利用汞同位素示踪华南低温成矿域金和汞矿床成矿物质来源和成矿过程

The South China low-temperature metallogenic domain (SCLTMD), which is located in the southwestern Yangtze platform, composes three mercury and gold metallogenic belts which are the Xiang-Qian mercury belt, Youjiang carlin-type deposit belt and Xiangzhong Sb-Au deposit belt. The three metallogenic belts show significant paragensis and separation of gold and mercury. Understanding the sources geochemical processes of ore-forming materials in these metallogenic belts is crucial to explain the paragensis and separation of gold and mercury. Using the isotopes of ore-forming elements is a popular approach to reveal ore-forming sources and their evolution in hydrothermal deposits, because traditional isotopes (e.g., C, H, O, S) behave different from ore-forming elements and often results in multi-interpretations. Mercury isotopes are new tracers to trace the ore-forming sources and mineralization processes of hydrothermal deposits. In the proposed project, we plan to carry out a systematic investigation on the isotopic variations of mercury in representive deposits from the Xiang-Qian mercury belt, Youjiang carlin-type deposit belt, Xiangzhong Sb-Au deposit belt. Mercury isotopic variations of ore-forming materials and potential source rocks in different deposits in SCLTMD will be investigated to understand the sources of ore-forming materials, mineralization processes, and the mechanisms of the paragensis and separation of gold and mercury in SCLTMD. The results from this proposed study are of importance in deepening our knowledge on metallogenic theory for SCLTMD.

华南低温成矿域位于扬子地台西南缘，存在三条显著的金汞矿化带，包括湘黔汞矿带、右江盆地卡林型金汞矿带和湘中盆地锑金矿带，其中成矿元素金和汞存在密切的共生分异现象。研究三个矿带的成矿来源和成矿过程，对理解矿床分带和共生分异机制具有重要启示意义。利用成矿元素本身的同位素来示踪成矿物质的来源和演化是目前国际流行的趋势，它可以避免传统同位素(如C、H、O、S)由于与主成矿元素的不一致性而导致的多解性。汞同位素地球化学作为一种全新的地球化学手段，对示踪热液矿床成矿物质来源和成矿过程等具有重要意义。本项目拟选择湘黔汞矿带、右江盆地卡林型金矿带和湘中盆地锑金矿带的代表性矿床，系统开展汞同位素研究。通过测定不同类型矿床矿石、围岩及地层样品的汞同位素组成变化，研究不同矿床的物质来源和成矿过程，探讨不同成矿带元素共生分异的机制。本项目的研究成果对深化华南低温成矿域成矿理论具有重要意义。

华南低温成矿域位于扬子地台西南缘，存在三条显著的金汞矿化带(包括湘黔汞矿带、右 江盆地卡林型金汞矿带和湘中盆地锑金矿带)，其中成矿元素金和汞存在密切的共生分异现象。 研究三个矿带的成矿来源和成矿过程，对理解矿床分带和共生分异机制具有重要启示意义。汞同位素地球化学作 为一种全新的地球化学手段，对示踪热液矿床成矿物质来源和成矿过程等具有重要意义。本项目针对湘黔汞矿带、右江盆地卡林型金矿带和湘中盆地锑金矿带的代表性矿床，系统开展了汞同位素研究。通过测定不同类型矿床矿石、围岩及地层样品的汞同位素组成变化，研究不同矿床的物质来源和成矿过程，探讨不同成矿带元素共生分异的机制。本项目的研究成果对深化华南低温成矿域成矿理论具有重要意义。