热液白云岩的研究现状及展望  

Hydrothermal Dolomite: A Review and Perspective

作　　者：李群 包志伟[1] LI Qun;BAO Zhiwei(CAS Key Laboratory for Mineralogy and Metallogeny,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,Guangdong,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院广州地球化学研究所,中国科学院矿物学与成矿学重点实验室,广东广州510640 [2]中国科学院大学,北京100049

出　　处：《大地构造与成矿学》2018年第4期699-717,共19页Geotectonica et Metallogenia

基　　金：国家重点基础研究发展计划项目(2014CB440905)资助。

摘　　要：热液白云岩与油气藏及赋存在沉积岩中的铅锌矿床,特别是密西西比河谷型(MVT)铅锌矿床具有密切的空间联系。MVT矿床赋矿地层均存在大范围的白云岩化,地质找矿实践中热液白云岩常作为MVT矿床的重要找矿标志之一,然而热液白云岩与MVT矿床之间的成因联系一直存在争议。本文对热液白云岩的定义、地球化学特征、空间展布规律、成因模式及其与热液矿床和油气储存关系的研究历史及现状进行了系统评述,并结合滇东北地区MVT矿床实例对热液白云岩与硫酸盐热还原过程、硫化物沉淀之间的关系及其找矿地质意义进行了探讨,并对热液白云岩研究存在的问题和研究方向进行了讨论和展望。Hydrothermal dolomite commonly closely associates with oil-gas reservoirs and sediment-hosted Pb-Zn deposits,the Mississippi Valley-type(MVT)Pb-Zn deposits in particular.Host rocks of MVT deposits usually experienced extensive dolomitization,and indeed,hydrothermal dolomite is considered as a useful prospective indicator for MVT mineralization.However,genetic link between the hydrothermal dolomitization and MVT Pb-Zn mineralization is a matter of debate.This paper briefly reviewed the nomenclature and research history of hydrothermal dolomite,introduced the major geological,geochemical characteristics,and distribution of hydrothermal dolomite,spatial and possibly genetic relationship between hdyrothermal dolomite and hdyrothermal ore deposits and oil-gas reservoirs based on case studies including the occurrence of hydrothermal dolomites in MVT deposits in Southwest China.The temporal and genetic relationships between dolomitizaiton and thermal sulfate reduction,sulfide precipitation and thus the location of ore mineralization well worthy more attention,and comprehensive geological and isotope geochemical and state of art in situ techniques will contribute to understanding of the genesis of hydrotherml dolomite and the spatially related ore deposits and oil-gas reservoirs.

关 键 词：热液白云岩 MVT铅锌矿 找矿标志 成因模式 硫酸盐热还原作用 

分 类 号：P595[天文地球—地球化学] P611[天文地球—地质学]