关于深化钦杭成矿带古海洋喷流热水沉积及其成矿作用研究的思考  

Considerations on Study of Paleo-oceanic Seafloor Exhalative Hydrothermal Sedimentation and Related Mineral Deposits of the Qinzhou-Hangzhou Metallogenic Belt,South China

作　　者：周永章[1,2,3] 杨威 虞鹏鹏 郑义[1,2,3] 沈文杰 张前龙[1,2,3] ZHOU Yong-Zhang;YANG Wei;YU Peng-Peng;ZHENG Yi;SHEN Wen-Jie;ZHANG Qian-Long(Center for Earth Environment&Resources,Sun Yat-sen University,Guangzhou 510275,Guangdong,China;Guangdong Provinical Key Laboratory of Mineral Resources and Geological Processes,Guangzhou 510275,Guangdong,China;Department of Earth Sciences,Sun Yat-sen University,Guangzhou 510275,Guangdong,China;Guangdong Institute of Quanlity Resource&Environment,Guangzhou 510000,Guangdong,China)

机构地区：[1]中山大学地球环境与地球资源研究中心,广东广州510275 [2]广东省地质过程与矿产资源探查重点实验室,广东广州510275 [3]中山大学地球科学与工程学院,广东广州510275 [4]广东高质资源环境研究院,广东广州510000

出　　处：《华南地质》2022年第3期382-393,共12页South China Geology

基　　金：国家重点研发计划重点专项(2016YFC0600506);国家自然科学基金(41273040);中国地质调查局项目(12120113067600)。

摘　　要：钦杭成矿带是扬子和华夏两个古陆间的巨型构造结合带,古海洋海底喷流热水沉积多层位多类型分布,是研究喷流热水沉积体系的精细时空结构与古陆间构造结合带演化耦合机制的理想场所。本文在评述已有研究基础上,提出了深化钦杭成矿带古海洋喷流热水沉积及其成矿作用研究的建议。从钦杭成矿带同时也是两个古陆结合带的整体视角,分析喷流热水沉积的时空分布特征和发育背景,区分不同沉积建造类型,剖析喷流热水沉积体系的地球化学三维空间结构,揭示喷流热水沉积体系时空结构与古陆间构造结合带演化的耦合机制。通过新设备、新手段和新思路,厘定不同层位和类型喷流热水沉积在矿物学、岩石学、地球化学方面表现出的同一性和多样性,剖析不同喷流热水沉积矿物微组构、微成分,以及B、S、Fe、Cu、Zn同位素信息的精细差异,揭示这些同一性、多样性和信息精细差异对古陆间构造体系及喷流热水沉积体系演化的响应,可望引发喷流热水沉积成矿作用研究的突破,研究结果将深化对喷流热水沉积成矿作用的认识,为海底喷流热水沉积矿床勘查提供指导,提升钦杭带成矿理论研究水平。The Qinzhou-Hangzhou Metallogenic Belt(QHMB) is a giant tectonic junction zone between the Yangtze and Cathaysia palaeo-continents.The multi-layered distribution of ancient marine submarine sedimentary exhalative(Sedex) makes it an ideal place to study the precise spatial and temporal structure of the Sedex system and the coupling mechanism of the evolution of the palaeo-continental tectonic junction belt.Based on the review of existing studies,this paper proposes more intensive research on the palaeo-oceanic Sedex and its mineralisation in the QHMB.From the perspective that the QHMB is also the junction belt of two palaeo-terrestrial zones,we analyse the spatial and temporal distribution characteristics and development setting of the Sedex deposits,so to distinguish different types of sedimentary construction,dissect the geochemical three-dimensional spatial structure of the Sedex system,and reveal the coupling mechanism between the spatial and temporal structure of the Sedex system and the evolution of the palaeo-terrestrial tectonic junction zone.With new equipment,new tools and new ideas,the homogeneity and diversity of mineralogy,petrology and geochemistry of different layers and types of the Sedex ore deposits could be identified,and the precise differences in the microstructure and micro-composition of different Sedex ore minerals and the isotopic information of B,S,Fe,Cu and Zn have been analysed to reveal these homogeneity,diversity and precise differences in correspondence with the inter-continent tectonic system and the evolution of the Sedex system.The results would deepen the understanding of the mineralisation of the Sedex system,provide guidance for the exploration of submarine Sedex deposits and improve the mineralisation theory research of the QHMB.

关 键 词：热水沉积 SEDEX型矿床 沉积地球化学 钦杭成矿带 

分 类 号：P617[天文地球—矿床学] P611[天文地球—地质学]