马厂箐斑岩型铜、钼矿辉钼矿Re-Os年龄及地质意义  

Molybdenite Re-Os Age and Other Geological Meaning of Machangqing Porphyry Copper,Molybdenum Deposit

作　　者：邢俊兵[1,2] 郭晓东[1,2] 屈文俊[3] 王治华[2] 李汉光[4] 

机构地区：[1]中国地质大学,北京100083 [2]武警黄金地质研究所,河北廊坊065000 [3]国家地质实验测试中心,北京100037 [4]武警黄金第三总队,四川成都610036

出　　处：《黄金科学技术》2009年第5期24-29,共6页Gold Science and Technology

基　　金："十一五"国家攻关项目(编号:2006BAB01B10);武警黄金指挥部专项基金(编号:HJ07-02)联合资助

摘　　要：滇西马厂箐富碱侵入岩体为多期、多阶段岩浆活动叠加侵入的复式岩体，其岩浆活动时限为52～29Ma，最早岩浆活动始于52Ma，中期岩浆活动为47～42Ma，晚期岩浆活动为37～29Ma。采用ICP—MS法测定宝兴厂斑岩型铜、钼矿中的辉钼矿Re-Os同位素年龄，获得其模式年龄为34．9±0．8～36．0±0．5Ma，加权平均值为35．3±0．7Ma，指示了马厂箐铜、钼矿床的成矿时限为35～36Ma左右。这种方法获得的年龄与马厂箐复式杂岩体晚期花岗斑岩（29～37Ma）相吻合，表明成矿作用主要与晚期岩浆侵入活动有关。马厂箐铜、钼多金属矿床存在2种矿体产出形态和矿物组合形式，均属于同期成矿作用的产物，是同期成矿作用在不同空间部位上的不同表现形式，属于同一个成矿系统。金沙江-哀牢山成矿带斑岩型铜、钼矿床是同期成矿作用的产物，成矿时限集中在35—36Ma。Machangqing alkalite intrusive rock is muhiperiodic and multistage magmatic activity superimposed intrusive composite rock in west of Yunnan. The time limit of magmatic activity is 52 -29 Ma, the earliest time began at 52 Ma, mid time of it is 47 - 42 Ma, and the latter time of it is 37 - 29 Ma. Using ICP-MS testing the age of molybdenite Re-Os isotope of Baoxingchang porphyry copper, molybdenum deposit, get the pattern age is 34.9 ±0.8- 36.0 ± 0.5 Ma,the average of it is 35.3 ±0.7 Ma, which indicated that metallogenic time limit is about 35 - 36 Ma. The result of above tallied with later granite-porphyry （29 -37 Ma） of Machangqing complex rock, showed that mineralization mainly related with later magmatic invasive activity. The existing two ore occurrence shape and mineral compound form of Machangqing copper, molybdenum poly metallic ore deposit belonged to the production of syn-mineralization; the different representation in different space of syn-mineralization, belonged to same mineralization system. Porphyry copper, molybdenum deposit of Jinshajiang-Ailaoshan mineralization belt was the production of the syn-mineralization, and mineralization time limit focused in 35 -36 Ma.

关 键 词：RE-OS同位素 辉钼矿 成矿年龄 富碱斑岩 马厂箐铜钼矿 云南省 

分 类 号：P578.291[天文地球—矿物学]