Geochemical Indicators in the Hydrothermal Fluids for Exploration of Overprinting Orebodies

2023 Fiscal Year Research-status Report

• Project/Area Number: 22K14633
• Research Institution: Akita University
• Principal Investigator: Manalo Pearlyn 秋田大学, 国際資源学研究科, 助教 (50895480)
• Project Period (FY): 2022-04-01 – 2025-03-31
• Keywords: fluid inclusions / opaque minerals / geochemistry / oxygen isotopes / overprinting

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.

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.

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.

Causes of Carryover

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.

Research Products

• [Int'l Joint Research] University of the Philippines Diliman/Philippine Nuclear Research Institute(フィリピン)
  • Country Name: PHILIPPINES
  • Counterpart Institution: University of the Philippines Diliman/Philippine Nuclear Research Institute
• [Int'l Joint Research] Western University(カナダ)
  • Country Name: CANADA
  • Counterpart Institution: Western University
• [Int'l Joint Research] University of Geneva(スイス)
  • Country Name: SWITZERLAND
  • Counterpart Institution: University of Geneva
• [Int'l Joint Research] University of the Witwatersrand/University of Johannesburg(南アフリカ)
  • Country Name: SOUTH AFRICA
  • Counterpart Institution: University of the Witwatersrand/University of Johannesburg
• [Journal Article] Trace element variations and sulphur isotopic ratios of enargite and alunite from the quartz-pyrite-gold orebodies, Mankayan District, Philippines (2023)
  • Author(s): Manalo P., Mine R., Takahashi R., Imai A., Agangi A., Alburo G., Subang L., Parcon-Calamohoy R.R., de los Santos M.,
  • Journal Title: Mineral Deposits in a Changing World, 17th Biennial SGA Meeting Proceedings Vol 1 Volume: 1 Pages: 159-162
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] Host rock alteration and ore-forming conditions of the Barlo volcanogenic massive sulfide deposit in Pangasinan (2023)
  • Author(s): Manalo P., Gabo-Ratio J.A., Perez, A., Takahashi R., Agangi A., Sato H., Imai A.
  • Organizer: GeoCon 2023: Our Natural Resources: Fueling the Energy Transition Journey
  • Int'l Joint Research
• [Presentation] Epithermal Mineralization Characteristics of Alkaline-Hosted Deposit in San Luis, Cordon, Isabela, Philippines. (2023)
  • Author(s): Tagle, V., Gabo-Ratio, J.A.S., Tizon, A.R., Garcia, M.Y.R., and Manalo, P.C.
  • Organizer: The 14th AUN/SEED-Net Regional Conference on Geological and Geo-resources Engineering (RCGeoE) & The 2nd International Conference on Earth Resources and Geo- Environment Technology 2023 (EraGET2023)
  • Int'l Joint Research
• [Presentation] Mineralization Characteristics and Ore-Forming Conditions of the Adit 9 Area, Marian Gold Deposit, Northern Luzon, Philippines (2023)
  • Author(s): Ramos, R., Gabo-Ratio, J.A.S., Tizon, A.R., Garcia, M.Y.R., and Manalo, P.C.
  • Organizer: The 14th AUN/SEED-Net Regional Conference on Geological and Geo-resources Engineering (RCGeoE) & The 2nd International Conference on Earth Resources and Geo- Environment Technology 2023 (EraGET2023)
  • Int'l Joint Research
• [Presentation] Retrograde overprinting and magmatic fluid origin of the skarn Fe-Cu mineralization in the Masara Gold District (2023)
  • Author(s): Garcia, M.Y.R., Gabo-Ratio, J.A.S., Amoroso, Manalo, P.C. and Takahashi, R
  • Organizer: GeoCon 2023: Our Natural Resources: Fueling the Energy Transition Journey
  • Int'l Joint Research
• [Presentation] Ore-forming Processes of the Skarn Fe-Cu Deposit in the Masara Gold District, Eastern Mindanao, Philippines. (2023)
  • Author(s): Garcia, M.Y.R., Gabo-Ratio, J.A.S., Amoroso, Manalo, P.C. and Takahashi, R.
  • Organizer: 20th Annual Meeting of the Asia Oceania Geosciences Society, Jul 30 - Aug 04, 2023,
  • Int'l Joint Research
• [Presentation] Mineral chemistry and fluid inclusion characteristics of enargite in the Northwest orebody, Lepanto, Mankayan, Philippines (2023)
  • Author(s): Manalo P., Takahashi R., Agangi A., Blamey N., Imai A.
  • Organizer: The 72nd Annual Meeting of the Society of Resource Geology
• [Presentation] Mineralogy and geochemistry of the Barlo volcanogenic massive sulfide deposit, Pangasinan, Philippines (2023)
  • Author(s): Manalo P., Noda, N., Takahashi R., Agangi A., Sato H., Perez A., Gabo-Ratio J.A., Imai A.
  • Organizer: The 72nd Annual Meeting of the Society of Resource Geology
• [Presentation] Nature of alkalic epithermal vein mineralization in Cordon, northern Luzon, Philippines (2023)
  • Author(s): Balmater H., Takahashi R., Sato H., Manalo P., Agangi A., Gabo-Ratio J.A., Yumul G.P.Jr.
  • Organizer: The 72nd Annual Meeting of the Society of Resource Geology
• [Presentation] Ore mineralogy, geochemistry, and fluid inclusion characteristics of two vein types in the Florence orebody, Mankayan District, Philippines (2023)
  • Author(s): Mine R., Manalo P., Takahashi R., Agangi A., Sato H., Imai A., Blamey N., Subang L., de los Santos M., Parcon-Calamohoy, R.R., Alburo G.
  • Organizer: The 72nd Annual Meeting of the Society of Resource Geology
• [Presentation] Characteristics of the Quemaldero porphyry Cu-Au prospect hosted by the Cordon Syenite Complex in Isabela, Luzon, Philippines (2023)
  • Author(s): Yaginuma A., Manalo P., Takahashi R., Agangi A., Sato H., Gabo-Ratio J.A., Yumul G.P.Jr.
  • Organizer: The 72nd Annual Meeting of the Society of Resource Geology