| Project/Area Number |
22K14633
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 31020:Earth resource engineering, Energy sciences-related
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| Research Institution | Akita University |
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Principal Investigator |
Manalo Pearlyn 秋田大学, 国際資源学研究科, 助教 (50895480)
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| Project Period (FY) |
2022-04-01 – 2025-03-31
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| Project Status |
Granted (Fiscal Year 2023)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2024: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2023: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2022: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Keywords | fluid inclusions / opaque minerals / geochemistry / oxygen isotopes / overprinting / mineral chemistry / enargite / quartz / high-sulfidation / gold deposits / porphyry Cu |
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| Outline of Research at the Start |
This project will determine the metal concentration of hydrothermal fluids as it passed through rocks that have been affected by older mineralization events. To achieve this, I will analyze the chemical and isotopic composition of fluids that were trapped inside the minerals during their formation.
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| Outline of Annual Research Achievements |
Fieldworks were carried out to observe different styles of mineralization. The samples used in this study shows overprinting, where epithermal (shallow and low temperature) and porphyry-type (deeper and higher temperature) minerals occur in great proximity to each other. Fluid inclusion analyses were conducted on both transparent and opaque minerals.
The temperature of formation of the minerals were determined and the type of the environment was deduced despite complicated textural relationships. Isotopic ratios of the minerals were measured to determine the contributors to the hydrothermal fluid. Isotopic signatures of crystals formed in epithermal-type and porphyry-type environments are different, reflecting the variable amount of meteoric and magmatic fluid input in each condition.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
Fieldworks were conducted as planned and the samples that were collected are of good quality and suitable for various laboratory analyses. Mineral identification using petrography, electron microscopy and X-ray diffraction methods were carried out. EPMA analyses of gangue and ore minerals were carried out to determine the quantitative composition of each mineral. Fluid inclusion microthermometry was used to estimate the temperature of formation. Isotopes of sulfur, lead, oxygen and hydrogen were measured to estimate the sources and pathways of fluids. We are now correlating these results to determine how the incorporation of trace elements depend on temperature and other factors in overprinted hydrothermal systems.
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| Strategy for Future Research Activity |
Further radiometric and stable isotopic analyses are planned to further constrain the fluid pathways. Laser ablation analyses of minerals and fluid inclusions will be conducted that will give us a direct measurement of the chemistry of the fluids. The results of the geochemistry of the fluids will be compared to the geochemistry of the minerals and bulk rock data to further understand how these data correlate with each other, and how could it be applied for exploration targeting of mineral resources.
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