东天山小热泉子矿床流体包裹体及矿床成因
Fluid Inclusions Constraints on the Origin of the Xiaorequanzi Deposit in Eastern Tianshan

小热泉子铜矿是东天山最早发现的铜矿床之一，但其成矿流体性质、演化，以及矿床成因尚不明确.通过对不同成矿期次流体包裹体开展显微测温和激光拉曼分析，结果表明小热泉子成矿可分为VMS成矿期(包含黄铁矿、黄铜矿-闪锌矿阶段)、热液叠加期(包含石英-硫化物、碳酸盐阶段)和表生期.VMS成矿期包裹体以水溶液型为主，少量含CO2包裹体，其均一温度为234～392℃，盐度为3.5%～13.3%NaCleqv；热液叠加期包裹体为水溶液型，在122～296 ℃达到均一，盐度为1.4%～12.1%NaCleqv.激光拉曼分析显示包裹体成分以H2O为主，含少量CO2和SO2.小热泉子铜矿早期高温-中高盐度的VMS成矿系统叠加了后期低温-中低盐度的热液系统，其成因类型应为典型的叠加型成矿系统.
The Xiaorequanzi copper deposit is one of the earliest copper deposits discovered in the eastern Tianshan orogen. However, the characters and evolution of oreforming fluid and the metallogenic mechanism remain relatively unclear. The fluid inclusions from different mineralization stages were analyzed by microscopic temperature measurement and laserRaman spectrum in this paper. The mineralization process of the Xiaorequanzi deposit can be divided into VMS, hydrothermal overprinting and supergene mineralization periods. Among them, the VMS period can be subdivided into the pyrite and chalcopyrite sphalerite stages, whilst the hydrothermal overprinting period can be subdivided into the quartzsulfide and carbonate stages. Two types of fluid inclusions were identified in VMS period. The aqueous inclusions yield homogenization temperatures of 234-392℃,with salinities of 3.5%-13.3%NaCleqv. The hydrothermal overprinting period contains aqueous inclusions yielding homogenization temperatures of 122-296℃, with salinities of 1.4%-12.1%NaCleqv. These microthermometric results show that the ore fluid system evolved from high temperature, middlehigh salinity magmatic hydrothermal to low temperature, middlelow salinity seawater. Thus, the deposit could be classified as VMS metallogenic system which has suffered hydrothermal overprinting