| 研究課題/領域番号 |
22KK0246
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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) |
2023 – 2025
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| キーワード | fluid inclusions / opaque minerals / infrared microscopy / enargite |
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| 研究実績の概要 |
We conducted fieldworks to collect enargite samples from the Philippines. We have prepared specimens for petrography, mineral chemistry and fluid inclusion analysis. We observed the different textures of enargite crystals and their associated minerals. We measured the composition of enargite using electron probe microanalyzer and found how tellurium and antimony are distributed within this ore mineral. We conducted infrared fluid inclusion microthermometry under infrared light to measure the homogenization temperature and salinities of the fluids. We also observed how the iron content of enargite affects its transparency in infrared light. Within a sample, enargite shows variations in crystal sizes and morphology. Primary fluid inclusions show a negative-crystal shape and consists of liquid and vapor phases. Gas-rich fluid inclusions also occur. We also measured the volatile contents of the fluid inclusions, where we found that enargite contains elevated CO2 and H2S.
We also measured sulfur and lead isotopic ratios that could potentially give clues on the source of metals and hydrothermal fluid evolution. The recent results have been presented in domestic and international conferences.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
1: 当初の計画以上に進展している
理由
We have collected samples that we planned to collect. Furthermore, some samples that were taken from areas that are currently no longer accessible have been donated by collaborators. This would allow more detailed and systematic spatial constraints on our analyses. We have progressed in understanding the new equipment and we have been developing appropriate methodology in analyzing the samples. We added analyses of lead isotopes of enargite that could give us clues on the metal sources.
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| 今後の研究の推進方策 |
We will continue analysis using the electron microprobe, laser ablation ICPMS and infrared fluid inclusion microthermometry to gather more reliable data and test the reproducibility of the results. We will continue to improve the methodology and report the results in international journals. Sulfur isotopes and lead isotopes of more samples will be added.
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