闪锌矿Re-Os同位素体系是限定铅锌矿床成矿时代和示踪成矿物质来源直接有效的方法。但是该同位素体系在不同类型铅锌矿床或者同一矿床不同成矿阶段表现出不同程度的开放行为，具体的原因并不清楚。初步研究表明，闪锌矿Re-Os同位素体系封闭性或组成可能与闪锌矿的成矿阶段、颜色、结构、形成温度和化学成分有关。这种规律性关系在不同类型矿床中是否普遍存在，需要大量数据验证。本申请拟选择不同成矿温度的三种类型铅锌矿床（岩浆热液型、火山成因块状硫化物型和密西西比河谷型）为研究对象，系统地开展闪锌矿的矿物学和地球化学组成研究，建立闪锌矿的成矿阶段、颜色、结构、成矿温度、化学成分与Re-Os同位素组成的关系，结合闪锌矿的封闭温度研究，确定Re-Os同位素体系封闭性的制约因素，并提出具体的矿物学和地球化学指标，为适合于Re-Os同位素定年的闪锌矿的选择提供参考。

Sphalerite Re-Os isotope system is a direct and efficient method to constrain the mineralization age and trace the metal source. But this isotope system is very unstable for the different types of deposits or different ore stages in the same deposit. The reason for this phenomenon remains unknown. Preliminary studies have indicated that the closure of sphalerite Re-Os isotope system may be possibly related to its ore stage, color, texture, formation temperature and chemical composition. Whether this relation is similar in different types of deposits is unknown. In this study, three types of deposits with various ore-forming temperatures, including magmatic-hydrothermal, volcanic-hosted massive sulfide and Mississippi Valley type Pb-Zn deposits, are selected. The study on mineralogical and geochemical characteristics of sphalerite will be carried out. The link between the ore stage, color, texture, ore-forming temperature, chemical composition and the Re-Os isotope composition will be constrained. Combined with the study of closure temperature, these mineralogical and geochemical characteristics will be used to discuss the factors controlling the closure of the Re-Os isotope system. The specific mineralogical and geochemical indicators will be proposed, which will provide criteria for the selection of sphalerite suitable for Re-Os dating.