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Petrology and earth scientific analyses for basalts from the Indian Ridge.

Research Project

Project/Area Number 10640460
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Petrology/Mineralogy/Science of ore deposit
Research InstitutionThe University of Tokyo

Principal Investigator

ISHII Teruaki  Ocean Research Institute The University of Tokyo, Associate Professor, 海洋研究所, 助教授 (80111582)

Co-Investigator(Kenkyū-buntansha) SATO Hiroshi  Ocean Research Institute The University of Tokyo, COE Researches, 海洋研究所, COE研究員
KATO Yasuhiro  Faculty of Science Yamaguchi University, Research Associate, 理学部, 助手 (40221882)
Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 1999: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1998: ¥2,500,000 (Direct Cost: ¥2,500,000)
KeywordsIndian Ridge / Rodriguez Triple Junction / MORB / hydrothermal alteration / island-arc / back-arc basin / インド洋海嶺 / 熱水変質玄武岩
Research Abstract

Major and minor element concentrations of fresh to altered basaltic rocks dredged from near the Rodriguez Triple Junction in the Indian Ocean are studied in order to clarify the elemental behavior of these rocks during the hydrothermal alteration at mid-oceanic ridges and low-temperature seafloor weathering. Dredged samples from station #10 of the KH93-3 Cruise are classified into three groups based on the degree of alteration; relatively fresh basalt, altered basalt with a brown secondary mineral, and highly altered chloritized rocks (basalt and dolerite). Whole-rock chemical compositions indicate that the fresh basalt is mid-oceanic ridge basalt (MORB) although only Nb is slightly depleted. Compared to the fresh basalt, altered basalt containing a brown alteration minerals is enriched in K, Rb, and U, suggesting that this type of basalt is subjected to low-temperature seafloor weathering. On the other hand, chloritized rocks show an enrichment of Mn, Mg, Na, Cu, and Zn and a depletion of Ca, K, Co, Rb, Sr, and Ba. These geochemical signatures are likely to have been attributed to an addition of base metals from hydrothermal solutions and to the hydrothermal alteration such as chloritization and albitization by virtue of seawater cycling through oceanic crust at mid-oceanic ridges. Geochemical features of these altered basaltic rocks can be comparable with the geochemical variations of the pillow basalt zone and the transitional zone toward the sheeted dike zone in the IPOD/ODP Hole 504B.
Comparative studies have been also done on the igneous activities and their alteration processes between mid-oceanic ridge systems and island-arc systems with back-arc basins.

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (25 results)

All Other

All Publications (25 results)

  • [Publications] 中村謙太郎: "インド洋中央海嶺ロドリゲス三重会合点における熱水変質玄武岩類の地球化学"資源地質. 49・1. 15-28 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Yoshiro NISHIO: "Volatile element Isotopic Systematics of the Rodrigues Triple Junction Indian Ocean MORB: implications for mantle heterogeneity"Earth and Planetary Science Letters. 170・2. 241-253 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Yasuhiro KATO: "Rare-earth element variations in mid-Archean bawled iron formations: Implications for the chemistry of ocean and continent and plate tectonics"Geochimica et Cosmochimica Acta. 62・21/22. 3475-3497 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 原口 悟: "九州パラオ海嶺北部.駒橋第二海山のトーナライト質深成岩類"月刊地球 (号外). 号外23号. 116-122 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Kantaro FUJIOKA: "Enigmatic extinct spreading center in the West Philippine backare basin unveiled"Geology. 27・12. 1135-1138 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Yoshihiko TAMURA: "Primary arc basalts from Daisen Volcano, Japan: Equilibrium crystal fractionation versus disequilibrium fractionation during supercooling"Journal of Petrology. 41・3. 431-448 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Ohara, Y, and Ishii Y.: "Peridotites form the southern Mariana fore-arc: heterogeneous fluid supply in mantle wedge."The Island arc.. 7. 541-558 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Fryer, P., Fujimoto H., Sekine, M., Johnson, L. E., Kasahara, J., Masuda, H., Gamo, T., Ishii, T., Sriyoshi, M., and Fujioka K: "Volcanoes of the southeastern extension of the active Mariana Island arc : new swath-mapping and geochemical studies."The Island Arc. 7. 596-607 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Kato, Y., Ohta, I., Tsunematsu, T., Watanabe, Y., Isozaki, Y., Maruyama, S., and Imai, N.: "Rare earth element variations in mid-Archean banded iron formations: implications for the chemistry of ocean and continent and plate tectonics."Geochemica Et Cosmochimica Acta. 62. 3475-3497 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Nakamura, K., Kato, Y., and Ishii, T.: "Geochemistry of hydrothermally altered basaltic rocks from the Rodriguez Triple Junction in the Indian Ocean."Shigen Chishitsu. 49 (in Japanese). 15-28 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Nishio, Y., Ishii, T., Gamo, T., and Sano, T.: "Volatile element isotopic systematics of the Rodriguez Triple Junction Indian Ocean MORB : implications for mantle heterogeneity."Earth Planet. Sci. Lett.. 170. 241-253 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Haraguchi, S. and Ishii, T.: "Tonalitic plutonic rocks from the Komahashi-Daini Seamount in the northern Kyushu-Palau Ridge."Gekkan Chikyu. 23 (in Japanese). 116-122 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Fujioka, K., Okino, K., Kanamatsu, T., Ohara, Y., Ishizuka, O., Haraguchi, S., and Ishii, T.: "Enigmatic extinct spreading center in the West Philippine backarc basin unveiled."Geology. 27. 1135-1138

