关键词: 流体包裹体, 多金属矿田, 成矿模式, 金属矿床, 天宝山, 延边

Abstract: The Tianbaoshan polymetallic ore field is composed of Xinxing lead-zinc deposit, Lishan lead-zinc-copper deposit and Dongfeng lead-zinc-copper-molybdenum deposit. Both Xinxing and Lishan are hosted in contact zone between Jurassic granodiorite, diorite and Paleozoic marine volcanic rocks-sedimentary rock and the Dongfeng deposit occurs in rock bodies. The research on the geological features of these ore deposits shows that the Xinxing lead-zinc deposit is featured by filling of quartz sulfide in breccia pipe, similar to alteration characteristics of the mesothermal magmatic ore deposit; Dongfeng lead-zinc-copper-molybdenum deposit develops disseminated sulfide orebodies, quartz sulfide veins and molybdenite-quartz vein, showing characteristic of contact metasomatic-hydrothermal deposit; while a lot of magnetite, galena, sphalerite and other metal sulfides are found in Xinxing lead-zinc deposit, which suggests it be a representative contact metasomatic skarn deposit. Based on the research of fluid inclusions in quartz from main mineralizing stages and late ore-forming stage, it can be concluded that ore-forming process of the Xinxing deposit can be divided into three stages, quartz-pyrite, quartz-sphalerite-galena-chalcopyrite and quartz-carbonate. Homogenization temperatures of fluid inclusion formed in these three atages are  270-340 ℃, 190-260 ℃, 130-160 ℃, respectively. The salinity(w(NaCl)) of the inclusion changes from 0.62% to 9.86%, the density from 0.37 g/cm3 to 1.00 g/cm3 and the pressure from 37.31 MPa to 87.69 MPa. Laser Raman spectroscopy analysis of the fluid inclusions reveals they mainly consist of CO₂ and H₂O, with minor CH₄ and N₂. The mineralization of the Dongfeng deposit went through three stages: quartz-molybdenite（280-337 ℃）, quartz-sphalerite-galena-chalcopyrite(200-260 ℃) and quartz-carbonate(101-190 ℃), salinity and density of fluid inclusions for Dongfeng deposit range from 7.16% to 23.95%, and from 0.96 g/cm³  to 1.12 g/cm³, respectively, with the pressure raging from 28.23 MPa to 56.64 MPa， and analysis from Laser Raman spectroscopy shows the major compositions in the inclusions is H₂O. The mineralization of the Lishan lead-zinc-copper deposit can be divided into three stages, they are magnetite-quartz(210-240 ℃), quartz-galena-sphalerite-chalcopyrite(170-200 ℃) and quartz-carbonate(126-160 ℃), salinity and density of fluid inclusions from that deposit range from 2.07% to 9.47%, and from 0.89 g/cm³ to 0.92 g/cm³, respectively, with the pressure of 33.88-59.72 MPa, the study on Laser Raman spectroscopy showes that the component of fluid inclusions is mainly composed of CO₂ and CH₄. Combined with the geological features of ore deposit, properties and sources of the metallogenic fluids, the metallogenic model of the Tianbaoshan polymetallic ore field has been constructed.

Key words: fluid inclusions, polymetallic ore field, metallogenic model, ore deposits, Tianbaoshan, Yanbian