Geochemical Indicators in the Hydrothermal Fluids for Exploration of Overprinting Orebodies
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 |
Review Section |
Basic Section 31020:Earth resource engineering, Energy sciences-related
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Research Institution | Akita University |
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 2022)
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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 / mineral chemistry / enargite / quartz / overprinting / high-sulfidation / gold deposits / porphyry Cu |
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 |
Fieldwork has been carried out in the Philippines to collect samples of porphyry and epithermal orebodies. Thin and thick sections of rock samples have been prepared for petrographic, fluid inclusions studies and electron probe microanalysis. A new optical microscope has been procured using this project and was used for petrographic observations. Mineral chemistry of enargite, the main ore mineral in the epithermal orebody, has been determined using the electron probe microanalyzer (EPMA). Bulk chemical composition of fluid inclusions in quartz and enargite has also been analyzed with the contribution of the collaborators. The internal structure of enargite have been successfully observed using an infrared camera. Phase transitions of fluid inclusions under infrared light observation have also been successfully documented, although a few data on the homogenization temperature and salinity of enargite-hosted fluid inclusions have been gathered. Observations on the relationships between the mineral chemistry of enargite, the chemistry of fluid inclusions and temperatures of formation are currently being summarized. Abstracts for conference presentations have been submitted and a manuscript about an orebody is currently being prepared.
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Current Status of Research Progress |
Current Status of Research Progress
3: Progress in research has been slightly delayed.
Reason
Due to the delay in the procurement of gases necessary to operate the laser ablation machine, the LA-ICPMS analysis has not yet been carried out. Some commercial laboratories have changed operation conditions due to the pandemic, so some laboratory analyses are delayed.
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Strategy for Future Research Activity |
Laboratory analysis including fluid inclusion and mineral chemistry analysis will be continued to get significant amount of data. Petrography and XRD analyses of rock samples on overprinting epithermal high-sulfidation and porphyry-type systems would be carried out this year. Samples for isotopic analyses will be sent to Canada and New Zealand to determine the source of ore-forming fluids.
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Report
(1 results)
Research Products
(2 results)
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[Presentation] Ore mineral chemistry and fluid composition of the Florence Orebody, Lepanto Mine, Mankayan District, Northern Luzon, Philippines2023
Author(s)
Ryota Mine, Pearlyn Manalo, Ryohei Takahashi, Nigel Blamey, Andrea Agangi, Hinako Sato, Akira Imai, Leo Subang, Mervin de los Santos, Rhyza Ruth Parcon-Calamohoy, Glenn Alburo
Organizer
Japan Geoscience Union Meeting 2023
Related Report
Int'l Joint Research
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[Presentation] Characteristics of two different high-sulfidation veins in the Florence orebody, Lepanto Mine, Mankayan District, Philippines2022
Author(s)
Ryota Mine, Pearlyn Manalo, Ryohei Takahashi, Andrea Agangi, Hinako Sato, Akira Imai, Rhyza Ruth Parcon-Calamohoy, Glenn Alburo, Leo Subang, Mervin de los Santos
Organizer
GEOCON 2022: Disruptions, Transformations - Geosciences at the Forefront
Related Report