Spatial and temporal variation of the formation of hydrothermal metallic deposit system: Insight from redox condition

2020 Fiscal Year Final Research Report

• Project/Area Number: 18H01927
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 31020:Earth resource engineering, Energy sciences-related
• Research Institution: Kyushu University
• Principal Investigator: YONEZU Kotaro 九州大学, 工学研究院, 准教授 (90552208)
• Co-Investigator(Kenkyū-buntansha): TINDELL THOMAS 九州大学, 工学研究院, 学術研究員 (20736053)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Keywords: 熱水性鉱床 / 希土類元素 / 安定同位体 / 年代測定 / 鉱化環境

Outline of Final Research Achievements

In order to give a new geochemical interpretation on the mineralization environments, the samples from the world-widely recognized deposit such as Hishikari mine, Japan and Mawchi Sn-W deposit, Myanmar and Dairi Zn-Pb deposit, Indonesia including epithermal, porphyry, skarn type deposit are used in this study. The employed analytical methods are microscopy, scanning electron microscopy with energy dispersive X-ray, XRD, XRF, ICP-OES and ICP-MS. In addition, LA-ICP-MS for local quantitative analysis, stable isotope (S, O and H) analyses and geochronological analyses (Ar/Ar, U-Pb and Re-Os) are used to comprehensively understand the spatial and temporal relationship of the mineralization.

Free Research Field

地球化学、鉱床学

Academic Significance and Societal Importance of the Research Achievements

本研究の学術的な意義は、多様な熱水性鉱床をバルク分析と局所分析という観点、あるいは微量元素、安定同位体、年代測定という分析ツールで貫いて、系統立てたデータセットを得たところや鉱化環境の移り変わりを時空間的に示した点にある。社会的意義としては、日本をはじめ世界の大規模鉱床にアクセスし、そのデータを得たことで、次の大規模鉱床の探査・発展に資するデータを蓄積できたところにある。