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Newly discovered hydrothermal fields along the ultraslow-spreading Southwest Indian Ridge around 63°E
引用本文:陈杰,陶春辉,梁锦,廖时理,董传万,李怀明,李伟,王媛,岳羲和,何拥华.Newly discovered hydrothermal fields along the ultraslow-spreading Southwest Indian Ridge around 63°E[J].海洋学报(英文版),2018,37(11):61-67.
作者姓名:陈杰  陶春辉  梁锦  廖时理  董传万  李怀明  李伟  王媛  岳羲和  何拥华
作者单位:国家海洋局第二海洋研究所 海底科学重点实验室, 杭州, 310012,国家海洋局第二海洋研究所 海底科学重点实验室, 杭州, 310012,国家海洋局第二海洋研究所 海底科学重点实验室, 杭州, 310012,国家海洋局第二海洋研究所 海底科学重点实验室, 杭州, 310012,国家海洋局第二海洋研究所 海底科学重点实验室, 杭州, 310012;浙江大学 地球科学学院, 杭州, 310010,国家海洋局第二海洋研究所 海底科学重点实验室, 杭州, 310012,国家海洋局第二海洋研究所 海底科学重点实验室, 杭州, 310012,国家海洋局第二海洋研究所 海底科学重点实验室, 杭州, 310012,国家海洋局第二海洋研究所 海底科学重点实验室, 杭州, 310012;中国地质大学(武汉)海洋学院, 武汉, 430074,国家海洋局第二海洋研究所 海底科学重点实验室, 杭州, 310012
摘    要:The ultraslow-spreading Southwest Indian Ridge(SWIR) to the east of the Melville fracture zone is characterized by very low melt supply and intensive tectonic activity. Due to its weak thermal budget and extremely slow spreading rate, the easternmost SWIR was considered to be devoid of hydrothermal activity until the discovery of the inactive Mt. Jourdanne hydrothermal field(27°51′S, 63°56′E) in 1998. During the COMRA DY115-20 cruise in2009, two additional hydrothermal fields(i.e., the Tiancheng(27°51′S, 63°55′E) and Tianzuo(27°57′S, 63°32′E)fields) were discovered. Further detailed investigations of these two hydrothermal sites were conducted by Chinese manned submersible Jiaolong in 2014–2015. The Tiancheng filed can be characterized as a lowtemperature(up to 13.2°C) diffuse flow hydrothermal field, and is hosted by fractured basalts with hydrothermal fauna widespread on the seafloor. The Tianzuo hydrothermal field is an inactive sulfide field, which is hosted by ultramafic rocks and controlled by detachment fault. The discovery of the three hydrothermal fields around Segment #11 which receives more melt than the regional average, provided evidence for local enhanced magmatism providing heat source to drive hydrothermal circulation. We further imply that hydrothermal activity and sulfide deposits may be rather promising along the easternmost SWIR.

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收稿时间:2018/5/5 0:00:00

Newly discovered hydrothermal fields along the ultraslow-spreading Southwest Indian Ridge around 63°E
CHEN Jie,TAO Chunhui,LIANG Jin,LIAO Shili,DONG Chuanwan,LI Huaiming,LI Wei,WANG Yuan,YUE Xihe and HE Yonghua.Newly discovered hydrothermal fields along the ultraslow-spreading Southwest Indian Ridge around 63°E[J].Acta Oceanologica Sinica,2018,37(11):61-67.
Authors:CHEN Jie  TAO Chunhui  LIANG Jin  LIAO Shili  DONG Chuanwan  LI Huaiming  LI Wei  WANG Yuan  YUE Xihe and HE Yonghua
Affiliation:1.Key Laboratory of Submarine Geosciences, Second Institute of Oceanography,State Oceanic Administration,Hangzhou,China;2.School of Earth Sciences,Zhejiang University,Hangzhou,China;3.College of Marine Science and Technology,China University of Geoscience,Wuhan,China
Abstract:The ultraslow-spreading Southwest Indian Ridge (SWIR) to the east of the Melville fracture zone is characterized by very low melt supply and intensive tectonic activity. Due to its weak thermal budget and extremely slow spreading rate, the easternmost SWIR was considered to be devoid of hydrothermal activity until the discovery of the inactive Mt. Jourdanne hydrothermal field (27°51′S, 63°56′E) in 1998. During the COMRA DY115-20 cruise in 2009, two additional hydrothermal fields (i.e., the Tiancheng (27°51′S, 63°55′E) and Tianzuo (27°57′S, 63°32′E) fields) were discovered. Further detailed investigations of these two hydrothermal sites were conducted by Chinese manned submersible Jiaolong in 2014–2015. The Tiancheng filed can be characterized as a lowtemperature (up to 13.2°C) diffuse flow hydrothermal field, and is hosted by fractured basalts with hydrothermal fauna widespread on the seafloor. The Tianzuo hydrothermal field is an inactive sulfide field, which is hosted by ultramafic rocks and controlled by detachment fault. The discovery of the three hydrothermal fields around Segment #11 which receives more melt than the regional average, provided evidence for local enhanced magmatism providing heat source to drive hydrothermal circulation. We further imply that hydrothermal activity and sulfide deposits may be rather promising along the easternmost SWIR.
Keywords:Southwest Indian Ridge  ultraslow-spreading  hydrothermal field  local enhanced magmatism  heat source
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