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Tamura, Y., Yuhara, M., and Ishii, T.: "Primary arc basalts from Daisen Volcano, Japan : Equilibrium crystal fractionation versus disequilibrium fractionation during supercooling."Jour. Petrol.. 41. 431-448 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Ishii, T., Sato, H., Haraguchi, S., Taniguchi, H. and Ohara, Y.: "The Southern Mariana trench inner wall-geological cross section of island-arc system with back-arc basin-."EOS, Transactions, AGU. 79, 45. F397-F398 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Ishii. T., Sato, H., Kinoshita, H., Dick, H., and Onboard Scientific Party.: "Geological and petrological studies near ODP Hole 735B, Atlantis-II Fracture Zone ; Initial report of the MODE'98 Leg 4 SHINKAI 6500 dives (including D460)."EOS, Transactions, AGU. 80, 46. F915 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 中村謙太郎: "インド洋中央海嶺ロドリゲス三重会合点における熱水変質玄武岩類の地球化学"資源地質. 49・1. 15-28 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 原口悟: "九州パラオ海嶺北部、駒橋第二海山のトーナライト質深成岩類"月刊地球(号外). 号外23号. 116-122 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Yasuhiro KATO: "Rare-earth element variations in mid-Archean banded iron formations : Implications for the chemistry of ocean and continent and plate tectonics"Geochimica et Cosmochimica Acta. 62・21/22. 3475-3497 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] Kantaro FUJIOKA: "Enigmatic extinct spreading center in the West Philippine backarc basin unveiled"Geology. 27・12. 1135-1138 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Yoshiro NISIO: "Volatile element isotopic systematics of the Rodrigues Triple Junction Indian Ocean MOR1B : implications for mantle heterogeneity"Earth and Planetary Science Letters. 170・2. 241-253 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Yoshihiko TAMURA: "Primary arc basalts from Daisen volcano,Japan : Equilibrium crystal Fractionation versus Disequilibrium Fractionation during super cooling"Journal of Petrology. 41・3. 431-448 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] 中村謙太郎: "インド洋中央海嶺ロドリゲス三重会合点における熱水変質玄武岩類の地球化学" 資源地質. 49・1. 15-28 (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] 原口悟: "九州パラオ海嶺北部,駒橋第二海山のトーナライト質深成岩類" 月刊 地球(号外). 号外23号. 116-122 (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] Yasuhiro KATO: "Rare-carth element variafions Th mid-Archean banded iron formations : Implications for the chemistry of ocean and continent and plate tectonics." Geochimica et Cosmochimica Acta. 62・20. (1998)

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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