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1995 Fiscal Year Final Research Report Summary

The Process of formation of extremely high temperature zones in the deep crust beneath the Miocene Setouchi volcanic province

Research Project

Project/Area Number 05402021
Research Category

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

Allocation TypeSingle-year Grants
Research Field Geology
Research InstitutionEhime University

Principal Investigator

KOMATSU Masayuki  Ehime University, Faculty of Science, Professor, 理学部, 教授 (00018665)

Co-Investigator(Kenkyū-buntansha) TAZAKI Koichi  Ehie University, Faculty of Liberal Arts and Sciences, Professor, 教養部, 教授 (50033262)
SAKAKIBARA Masayuki  Ehime University, Faculty of Science, Associate Professor, 理学部, 助教授 (80202084)
KAWASAKI Toshisuke  Ehime University, Faculty of Science, Professor, 理学部, 教授 (50136363)
Project Period (FY) 1993 – 1995
KeywordsSetouchi Province / Lower crust / Metamorphic xenolith / Magma chamber / Partial melting
Research Abstract

The aim of this project is to investigate the crustal composition and structure, and the influence and nature of magmatic activity based on the research of metamorphic xenoliths enclosed in volcanic rocks and of intermediate and acidic volcanic rocks in the Miocene Setouchi volcanic province.
1. Metamorphic xenoliths were collected from Nijozan (Kinki district), Amataki-yama and Amagiri-yama (Eastern Shikoku), and Kaminada dacite mass and Ishizuchi andesite formation and dikes (Western Shikoku). The xenoliths, except for those from Amagiri-yama, have been thermally metamorphosed and suffered partial melting at the wall of magma chambers which were formed in relatively shallow levels of the crust. The crust was heated to extremely high temperature, causing partial melting of crustal rocks to produce acidic igneous rocks. The original lithology of metamorphic xenoliths varies widely from mafic granulite and high grade pelitic gneisses to mafic and pelitic schists. The xenoliths from Amagiri-yama suffered varied thermal effects depending on the time they were holded in the magma, namely, on the level where they occurred. The crust is infered to consist, from shallow to deep, of Ryoke granite-gneisses, granulite facies gneisses and mylonites, Sanbagawa schists, and high temperature type gneisses.
2. High temperature hornfels of Middle Miocene age have been found to occur in the Sanbagawa schists and revealed that they were formed by extremely high temperature fluid flows. The fluid flow is related to the Setouchi igneous activity, and directly derived from the magma chamber. This proves the shallow magma chamber beneath the Setouchi province.

  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] 小松正幸: "島弧地殻組成構造論の展望" 地質学雑誌. 99. 1011-1024 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 小松正幸: "Prograde and anatectic reactions in deep crustal rocks exposed in the Hidaka belt" Lithos. 33. 31-49 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 小松正幸: "Tectonic evolution of lower crustal rocks of a magmatic arc exposed in the Hidaka belt" The Island Arc. 3. 182-198 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 川嵜智佑: "Anlydious and wisder-satenisted melting oyperinouls of an olivine andesite from Mt.Yakushi-yama" The Island Arc. 2. 228-237 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 榊原正幸: "四国西部三波川帯における中新世の高温ホルンフェルス" 地質学論集. 42. 279-296 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 田崎耕市: "四国北西部中央構造線に沿う酸性火山岩の起源" 地質学論集. 42. 267-278 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] KOMATSU,M.: "Composition and structure of the island arc crust : a review" Jour.Geol.Soc.Japan. 99-12. 1011-1024 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] KOMATSU,M., TOYOSHIMA,T., OSANAI,Y.AND ARAI,M.: "Prograde and anatectic reactions in deep crustal rocks exposed in the Hidaka metamorphic belt, Japan" Lithos. 33-1. 31-49 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] TOYOSHIMA T,KOMATSU,M.AND SHIMURA,T.: "Tectonic evolution of lower crustal rocks of a magmatic arc exposed in the Hidaka belt" The Island Arc. 3-3. 182-198 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] KAWASAKI,T., OKUSAKO,H.and NISHIYAMA,T.: "Anhydrous and water-saturated melting rxperiments of an olivine andesite from Mt.Yakushi-yama, northeastern Shikoku" The Island Arc. 2-4. 228-237 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] KAWASAKI,T.: "Olivine-clinopyroxene equilibrium relation in the system of CaO-FeO-MgO-SiO2" Jishin. 47. 443-451 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] SAKAKIBARA,M., KOMATSU,M., TAKAHASHI,M., OSANAI,Y.and ITAYA,T.: "Miocene thermal metamorphism in the Sanbarawa schists, western Shikoku" Memoir Geol Soc.Japan. 42. 279-296 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] TAZAKI,K., KAGAMI,H., ITAYA,T.and NAGAO,T.: "Origin of acidic rocks along the Median Tectonic Line in northwestern part of Shikoku" Memoir Geol Soc.Japan. 42. 267-278 (1993)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1997-03-04  

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