesitet from other region. Shiraki et al. and Shijo and Kato described Magnesian andesites from Iriomote-jima and Kume-jima, Ryukyu Islands, respectively. Nanao and Sakaguchi found magnesian andesites in primitive magmas of the Hisatsu volcanic rocks. Takahashi discovered magnesian andesites in the base of the Nishina group in Izu Peninsula. Magnesian andesites in the Japan Sea side were described by Furuyama, Sato et al. and Okamura and Yosida, respectively.
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Research Products
(14 results)
