Internal Structure of a Seafloor Massive Sulfide Deposit by Electrical Resistivity Tomography, Okinawa Trough

K. Ishizu, T. Goto, Y. Ohta, T. Kasaya, H. Iwamoto, C. Vachiratienchai, W. Siripunvaraporn, T. Tsuji, H. Kumagai, K. Koike

研究成果: Contribution to journalArticle査読

8 被引用数 (Scopus)

抄録

Although seafloor massive sulfide (SMS) deposits are crucially important metal resources that contain high-grade metals such as copper, lead, and zinc, their internal structures and generation mechanisms remain unclear. This study obtained detailed near-seafloor images of electrical resistivity in a hydrothermal field off Okinawa, southwestern Japan, using deep-towed marine electrical resistivity tomography. The image clarified a semi-layered resistivity structure, interpreted as SMS deposits exposed on the seafloor, and another deep-seated SMS layer at about 40-m depth below the seafloor. The images reinforce our inference of a new mechanism of SMS evolution: Upwelling hydrothermal fluid is trapped under less-permeable cap rock. The deeper embedded SMS accumulates there. Then hydrothermal fluids expelled on the seafloor form exposed SMS deposits.

本文言語英語
ページ(範囲)11025-11034
ページ数10
ジャーナルGeophysical Research Letters
46
20
DOI
出版ステータス出版済み - 10 28 2019

All Science Journal Classification (ASJC) codes

  • 地球物理学
  • 地球惑星科学(全般)

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