东昆仑拉陵灶火地区斑岩型钼矿成矿流体特征  

CHARACTERISTICS OF ORE-FORMING FLUID FROM THE LALINGZAOHUO PORPHYRY MOLYBDENUM DEPOSIT IN EAST KUNLUN

作　　者：马顺清[1] 李彬 徐云甫[3] 陈静[3] 

机构地区：[1]中国地质大学,北京100083 [2]青海省电力设计院地质勘测室,青海西宁810008 [3]青海省地质调查院,青藏高原北部地质过程与矿产资源重点实验室,青海西宁810012

出　　处：《矿物岩石》2014年第3期23-29,共7页Mineralogy and Petrology

基　　金：国土资源部公益性行业科研专项(201211037);青海省自然科学基金项目(2012-Z-934Q)

摘　　要：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。Lalingzaohuo molybdenum polymetallic deposit is a skarn-porphyry deposit in the East Kunlun metallogenic belt. The fluid inclusions in the ore-quartz veins are studied in order to understand the metallogenic conditions of temperature,pressure and their compositions. It is showed that there are three types of fltaid inclusions, gas-liquid two phase, CO2-containing and CO2-rich three-phase inclusions. Homogenization temperature ranges from 200 ℃ to 350 ℃ and 165℃ to 210 ℃ in quartz-molybdenite veins and quartz sulfide veinlets,respectively. It is a CO2-H2O-NaCl fluid system with salinity ranging from 2. 73% to 16.72 %. Fluid boiling may be due to drastically reduced pressure. The deposit formed in a transition period,at the end of the oceanic subduction and the beginning of the continental collision,and partial melting of the lower crust is the main material sources,characteristic of enriched CO2 in fluids.

关 键 词：流体包裹体 激光拉曼 斑岩型钼矿 拉陵灶火 东昆仑 

分 类 号：P588.311[天文地球—岩石学] P618.65[天文地球—地质学]