| Project/Area Number |
20840035
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| Research Category |
Grant-in-Aid for Young Scientists (Start-up)
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| Allocation Type | Single-year Grants |
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| Research Field |
Petrology/Mineralogy/Science of ore deposit
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| Research Institution | Kyushu University |
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Principal Investigator |
UTSUNOMIYA Satoshi Kyushu University, 大学院・理学研究院, 准教授 (40452792)
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| Project Period (FY) |
2008 – 2009
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| Project Status |
Completed (Fiscal Year 2009)
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| Budget Amount *help |
¥3,276,000 (Direct Cost: ¥2,520,000、Indirect Cost: ¥756,000)
Fiscal Year 2009: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2008: ¥1,716,000 (Direct Cost: ¥1,320,000、Indirect Cost: ¥396,000)
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| Keywords | パイライト / TEM / arsenian pyrite / Carlin-type deposit / Nano-scale / Toxic metals |
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| Research Abstract |
Arsenian pyrite is an important host of Au in the Carlin-type deposit, whereas it always contains significant amount of heavy metals. In order to understand the formation process and the impact to the ambient environment, a detailed examination utilizing a variety of electron microscopy techniques was carried out on the arsenian pyrite collected from various epithermal deposits. New type of arsenian pyrite that contains As^<3+> was characterized in the sample from the Yanacocha deposit. The amounts of defect and the content of other toxic metals increases as the particle size decreases to nanometer size <10 nm. The other finding is a decoupled formation of As and Cu rich pyrite, indicating mixing of two distinct fluid conditions during its formation. In addition, an experimental study revealed the specific As-bearing minerals in the interaction between mackinawite and aqueous As under anoxic condition. Consequently, this project successfully covered a wide range of crystallochemical characteristics of pyrite in the ore deposit.
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