福建福安赤路钼矿床辉钼矿Re-Os同位素年龄及其地质意义  

Re-Os isotopic dating of molybdenite from the Chilu molybdenum deposit in Fu'an,Fujian Province

作　　者：张克尧[1,2] 王建平[1] 杜安道[3] 林仟同[2] 黄金明[2] 胡荣华[2] 黄庆敏[2] 

机构地区：[1]中国地质大学,北京100083 [2]福建省闽北地质大队,福建邵武654000 [3]国家地质实验测试中心,北京100037

出　　处：《中国地质》2009年第1期147-155,共9页Geology in China

基　　金：福建地矿局综合研究项目资助。

摘　　要：本文使用电感耦合等离子体质谱仪TJA X-series ICP-MS对赤路钼矿床中的辉钼矿进行同位素年龄测定,获得了赤路钼矿床中辉钼矿的Re-Os同位素模式年龄为105～106 Ma。这一年龄与研究区内与钼矿床成矿关系密切的似斑状花岗岩、二长花岗岩、钾长文象花岗岩形成时代较为吻合,均属燕山晚期岩浆活动的产物。这项研究为在浦城—宁德北西向成矿带燕山晚期岩浆活动、成矿作用以及浦城—宁德与上杭—云霄两条北西向成矿带的对比研究及找矿工作,提供了直接的年代学证据。At present, Re-Os isotopic dating of molybdenite is one of the direct ways to acquire the ore-forming age. Using TJA X-series ICP-MS, the authors dated five molybdenite samples collected from the Chilu molybdenum deposit and obtained model ages. The results show that the ore-forming age is about 105-106 Ma, quite close to the emplacement age of porphyritoid granite, adamellite and feldspar graphic granite （115 ±4 Ma, Rb-Sr isochron age）, which are intimately related to the ore-forming processes in this area. This indicates that they are all products of late Yanshanian magrnatism. The above outcome provides direct evidence not only for the research of late Yanshanian magrnatism and mineralization in the Pucheng-Ningde NW-trending ore belt but also for the comparative study between the Pucheng-Ningde ore-forming belt and the Shanhang-Yuenxiao ore-forming belt, thus contributing to mineral exploration in these two belts.

关 键 词：RE-OS同位素 成矿年龄 赤路钼矿床 福建省 

分 类 号：P618.65[天文地球—矿床学]