沿岸環境

[II-197] Numerical simulation of submarine hydrothermal ore-deposits due to a coupled process of fluid migration and reactive geochemical transport

*藤田 クラウディア¹、山本 肇¹、石橋 純一郎²、辻 健³ (1. 大成建設株式会社技術センター社会基盤技術研究部、2. 九州大学大学院理学研究院、3. 九州大学大学院工学研究院)

Keywords:submarine hydrothermal ore deposit, hydrothermal convection, TOUGHREACT, coupled hydrothermal fluid flow with reactive geochemical transport

Submarine hydrothermal ore-deposits are known to be rich in metal resources and are to be found abundant around the Japanese islands. In recent years, several studies had been carried out and a lot of data on chemical, physical and biological properties of compounds have been gathered especially for hydrothermal fields in the Okinawa Trough. However, the mechanism of formation of these deposits is not yet clearly understood. The following features were clarified. Among the alternating layer structure, preferential horizontal flow is obvious for layers with high permeability, which resulted in primary sulfide precipitation with a lateral extend.