卡林型金矿汞同位素地球化学研究

Carlin-type gold deposit is a very important type of gold deposit which has an good future for the ore geochemical exploration in China, especially in SW Guizhou Province. However, many puzzles (e.g. Sources of ore-forming materials and the ore-forming processes) still remains in the understanding of ore formation of Carlin-type gold deposits in this region.In the nature, the minerlization of gold has a very close relation with that of mercury (Hg). Hence the anomlies of mercury in the earth system can potentially guide gold deposit exploration, especially for Carlin-type deposits. As the development of analytical techniques, exploring the isotope dimention of Hg is becoming an useful approach in tracing the sources and geochemical processes of ore-forming materials in the the carlin-type deposits. In the proposed project, we plan to carry out a investigation on mercury and mercury isotope varations in a typical Carlin-type gold deposit, which is named Shuiyingdong gold deposit (Located in SW Guizhou Province). According to this project, we will investigate the Hg isotope and Hg content in different locations of the whole hydrothemal system, such as rocks, minerals etc. Meanwhile, the mineralogy, petrology, as well as elemental geochemistry in the Shuiyingdong gold deposit will also be investigated to better understand the metallogenic mechanism of Carlin-type gold deposits in SW Guizhou. Our study has very good implications in the research field of Hg isotope geochemistry and geochemical perspecting of Carlin-type gold deposits.

卡林型金矿是我国重要的和极具勘探远景的金矿类型之一。黔西南地区是我国卡林型金矿分布的重要地区,然而该区卡林型金矿的成矿物质来源、成矿机制等问题仍存在争议。自然界金和汞存在密切的地球化学关系，汞矿化或汞异常对卡林型金矿研究有重要的指示意义。汞同位素地球化学是当前国际地球科学的前沿领域，对示踪矿床成矿物质来源、成矿过程等具有特殊意义。汞同位素在矿床学中的研究是汞同位素地球化学研究的一个相对薄弱的环节。因此，本项目选择黔西南具有代表性的水银洞卡林型金矿作为切入点，从汞及汞同位素的角度入手，并结合地质、岩矿、元素地球化学等常规手段的综合研究，旨在解决"利用汞及汞同位素示踪卡林型金矿成矿物质来源、成矿过程"这一重要科学问题，发掘卡林型金矿的成矿过程、成矿模式和成矿规律的重要信息。本研究对卡林型金矿的找矿勘探和汞同位素体系的完善具有双重意义。

卡林型金矿是我国非常重要的和极具勘探远景的金矿类型之一。自然界金矿化和汞矿化往往在空间上存在共生关系，汞矿化或汞异常对金矿的勘查有着重要的指示意义。汞同位素地球化学是示踪环境中汞来源和地球化学行为的最新手段。本项目自2014年以来，围绕我国典型卡林型金矿中汞的同位素地球化学开展了细致的研究工作。本项目选取我国黔西南具有代表性的卡林型金矿—水银洞金矿，从汞及汞同位素的角度入手，通过系统采集该金矿的岩石、矿石样品；分析其汞含量及汞同位素组成；探讨金与汞在成矿过程中的地球化学关系；发掘该类型金矿的成矿特征和成矿规律；本研究表明，汞同位素可有效的示踪水银洞金矿汞的来源，并能指示该金矿若干重要成矿作用（如淋滤作用、挥发作用等）的重要信息。本项目的研究成果，无疑将丰富和完善卡林型金矿成矿理论，拓宽找矿思路，并最终为卡林型金矿成矿预测和地球化学勘查提供科学和技术支撑。