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1994 Fiscal Year Final Research Report Summary

MICROSCALE ISOTOPIC STUDY OF FLUID MIGRATION DURING METAMORPHISM.

Research Project

Project/Area Number 05640549
Research Category

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

Allocation TypeSingle-year Grants
Research Field 地球化学
Research InstitutionSHIZUOKA UNIVERSITY

Principal Investigator

WADA Hideki  SHIZUOKA UNIVERSITY,FACULTY OF SCIENCE,ASSOCIATE PROFESSOR, 理学部, 助教授 (20126791)

Co-Investigator(Kenkyū-buntansha) MASUDA Toshiaki  SHIZUOKA UNIVERSITY,FACULTY OF SCIENCE,ASSOCIATE PROFESSOR, 理学部, 助教授 (30126164)
Project Period (FY) 1993 – 1994
KeywordsSTABLE ISOTOPE ZONATION / GRAPHITE-CALCITE / GRANULITE FACIES / WATER-ROCK INTERACTION / GRAPHITE PRECIPITATION
Research Abstract

Isotopic characterization of graphite and calcite in various associations from the granulite facies supracrustal terrance of southern Kerala provide valuable information on fluid processes in the continental lower crust. From carbon isotope signature, I clearly distinguish two categories of graphites : one derived from biogenic sources through the conversion of organic matter trapped within sediments and the other precipitatioed from magmatically derived CO_2 rich fluids. Graphites associated with incipient charnockites and those filling mesoscopic sheares and faults represent crystallization from isotopically homogenous CO_2 rich fluids which were derived from sublithospheric magmas and which propagated by hydraulic fracturing, forming an interconnected structurally controlled fluid network. Extermal fluid ingress is also borne out by the carbon and oxygen isotopic compositions of calcite from calc-silicates. On ther other hand, the marked isotopic zonations on a micrometer scale displayd by single crystals of graphite from pegmatities indicate slow crystallization from isolated fluid-filled pockets.
In the lower crust, carbon dioxide and water will move through fractures and the grain boundaries. I proposed the mechanism which clealy showed the different behavior of carbon dioxide and water in the chemical fronts of a contact metamorphic terrance. Carbon normally migrates as CO_2, or CO_3 form through lattice diffusion, but oxygen can migrate through grain boundary as water molecules for a long distances. This showed the most important factors of such different behavior is caused the ionic radii or the size of the chemical forms.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] Radhika UP. Santesh M. WADA H: "Grapite occurreniesin southein Kerala.characteristics and genesis" Jour. Geol. Soc. India,. 34. 159-170 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Santoch M. WADA. H.: "Microscaleisofopic ronsation in graphite oryatals Eoideue for chauneled Dringlux in granulites" Earth&Plauetary Scieuce Letters. 119. 19-26 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Sautosh M.Wada H: "A carton isotopestudy of graphites from the Kerale Khondalite belt Sowthem I waliai euideuce for CO_2 infiltatron in graulites" Jounal of geology. 101. 643-651 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Wada H&Ando T: "The role of grain bowdany at cheuical and isotopic fronts in manulelo durint ionfaet watamorphism nicroscalo isotope roing" Mineralogical Magarine. 58A. 947-948 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] WADA H, Tomita, T, Matsuura, K. Iuchi K. Ito M. Morikiyo: "grashitiratior of canbouaceon wattcr dunig metamorplinsn with repcrence to carbonate and pelitio rocks of contact and regiouag ineta" Contrbontion to Mineralogy iud Petrology. 118. 217-228 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Wada H&Satosh M: "Stable isotopic characterination of mefamorphicfhid processes in the kerela khonkalite Belt south Judia" Geologieal Society of India,Memoir,. 34. 159-170 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Radhika U.P., Santosh M.and Wada H.(1995): "Graphite occurrences in southern Kerala : characteristics and genesis" Jour.Geol.Soc.India.v.34. 159-170 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Wada H., Tomida T., Matsuura K., Iuchi K., Ito M.and morikiyo T.: "Graphitization of carbonaceous matter during metamorphism with references to carbonate and pelitic rocks of contact and regional metamorphisms, Japan." Contrib.Mineral.Petrol.v.118. 217-228 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Kagi, I.Tsuchida, M.Wakatsuki, K.Takahashi, N.Kaminura, K.Iuchi, and H.Wada: "Proper understanding of down-shifted Raman spectra of natural graphite ; Direct estimation of laser-induced rise in sample temperature." Geochim.cosmochim.Acta.58. 3527-3530 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Wada H.and Ando T.: "The role of the grain boundary at chemical and isotopic frants in marble during contact metamorphism : microscale isotopic zoning in calcite." Mineralogical Magazine. 58A. 947-948 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Santosh M.and Wada H.: "Micaroscale isotopic zonation in graphite crystals : Evidence for channelled CO_2 influx in granulites." Earth and Planetary Science Letters. 119 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Santosh M.and Wada H.: "A carbon isotope study of graphites from the Kerala Khondalite belt, Southern India : Evidence for CO_2 infiltration in granulites." The Journal of Geology. 101 (1993)

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

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Published: 1996-04-15  

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