| 研究課題/領域番号 |
22K14633
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| 研究機関 | 秋田大学 |
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研究代表者 |
Manalo Pearlyn 秋田大学, 国際資源学研究科, 助教 (50895480)
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| 研究期間 (年度) |
2022-04-01 – 2025-03-31
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| キーワード | fluid inclusions / opaque minerals / geochemistry / oxygen isotopes / overprinting |
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| 研究実績の概要 |
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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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
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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| 今後の研究の推進方策 |
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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| 次年度使用額が生じた理由 |
The remaining amount will be used for consummables that are necessary for research activities, such as for making thin sections, electron probe microanalysis and laser ablation ICP-MS. It will also be used for analysis that will be outsourced, such as the oxygen and isotopic analyses. Remaining funds will also be used for expenses related to presentation in international and domestic conferences and publication of research results.
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