变质地体中钨、金成矿关系研究—以湖南杏枫山矿区为例

建立各类矿床组合模型，是矿床学研究的国际前沿。变质地体中的金矿床是全球最重要的金矿类型，其中的很多金矿区或邻区通常分布有与侵入岩有关的脉型或矽卡岩型钨矿床。受传统测试方法等因素限制，这些金矿床与钨矿床是否具有成因联系而属同一成矿系统，悬而未决，制约了钨、金矿床组合模型的建立和相应的找矿勘查。湖南雪峰山变质岩地区的金矿和钨矿广布，具有密切空间关系，并有少量线索显示该区两类矿床可能具有成因联系，是研究钨、金成矿关系的理想地区。本项目拟选择该区脉型金矿和矽卡岩钨矿共存的杏枫山矿区为对象，通过成岩成矿年代学、矿物微区原位元素-同位素地球化学和比较矿床学的深入研究，厘定该区钨、金矿床的成矿时代、成矿流体成因和成矿过程及其异同，确定钨、金成矿可能的成因联系。为揭示变质地体中钨、金成矿关系进而建立钨、金矿可能的矿床组合模型提供典型范例。研究成果对发展钨、金成矿理论和指导找矿勘查具有重要意义。

Establishing the deposit assemblage model, is the international studying frontier in the field of economic geology. Gold deposits hosted metamorphic terranes are the most important type worldwide, and the intrusion-related vein- and/or skarn-type tungsten deposits usually occur in these gold mining districts or in their adjacent area. Due to the restrictions by the traditional analytical methods, it is unclear whether these gold and tungsten deposits formed during the same hydrothermal system and share an inherent genetic association, which seriously hampered the establishment of the deposit assemblage model for gold and tungsten mineralization and affected the corresponding prospecting for the gold and tungsten deposits. .Gold deposits and independent tungsten deposits are widespread in the Xuefengshan metamorphic terrane, both share a spatial association and a possible genetic association, therefore, this metamorphic terrane is an ideal region for studying the relationship between gold and tungsten mineralization. In the Xingfengshan ore district in this metamorphic terrane, the lode gold deposit and the skarn tungsten deposit simultaneously appear but independently exit. Thus, it is an ideal location to study the association between W and Au mineralization. By means of different methods including chronology, in-situ element-isotope geochemistry and comparative economic geology, this project attempts to accurately determine the timing of W and Au mineralization, confirm their origin of the ore-forming fluids and mineralization process, and finally ascertain the possible genetic association between tungsten and gold mineralization. The purpose of this project is set up a new typical example for revealing the relationship between gold and tungsten mineralization hosted in the metamorphic terrane and further establishing a new assemblage model between tungsten and gold deposits. The achievements obtained in this project will promote the development of the metallogenic theory for W and Au mineralization, and will benefit to the theoretical guidance for the prospecting of gold and tungsten deposits.