1999 Fiscal Year Final Research Report Summary
Characteristies and time-spatial analysis of epitharmal Au-Ag mineralization and acid-sulfate alteratin
Project/Area Number |
09640561
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Single-year Grants |
Section | 一般 |
Research Field |
Petrology/Mineralogy/Science of ore deposit
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Research Institution | HOKKAIDO UNIVERSITY |
Principal Investigator |
MATSUEDA Hiroharu Hokkaido Univ.The Hokkaido Univ. Mareum ; Pro., 総合博物館, 教授 (20108921)
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Co-Investigator(Kenkyū-buntansha) |
ISHIYAMA Daigo Akita Univ.Fac. of Eng.Res., Asso.Pro., 工学資源学部, 助教授 (30193361)
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Project Period (FY) |
1997 – 1999
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Keywords | Epithermal / Au-Ag mineraligation / Acid-sulfate alteration / Time-spatial analysis / Fluid inclusion / Stable isotope / K-Ar age |
Research Abstract |
On the genesis and formation process of the epithermal Au-Ag deposits related to young volcanic activities in the island arc geologic environ- ment, it is investigated to clarify the formation environment and con- centration process of the elements from the viewpoints of ore geology, geochemistry and petrology based on the field and laboratory works. Basic experiments are also conducted in order to improve and obtain high accuracy in chemical analyses. Both low- and high-sulfidation types of gold mineralizations in epi- and meso-thermal conditions are investigated on their assemblages of ore and alteration minerals to determine the physicochemical conditions and time-spatial relationships of the both types. Study fields are also extended to the same types in northeast Japan and Indonesia to make comparative study. As a concluding remarks, it is clarified that the high-sulfidation type gold mineralization is stongly affected by the magmatic fluids, but the low-sulfidations is by meteoric water. The former is prior to the latter and is located closer to the intrusive rock. Both types of gold mineralizations are strongly related to the magmatic acitivity, and the originated high temperature fluids dissolving various metals in the style of sulfide complexes might have effectively precipitated them due to the boiling by pressure decrease and/or mixing with meteoric water to cause cooling, oxidation or dilution in shallow environment.
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Research Products
(38 results)
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[Publications] Maglambayan,V.B., Ishiyama,D.,Mizuta,T., Imai,A. & Ishikama,Y.: "Geology, mineralogy, and formation environment of the disseminated gold-silver telluried Bulawan deposit, Negros Occidental, Philippine"Resour.Geol.. 48. 87-104 (1998)
Description
「研究成果報告書概要(和文)」より
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[Publications] Hida,T.,Ishiyama,D.,Mizuta,T.& Takada,J.: "Geological and petrochemical significance of acidic rocks around the Yano-Shokozan pyrophyilite deposits, Shobara, Hiroshima Prefecture, Japan."Jour.Mining Coll.Akita Univ., Ser.A. 8. 69-94 (1998)
Description
「研究成果報告書概要(和文)」より
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[Publications] Maglambayan, V.B., Ishiyama, D., Mizuta, T., Imai, A.and Ishikawa, Y.: "Geology, mineralogy, and formation environment of the disseminated gold-silver telluride Bulawan deposit, Negros Occidental, Philippines."Resour.Geol.. Vol. 48. 87-104 (1998)
Description
「研究成果報告書概要(欧文)」より
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[Publications] Ishiyama, D., Nomiyama, K., Mizuta, T., Matsubaya, O.& Sato, M.: "Characteristic features of fluid associated with magma/carbonate-rock interaction at the Kamineichi dolomitic skarns in the contact aureole of the Miyako granitic body, Iwate Prefecture, Japan. (in Japanese)"Resour.Geol.. 48(2). 61-76 (1998)
Description
「研究成果報告書概要(欧文)」より
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[Publications] Hida, T., Ishiyama, D., Mizuta, T.and Takada, J.: "Geological and petrochemical significance of acidic rocks around the Yano-Shokozan pyrophyllite deposits, Shobara, Hiroshima Prefecture, Japan."Jour.Mining Coll.Akita Univ., Ser.A.. Vol.8, No.2. 69-94 (1998)
Description
「研究成果報告書概要(欧文)」より
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