2022 Fiscal Year Final Research Report
Study on hydrothermal copper deposit: Why do porphyry Cu deposits form?
| Project/Area Number |
20K04123
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 17040:Solid earth sciences-related
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| Research Institution | Akita University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
越後 拓也 秋田大学, 国際資源学研究科, 准教授 (30614036)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 斑岩銅鉱床 / 鉱脈型銅鉱床 / 東北日本弧 / 資源探査 / 鉱床成因 |
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| Outline of Final Research Achievements |
Mechanisms of copper concentration and precipitation in porphyry copper deposits and vein-type copper deposits distributed in igneous arcs associated with the subduction of oceanic plates are investigated. In the first year, we collected and prepared samples, and described the minerals that make up the samples. In the second year, we conducted mineralogical and geochemical analyses, and clarified the properties of the hydrothermal fluid that caused the deposits. In the final year, the factors that brought about the concentration and precipitation of copper (the degree of magma oxidation-reduction involved in the ore formation, the dominant sulfur species in hydrothermal fluid, temperature and pressure conditions of the ore-forming fluid, and the composition of oxygen and hydrogen) were investigated. Then the origin of the mineralized fluid was discussed, and the difference in the formation conditions of porphyry copper deposits and vein deposits was clarified.
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| Free Research Field |
鉱床学
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| Academic Significance and Societal Importance of the Research Achievements |
斑岩銅鉱床の形成される地質，地球化学条件が明らかにされ，今後の銅資源探査に応用することができる．得られた結果は，斑岩銅鉱床が天水の循環しない静岩圧下の高温熱水から形成されることが明らかになった．このような地質条件は圧縮応力下の火山弧であり，このような地質条件を満たす地域が今後の資源探査のターゲットとなりうる．
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