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sulfide metallogenic model for the ultraslow-spreading Southwest Indian Ridge

Science China Earth Sciences 2023年第6期66卷 1212-1230页

作者： Chunhui TAO Zhikui GUO Jin LIANG Teng DING Weifang YANG Shili LIAO Ming CHEN Fei ZHOU Jie CHEN Nannan WANG Xiaohe LIU Jianping ZHOU Key Laboratory of Submarine Geosciences MNRSecond Institute of OceanographyMNRHangzhou 310012China School of Oceanography Shanghai Jiao Tong UniversityShanghai 200030China School of Marine Science and Engineering Nanjing Normal UniversityNanjing 210023China UniversitéParis Cité Institut de physique du globe de ParisParis 75238France Ocean College Zhejiang UniversityZhoushan 316021China

Polymetallic sulfides present in mid-ocean ridges(MORs)have become important strategic resources for humans,and a scientific metallogenic model is necessary for the investigation and exploration of these *** to fast-and slow-spreading MORs,ultraslow-spreading MORs show substantial differences in magma supply,tectonic activity,and oceanic crust ***,information on hydrothermal circulation and a metallogenic model related to sulfides along the ultraslow-spreading ridges is still limited,which hinders further exploration of these *** this study,the distribution of hydrothermal activities,as well as the characteristics of the structures,heat sources,fluid pathways,host rock types,fluid properties,and sulfide assemblages in typical hydrothermal fields along the ultraslow-spreading Southwest Indian Ridge(SWIR),have been *** is concluded that the hydrothermal systems along the SWIR can be categorized into three types,including local enhanced magma-controlled,one-way detachment/high-angle large-offset fault-controlled,and flip-flop detachment-controlled types,which are further categorized into five subtypes based on their distinct geological ***,we present a sulfide metallogenic model called Local Enhanced Heat Supply-Deep Faults(eheat-dfault)for the *** overall spreading rate remains almost constant(14-18 mm/year),while the magma supply is heterogeneous in the segment scale along the *** the past two decades,various hydrothermal systems and sulfide deposits have been identified along the SWIR.A deep magma chamber(4-9 km)is developed in the ridge segment with sufficient magma supply owing to the local enhanced magma supply,while long-lived active deep detachment faults(up to 13 km)with associated metallogenic belts are developed in ridge segments with poor magma ***,the ultraslow-spreading MORs fulfill the necessary conditions of a sustained heat source and stable hydrothermal pathway for the fo

关键词： Southwest Indian Ridge Ultraslow-spreading ridge eheat-dfault sulfide metallogenic model Enhanced heat supply Detachment fault

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