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1990 Fiscal Year Final Research Report Summary

Study on the Tertiary Volcanic Rocks in the Izu-Mariana Arc

Research Project

Project/Area Number 01540660
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 鉱物学(含岩石・鉱床学)
Research InstitutionYamaguchi University

Principal Investigator

SHIRAKI Keiichi  Yamaguchi Univ., Sci., Assoc. Prof., 理学部, 教授 (60144911)

Co-Investigator(Kenkyū-buntansha) NAGAO Takashi  Yamaguchi Univ., Sci., Assoc. Prof., 理学部, 助教授 (40136164)
MATSUMOTO Yukio  Yamaguchi Univ., Sci., Professor, 理学部, 助教授 (30039763)
Project Period (FY) 1989 – 1990
KeywordsVolcanic rocks / Andesite / Boninite / Sanukite / Island arc / Izu-Mariana arc / Bonin Islands / Setouchi volcanic belt
Research Abstract

1. Study on the Tertiary volcanic rocks in the Bonin Islands.
(1) Sheeted dike complex at Ishi-ura on the east coast of Chichi-jima.
The dikes and associated pillow lavas are composed mainly of clioenstatite-bearing boninites, which are the most primitive and undifferentiated among the Bonin Island boninites. This confirms the early suggestion that the parallel dike swarm on Ishi-ura, located at the lowest of the pillow lava sequences in Chichi-jima, represents a part of the sheeted dike complex common in many ophiolites.
(2) Augite boninites in the Tatsumiwan area of southeastern Chichi-jima.
The augite boninites contain augite phenocrysts attaining the highest Mg value 89.3, most magnesian so far reported from the Bonin Island boninites. These rocks crystallized augite prior to orthopytoxene and belong to cpx-HMA, which is the first discovery from the Bonin Island boninites.
(3) Island arc tholeiites similar to those occurring in Haha-jima in chemistry were discovered on John Beach in southwestern Chichi-jima.
2. Comparative study on boninites and other magnesian andesites.
(1) Trace elements in the Tertiary volcanic rocks from western Setonaikai.
The Setouchi magnesium andesites have remarkably high Rb, while Sr is rather low. The Setouchi volcanic rocks form by addition of water containing Rb, K, Ba and Zr, as well as boninites.
(2) Sanukitoids quite identical with the Setouchi sanukitoids in chemical and mineral compositions were discovered in Choshi of eastern Honshu Nagasaki of western Kyushu.

  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] 白木 敬一: "瀬戸内海西部の瀬戸内火山岩:微量元素の特徴" 岩石鉱物鉱床学会誌.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 白木 敬一: "小到原諸島兄島の単斜頑大輝石無人岩" 日本の高マグネシア安山岩. 41-46 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 白木 敬一: "琉球列島西表島の高マグネシア安山岩" 日本の高マグネシア安山岩. 53-58 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 白木 敬一: "山口県八島・祝島の火山岩" 日本の高マグネシア安山岩. 75-89 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 白木 敬一: "山口県平郡島および室津半島の火山岩" 日本の高マグネシア安山岩. 91-105 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 白木 敬一: "山口県周防大島の高マグネシア安山岩" 日本の高マグネシア安山岩. 107-117 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 白木 敬一(編著): "日本の高マグネシア安山岩" 山口大学, 222 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shiraki, K.: "Some aspects of the magnesian andesites." Magnesian andesites in Japan. 5-25 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shiraki, K.: "A clinoenstatite boninite from Ani-jima, Bonin Islands." Magnesian andesites in Japan. 41-46 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shiraki, K.: "Centenary of boninite." Magnesian andesites in Japan. 47-51 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shiraki, K.: "Magnesian andsite in Iriomote-jima, Ryukyu Islands." Magnesian andesites in Japan. 53-58 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shiraki, K.: "Volcanic rocks in Ya-shima and Iwaijima Islands, Yamaguchi-ken." Magnesian andesites in Japan. 75-89 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shiraki, K.: "Volcanic rocks Heigun-to Island and Murotsu Peninsula, Yamahuchi-ken." Magnesian andesites in Japan. 91-105 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shiraki, K.: "Magnesian andesites in Suo-Ohshima Island, Yamaguchi-ken." Magnesian andesites in Japan. 107-117 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shiraki, K.: "A magnesian andesite from the Lower Miocene Hachiya formation in Minokamo-shi, Gifu-ken." Magnesian andesites in Japan. 143-148 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shiraki, K.: "An electron probe study on a magnesian andesite from White Island, New Zealand." Magnesian andesites in Japan. 219-222 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kakubuchi, S.: "Quantitative analysis of the trace elements in silicate rocks by X-ray fluorescence method." Sci. Rep., Liberal Arts, Yamaguchi Univ.23. 43-54

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  • [Publications] Shiraki, K. (ed): Yamaguchi Univ.Magnesian Andesites in Japan., 222 (1989)

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Published: 1993-08-12  

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