Onboard experiment investigating metal leaching of fresh hydrothermal sulfide cores into seawater

Shigeshi Fuchida, Jun ichiro Ishibashi, Kazuhiko Shimada, Tatsuo Nozaki, Hidenori Kumagai, Masanobu Kawachi, Yoshitaka Matsushita, Hiroshi Koshikawa

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We observed the initial release rate of metals from four fresh (i.e., without long time exposure to the atmosphere) hydrothermal sulfide cores into artificial seawater. The sulfide samples were collected by seafloor drilling from the Okinawa Trough by D/V Chikyu, powdered under inert gas, and immediately subjected to onboard metal-leaching experiments at different temperatures (5°C and 20°C), and under different redox conditions (oxic and anoxic), for 1-30h. Zinc and Pb were preferentially released from sulfide samples containing various metals (i.e., Mn, Fe, Cu, Zn, Cd, and Pb) into seawater. Under oxic experimental conditions, Zn and Pb dissolution rates from two sulfide samples composed mainly of iron disulfide minerals (pyrite and marcasite) were higher than those from two other sulfide samples with abundant sphalerite, galena, and/or silicate minerals. Scanning electron microscopy confirmed that the high metal-releasing sample contained several galvanic couples of iron disulfide with other sulfide minerals, whereas the low metal-releasing sample contained fewer galvanic couples or were coated by a silicate mineral. The experiments overall confirmed that the galvanic effects with iron disulfide minerals greatly induce the initial release of Zn and Pb from hydrothermal sulfides into seawater, especially under warm oxic conditions.

元の言語英語
記事番号15
ジャーナルGeochemical Transactions
19
発行部数1
DOI
出版物ステータス出版済み - 12 6 2018

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology

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    Fuchida, S., Ishibashi, J. I., Shimada, K., Nozaki, T., Kumagai, H., Kawachi, M., Matsushita, Y., & Koshikawa, H. (2018). Onboard experiment investigating metal leaching of fresh hydrothermal sulfide cores into seawater. Geochemical Transactions, 19(1), [15]. https://doi.org/10.1186/s12932-018-0060-9