| CHEN Jie,TAO Chunhui,LIANG Jin,LIAO Shili,DONG Chuanwan,LI Huaiming,LI Wei,WANG Yuan,YUE Xihe,HE Yonghua. 2018. Newly discovered hydrothermal fields along the ultraslow-spreading Southwest Indian Ridge around 63°E. Acta Oceanologica Sinica, 37(11):61－67 |
| Newly discovered hydrothermal fields along the ultraslow-spreading Southwest Indian Ridge around 63°E |
| 新发现的超慢速扩张西南印度洋脊63°E热液活动 |
| Received:May 05, 2018 |
| DOI：10.1007/s13131-018-1333-y |
| Key words:Southwest Indian Ridge ultraslow-spreading hydrothermal field local enhanced magmatism heat source |
| 中文关键词: 西南印度洋中脊 超慢速扩张 热液区 局部强岩浆供给 热源 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | CHEN Jie | Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | | | TAO Chunhui | Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | taochunhuimail@163.com | | LIANG Jin | Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | | | LIAO Shili | Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | | | DONG Chuanwan | Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
School of Earth Sciences, Zhejiang University, Hangzhou 310010, China | | | LI Huaiming | Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | | | LI Wei | Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | | | WANG Yuan | Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | | | YUE Xihe | Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
College of Marine Science and Technology, China University of Geoscience, Wuhan 430074, China | | | HE Yonghua | Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | |
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| 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 low-temperature (up to 13.2℃) 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. |
| 中文摘要: |
| 在西南印度洋超慢速扩张脊（SWIR）最东段，Melville转换断层以东区域，岩浆供给整体极为贫瘠并具有较强的构造活动。由于热平衡较低并且扩张极为缓慢，SWIR最东段一直被认为缺失海底热液活动，直至1998年Mt.Jourdanne热液区（63°56'E/27°51'S）被发现。2009年，中国大洋20航次在这段洋中脊上发现了两个新的热液区，即天成热液区（63°55'E/27°51'S）和天作热液区（63°32'E/27°57'S）。2014-2015年，中国蛟龙号载人深潜器对这两个热液区开展了进一步的详细调查。其中，天成热液区以玄武岩为基岩，海底存在低温的弥散流（最高温度仅为13.2℃），热液区遍布热液生物；天作热液区是以超基性岩为基岩受拆离断层控制的非活动的硫化物区。这三个热液区位于岩浆供给相对区域平均水平较多的#11洋脊段附近，这为超慢速扩张洋脊局部强岩浆供给为驱动热液循环提供热源的机制提供了证据。本文进一步可推测，热液活动以及硫化物矿床在SWIR最东段具有较大的勘探前景。 |
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