[M-IS16] 地球掘削科学

[MIS16-03] 沖縄トラフ熱水活動域における科学掘削：CK16-01掘削同時検層速報

*斎藤 実篤¹、濱田 洋平¹、辻 健²、白石 和也¹、Hsiung Kan-Hsi¹、Eng Chandoeun²、吉本 佳太³、木戸 ゆかり¹、真田 佳典¹、熊谷 英憲¹、野崎 達生¹、石橋 純一郎²、前田 玲奈¹、CK16-01 乗船者一同 (1.国立研究開発法人海洋研究開発機構、2.九州大学、3.山口大学)

キーワード：沖縄トラフ、戦略的イノベーション 創造プログラム(SIP)、掘削同時検層、海底熱水鉱床、伊平屋北海丘、伊平屋小海嶺

A scientific drilling cruise CK16-01 was conducted by D/V Chikyu at the active hydrothermal fields on Iheya-North Knoll and Iheya Minor Ridge in the Okinawa Trough in February-March of 2016, as a part of the Cross-ministerial Strategic Innovation Promotion Program (SIP). During the former half of the cruise logging while drilling (LWD) was deployed to investigate subseafloor stratigraphy and hydrogeology. The long-term monitoring apparatus, "Kuroko-ore cultivation apparatus", was also installed, that is equipped with sensors to monitor the secular variation of pressure, temperature, flow rate, and precipitation weight within the apparatus on artificial hydrothermal vents. In succession to the operations, coring were conducted in the later half of the cruise.
The LWD tools acquire natural gamma ray, resistivity, borehole images, and annular pressure and temperature data. Based on the results from the CK14-04 cruise in 2014 at the Iheya-North Knoll, LWD was useful to identify and characterize the submarine hydrothermal deposits and the LWD survey enhanced the successful recovery of sulfide samples. In this presentation, we report the preliminary results of LWD deployed during the CK16-01 Cruise.