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拉陵灶火钼多金属矿床东昆仑成矿带新发现的一个矽卡岩-斑岩型钼多金属矿床,针对该矿床矿化石英脉中的流体包裹体进行温压条件及单个包裹体激光拉曼光谱研究。结果表明,流体包裹体类型主要有气液两相、含CO2三相及富CO2包裹体。测温结果显示石英辉钼矿化阶段包裹体均一温度集中于200℃~350℃,石英硫化物细脉阶段包裹体均一温度集中165℃~210℃。成矿流体的盐度w(NaCl eqv)介于2.73%~16.72%,总体属中低盐度CO2-H2O-NaCl体系。成矿过程中发生过沸腾作用,压力急剧降低,可能产生沸腾作用主要因素。本区斑岩型钼矿形成于洋壳俯冲结束到陆陆碰撞开始的转折期,下地壳的部分熔融是成岩成矿的主要物质源区,因此成矿流体具有富CO2的特征。
A new skarn-porphyry-type molybdenum polymetallic deposit newly discovered in East Kunlun metallogenic belt of Laolingzihu molybdenum polymetallic deposit is used to investigate the temperature and pressure conditions of fluid inclusions in mineralized quartz veins of the deposit and laser exclusion of single inclusions Man spectroscopy. The results show that the main types of fluid inclusions are gas-liquid two-phase, three-phase with CO2 and CO2-rich inclusions. The results of temperature measurement show that the homogenization temperature of inclusions in quartz molybdenum mineralization is concentrated in the range of 200 ℃ ~ 350 ℃, and the homogenization temperature of quartz inclusions in the quartz vein inclusions is 165 ℃ ~ 210 ℃. The salinity w (NaCl eqv) of the ore-forming fluids ranged from 2.73% to 16.72%, which was generally in the medium-low salinity CO2-H2O-NaCl system. In the process of mineralization, boiling occurs, and the pressure drops sharply, which may cause the main factors of boiling. The porphyry molybdenum deposit in this area formed during the transition from the end of oceanic subduction to the beginning of continental collision. The partial melting of the lower crust is the main material source area for diagenetic mineralization. Therefore, the ore-forming fluid is characterized by CO2-rich.