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2002 Fiscal Year Final Research Report Summary

Behavior of volatile components and mechanism of ore formation in the magmatic-hydrothermal system

Research Project

Project/Area Number 12440143
Research Category

Grant-in-Aid for Scientific Research (B)

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

Principal Investigator

HAYASHI Ken-ichiro  Tohoku University, Graduate School of Science, Associate professor, 大学院・理学研究科, 助教授 (40124614)

Co-Investigator(Kenkyū-buntansha) KAKEGAWA Takeshi  Tohoku University, Graduate School of Science Associate professor, 大学院・理学研究科, 助教授 (60250669)
Project Period (FY) 2000 – 2002
Keywordshydrothermal deposit / magmatic water / oxygen isotope / fluid inclusion / metamorphosed ore deposit / skarn
Research Abstract

During the solidification of hydrous granitic magma, water of very high salinity separates from the magma. The magmatic water contains volatile components such as CO_2 and H_2S. Since concentration of dissolved metallic ions in magmatic water is rather high, it behaves as an ore-forming solution. In this study, ore deposits that have genetical relation with magmatic water are studied.
The skarn-type magnetite deposit at the Beni Bou Ifrour mine, northeastem Morocco, is the one of the major iron deposits in northern Africa. The skarn ore develops between limestone and microgranodioritic intrusions. The genetical relationship between skarn and granodiorite has been argued. The result of K-Ar dating shows that age of skarn mineral is approximately same as that of granodiorite; this agreement suggests ore-forming solution of this deposit was magmatic water that derived from granodiorite. Data obtained from fluid inclusions show very high temperature, 〜500℃, and very high salinity, 〜75 wt% equivalent NaCl. Oxygen isotope values of skarn minerals suggest that water of magmatic origin precipitated skarn minerals. Therefore, magmatic water of high temperature and high salinity was responsible for the transport of large amount of iron during the formation of magnetite deposit.
Oxygen isotope values of manganese silicate minerals from the metamorphosed bedded type manganese deposit at the Noda-Tamagawa mine, northeastern Japan, were analyzed. Since this manganese deposit is hosted in the roofpendant just above the granitic body, evidence of magmatic water probably recorded in manganese minerals. However, oxygen isotopic equilibrium has not been attained among manganese minerals of closely associated. This suggests that amount of metamorphic fluid during contact metamorphism has been very small.

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] El Rhazi, M.: "Mineralogy, geochemistry, and age constraints on the Bern Bou Ifrour skarn type magnetite deposit, northeastern Morocco"Resource Geology. 52. 25-39 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yoshida, T.: "Dissolution of iron hydroxides by marine bacterial siderophore"Chemical Geology. 184. 1-9 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hayashi, K.: "Oxygen isotope study of metamorphosed manganese deposit of the Noda-Tamagawa mine, northeast Japan"Economic Geology. 98. 181-189 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kojima, S.: "Ore mineralogy fluid inclusion, and stable isotopic characteristics of stratiform copper deposits in the coastal Cordillera of northern Chile"Mineralium Deposita. 38. 208-216 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] El Rhazi,M and Hayashi,K.: "Mineralogy, geochemistry, and age constraints on the Beni Bou Ifrour skarn type magnetite deposit, northeastern Morocco"Resource Geology. 52. 25-39 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yoshida,T., Hayashi,K. and Ohmoto,H.: "Dissolution of iron hydroxides by marine bacterial siderophore"Chemical Geology. 184. 1-9 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hayashi,K. and El Rhazi,M.: "Oxygen isotope study of metamorphosed manganese deposit of the Noda-Tamagawa mine, northeastern Japan"Economic Geology. 98. 181-189 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kojima,S., Trista,D. and Hayashi,K.: "Ore mineralogy, fluid inclusion, and stable isotope characteristics of the stratiform copper deposits in the coastal Cordillera of northern Chile."Mineralium Deposita. 38. 208-216 (2003)

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

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Published: 2004-04-14  

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