延边天宝山多金属矿床的矿物流体包裹体激光探针^(40)Ar/^(39)Ar测年及其地质意义  

ORE-FORMING GEOLOGICAL SIGNIFICANCE AND ^(40)Ar/^(39)Ar LASER PROBE DATING FOR FLUID INCLUSIONS IN MINERAL FROM TIANBAOSHAN POLYMETALLIC DEPOSIT,YANBIAN

作　　者：张勇[1] 孙景贵[1] 松权衡 赵志 陈冬[3] 门兰静[1] 白令安[1] 韩世炯[1] 

机构地区：[1]吉林大学地球科学学院,吉林长春130061 [2]吉林省地质调查研究院,吉林长春130061 [3]江苏省地质调查研究院,江苏南京210018

出　　处：《矿物岩石》2011年第2期42-47,共6页Mineralogy and Petrology

基　　金：国家自然科学基金(40772052);中国地质调查局计划工作项目(资[2010]26-06)

摘　　要：延边天宝山为一座大型中高温热液多金属(铅,锌,铜,钼等)矿床,由新兴铅锌、立山铅锌铜和东风铅锌铜钼3个中型矿床所组成,研究采用单矿物流体包裹体的40Ar/39Ar激光探针定年法对其含矿石英脉进行了精细的年代学测定以确定该矿床形成时代和成矿流体来源;实验室获得的40Ar/39Ar正反等时线年龄分别为(175±10)Ma和(175±18)Ma;经验证实剔除部分接近大气的成分点和过剩氩的成分点,重新计算的正、反等时线年龄分别为(179±11)Ma和(179.1±9.8)Ma,MSWD分别为0.95和0.99,40Ar/36Ar比值分别为297.8±2.7,297.6±2.5;结合区域地质特征,认为天宝山多金属矿床的成矿应发生在早侏罗世晚期,成矿流体是以岩浆热液为主、少量大气水和地壳流体参与的混合流体。The large scale Tianbaoshan hydrothermal polymetallic（lead,zinc,copper,molybdenum） deposit is composed of three medium polymetallic deposits,including the Xinxing lead-zinc deposit,Lishan lead-zinc-copper and the Dongfeng lead-zinc-copper-molybdenum deposit.Ore bearing quartz veins are selected to determine the time and source origin of the ore deposit by means of single mineral fluid inclusion 40Ar/39Ar laser probe dating.It is showed that the quartz veins yield an isochron 40Ar/39Ar age of 175 Ma±10 Ma and an inverse one of（175 ± 18） Ma,respectively.Eliminating some data with superfluous Ar and those close to atmosphere,it reacquired the 40Ar/39Ar age,isochron 40Ar/39Ar age of 179 Ma±11 Ma（MSWD=0.95） and an inverse age of 179.1 Ma±9.8 Ma（MSWD=0.99） with 40Ar/36Ar ratios of（297.8±2.7） and（297.6 ±2.5）,respectively.Combining with previous research,the mineralization time of Tianbaoshan polymetallic deposit is the late period of the Early Jurassic,and the mineralization fluid is a kind of mixed fluid with major magmatic hydrothermal fluid,with minor atmospheric water and crustal fluids.

关 键 词：单颗粒石英 流体包裹体 40Ar/39Ar激光探针定年 天宝山多金属矿床 

分 类 号：P618.510.4[天文地球—矿床学]