Geological context and vents morphology in the ultramafic-hosted Tianxiu field, Carlsberg Ridge  

作　　者：Jin Liang Chunhui Tao Xiangxin Wang Cheng Su Wei Gao Yadong Zhou Weikun Xu Xiaohe Liu Zhongjun Ding 

机构地区：[1]Key Laboratory of Submarine Geosciences,Ministry of Natural Resources,Hangzhou 310012,China [2]Second Institute of Oceanography,Ministry of Natural Resources,Hangzhou 310012,China [3]School of Oceanography,Shanghai Jiao Tong University,Shanghai 200030,China [4]National Deep Sea Center,Qingdao 266237,China [5]School of Earth Sciences,Zhejiang University,Hangzhou 310027,China [6]Ocean College,Zhejiang University,Zhoushan 316021,China

出　　处：《Acta Oceanologica Sinica》2023年第9期62-70,共9页海洋学报（英文版）

基　　金：The National Key Research and Development Program of China under contract No. 2017YFC0306603;the National Key Research and Development Program of China under contract No. 2021YFC2801705;the Scientific Research Fund of the Second Institute of Oceanography;Ministry of Natural Resources under contract Nos JG1905 and SZ2201;the National Natural Science Foundation of China under contract No. 41806076。

摘　　要：The Tianxiu hydrothermal field(TXHF) located on Carlsberg Ridge is one of the few active ultramafic-hosted venting systems known in the Indian Ocean. Despite numerous investigations, there is limited understanding of its sulfide structure morphology, and the factors controlling the formation of TXHF are poorly understood. In this study, we conducted detailed seafloor mapping using visual data obtained by dives using the human-occupied vehicle(HOV) Jiaolong. The TXHF is found to be an active, off-axis, ultramafic-hosted, high-temperature hydrothermal area in which serpentine peridotite is exposed. Two main hydrothermal sites were identified, i.e., P and Y, both of which feature a complex of chimneys and beehive diffusers constituting a “chimney jungle” and isolated large steep-sided structures developed on flat-lying sulfide mounds. In addition, some sporadic inactive chimneys and outcrops of hydrothermal deposits were noted. The chimneys are rich in Fe and Zn sulfide, and lack the central fluid channel formed by focused high-temperature fluid flow. Hydrothermal venting at TXHF is likely related to low-angle detachment faults that focus and transport hydrothermal fluids away from a heat source along the valley wall. Our results complement and expand upon previous works concerning sulfide chimney morphology and their corresponding mineral paragenesis in ultramafic-hosted hydrothermal systems in the Indian Ocean and further our understanding of modern seafloor hydrothermal systems.

关 键 词：hydrothermal activity sulfide accumulation MORPHOLOGY ultramafic-hosted Carlsberg Ridge 

分 类 号：O61[理学—无机化学]