| CHEN Jie,TAO Chunhui,LIANG Jin,LIAO Shili,DONG Chuanwan,LI Huaiming,LI Wei,WANG Yuan,YUE Xihe,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 |
| 新发现的超慢速扩张西南印度洋脊63°E热液活动 |
| Newly discovered hydrothermal fields along the ultraslow-spreading Southwest Indian Ridge around 63°E |
| 投稿时间:2018-05-05 |
| DOI:10.1007/s13131-018-1333-y |
| 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 |
| 英文关键词:Southwest Indian Ridge ultraslow-spreading hydrothermal field local enhanced magmatism heat source |
| 基金项目: |
| 作者 | 单位 | E-mail | | 陈杰 | 国家海洋局第二海洋研究所 海底科学重点实验室, 杭州, 310012 | | | 陶春辉 | 国家海洋局第二海洋研究所 海底科学重点实验室, 杭州, 310012 | taochunhuimail@163.com | | 梁锦 | 国家海洋局第二海洋研究所 海底科学重点实验室, 杭州, 310012 | | | 廖时理 | 国家海洋局第二海洋研究所 海底科学重点实验室, 杭州, 310012 | | | 董传万 | 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 | | | 李怀明 | 国家海洋局第二海洋研究所 海底科学重点实验室, 杭州, 310012 | | | 李伟 | 国家海洋局第二海洋研究所 海底科学重点实验室, 杭州, 310012 | | | 王媛 | 国家海洋局第二海洋研究所 海底科学重点实验室, 杭州, 310012 | | | 岳羲和 | 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 | | | 何拥华 | 国家海洋局第二海洋研究所 海底科学重点实验室, 杭州, 310012 | |
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| 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。 |
| 英文摘要: |
| 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 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. |
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