伊是名海穴における海底下鉱体周辺の熱水性成分の分布

土岐 知弘; 大竹 翼; 石橋 純一郎; 松井 洋平; 川口 慎介; 加藤 大和; 淵田 茂司; 宮原 玲奈; 堤 映日; 中村 峻介; 川喜田 竜平; 宇座 大貴; 上原 力; 新城 竜一; 野崎 達生; 熊谷 英憲; 前田 玲奈

doi:10.14862/geochemproc.64.0_147

Abstracts of Annual Meeting of the Geochemical Society of Japan

DOI https://doi.org/10.14862/geochemproc.64.0_147

Conference information

Host: Abstracts of Annual Meeting of the Geochemical Society of Japan

Distribution of hydrothermal-derived chemical components around the ore body in Izena Hole

*Tomohiro Toki, Tsubasa Ohtake, Jun―ichiro Ishibashi, Yohei Matsui, Shinsuke Kawagucci, Yamato Kato, Shigeshi Fuchida, Rena Miyahara, Akihi Tsutsumi, Shunsuke Nakamura, Ryuhei Kawakita, Hirotaka Uza, Riki Uehara, Ryuichi Shinjo, Tatsuo Nozaki, Hidenori Kumagai, Lena Maeda

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Keywords: Okinawa Trough, hydrothermal fluid, Izena Hole, ore body, interstitial water

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Pages 147-

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Abstract

From 16th November to 15th December 2016, hydrothermal field was drilled at Izena Hole in Okinawa Trough using D/V Chikyu. Five sites were drilled along the transect line from the top of the northern mound of the HAKUREI site to the east side, and 1 site about 500 m northwest of the mound as the reference site. From the collected cores, samples for headspace gas measurement and interstitial water extraction were taken on the ship. Regarding the interstitial water extracted from the sample, pH, alkalinity, nutrients and hydrogen sulfide concentration on ship, and main elements concentration and boron isotopic ratio were measured on land. For samples for gas measurement, hydrocarbon and hydrogen concentrations were measured on ship and carbon isotopic ratios of methane on land.

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