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2000 Fiscal Year Final Research Report Summary

Generation and reorganization of Oman oceanic crust-mantle

Research Project

Project/Area Number 11691121
Research Category

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

Allocation TypeSingle-year Grants
Section海外学術
Research Field Petrology/Mineralogy/Science of ore deposit
Research Institutionkanazawa University

Principal Investigator

ARAI Shoji  KANAZAWA UNIV, GRAD.SCH.NAT.SCI., PROF., 自然科学研究科, 教授 (20107684)

Co-Investigator(Kenkyū-buntansha) UMINO Susumu  SHIZUOKA UNIV., FAC.SCI., ASSOC.PROF., 理学部, 助教授 (30192511)
TAKAZAWA Eiichi  NIIGATA UNIV., FAC.SCI., ASSOC.PROF., 理学部, 助教授 (80222082)
MIYASHITA Sumio  NIIGATA UNIV., FAC.SCI., PROF., 理学部, 教授 (60200169)
MIZUTA Toshio  AKITA UNIV., FAC.ENG.RES.SCI., PROF., 工学資源学部, 教授 (80094051)
MASUDA Toshiaki  SHIZUOKA UNIV., FAC.SCI., PROF., 理学部, 教授 (30126164)
Project Period (FY) 1999 – 2000
KeywordsOPHIOLITE / OMAN / OCEANIC RIDGE / UPPER MANTLE / CRUST / HYDROTHEMAL ALTERATION / METAMOR PHIC SOLE
Research Abstract

1. We recognized a wide petrographical variation of peridotite, its deformational history, cystallographical change of minerals and origin of mylonites within the upper mantle section of the northern Oman ophiolite. High-PGE chromitite was also discovered.
2. We classified the late-intrusive rocks into three types in terms of petrography. Komatititic extrusives were found associated with picrite basalt, a quench phase of the late intrusives.
3. The segmetation structure of a mid-ocean ridge was estimated by the strutural change of gabbroic layers. Noritic gabbro intruding around the derivative magma chmabers around the segment center impose contact metamorphism of up to granulite facies on surrounding sheeted dike complex. The structure and evolutional history of the roof zone of magma chambers were clarified.
4. The upper lavas can be classified into three groups by high-accuracy chemical analysis of their Cpx phenocrysts, and the genesis was estimated for individual groups. Boninite was newly found. Preliminary data on the Salahi volcanics that erupted at the obuduction stage were presented.
5. Hysrothermal metal mineralization was geologically and geochemically examined to understand its genesis. Reaction between aqueous fluid and chlorite in meta-basalts is of vital importance for their characteristics of Zn and Ni contents. The water/rock ratio in the hydrothermal fluid formation is around 20, that is far higher than the calculated values, 2 to 4.
6. The thermal structure of the ocean-floor metamorphism was examined in basalt to dolerite to confirm a temprature increase downward.
7. The shear sense on the metamorphic sole is NE-SW and the hanging side was confirmed to have moved toward SW.The basic amphibolite of the sole demonstrates variable flow textures within several tens of meters from the contact with overlying ultramafic rocks.

  • Research Products

    (19 results)

All Other

All Publications (19 results)

  • [Publications] 荒井章司: "海洋底およびオフィオライトの深部岩石からみたMORBの成因"月刊地球. 21. 333-338 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Morishita,T.: "Diversity of Carbonate occurrences at the Fish massif in the northern part of the Oman ophiolite"Sci.Rep.Kanazawa Univ.. 43. 13-21 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takazawa,E.: "Polybaric petrogenesis of mafic layers in the Horoman Peridotite Complex, Japan"Jour.Petrol. 40. 1827-1851 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Nam,T.: "In-situ experiments of octachloropropane as a rock analogue"Tectonaphys. 304. 57-70 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Umino,S.: "Subaqueous lava flows obes, observed on ROV KAIKO dives off Hawaii"Geology. 28. 502-506 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ahmed,H.A.: "Petrological Characteristics of the Pan African podiform chromitites and associated peridotites"Mineral.Depasita. 36. 72-84 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Arai, S.: "Origin of MORB deduced from deep-seated rocks from the ocean floor and opiholite."Earth Monthly. 21. 333-338 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Morishita, T., and Arai, S.: "Diversity of carbonate occurrences at the Fizh massif in the northern part of the Oman ophiolite ; a preliminary report."Sci.Rep.Kanazawa University. 43. 13-21 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takazawa, E., Frey, F.A., Shimizu, N., Saal, A.and Obata, M.: "Polybaric petrogenesis of mafic layers in the Horoman Peridotite Complex, Japan."Jour.Petrol.. 40. 1827-1851 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ishikawa, T.and Tera, F.: "Two isotopically distinct fluid components involved in the Mariana arc : Evidence from Nb/B ratios and B, Sr, Nd, and Pb isotope systematics."Geology. 27. 83-86 (1999)

    • Description
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  • [Publications] Masuda, T., Kugimiya, Y., Aoshima, I., Hara, Y.& Ikei, H.A: "statistical approach to determination of a mineral lineation."Jour.Struct.Geol.. 21. 467-472 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nam, T.N., Otoh, S.& Masuda, T.: "In-situ experiments of octachloropropane as a rock analogue : kinetics and energetics of grain growth."Tectonophys.. 304. 57-70 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takazawa, E., Frey, F.A., Shimizu, N.and Obata, M.: "Whole rock compositional variations in an upper mantle peridotite (Horoman, Hokkaido, Japan) : Are they consistent with a partial melting process?"Geochim.Cosmochim.Acta. 64. 695-716 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ishiyama, D., Fuchino T., Mizuta, T., Kaneko, K.and Fujikawa, O.: "Tungsten mineralization of the Ohkawame molybdenite deposit in Kuji City, Iwate Prefecture, Japan."Jour.Mining Coll.Akita Univ., Ser.A. 8. 105-127 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Umino, S., Lipman, P.W.and Obata, S.: "Subaqueous lava flow obes, observed on ROV KAIKO divesoff Hawaii."Geology. 28. 502-506 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Masuda, T., Hiraga, T., Ikei, H., Kanda, H., Kugimiya, Y.& Akizuki, M: "Plastic deformation of quartz at room temperature : a Vickers nano-indentation test."Geophys.Res.Lett.. 27. 2773-2776 (2000)

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      「研究成果報告書概要(欧文)」より
  • [Publications] Michibayashi, K., Gerbert-Gaillard, L.and Nicolas, A.: "Shear sense inversion in the Hilti mantle section (Oman ophiolite) and active mantle uprise."Marine Geophys.Res.. 21. 259-268 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ahmed, A.H., Arai, S., and Attia, A.K.: "Petrological characteristics of the Pan African podiform chromitites and associated peridotites of the Proterozoic ophiolite complexes, Egypt."Mineralium Deposita. 36. 72-84 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Toramaru, A., Takazawa, E., Morishita, T.and Matsukage, K.: "Model of Layering Formation in a Mantle Peridotite (Horoman, Hokkaido Japan)."Earth Planet.Sci.Lett.. (in press). (2001)

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

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Published: 2002-03-26  

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