新疆希勒库都克铜钼矿床辉钼矿Re-Os年龄及其地质意义  

Molybdenite Re-Os age of Xilekuduke Cu-Mo deposit in Xinjiang and its geological significance

作　　者：龙灵利[1] 王玉往[1] 杜安道[2] 王京彬[1] 王莉娟[1] 王书来[1] 蒲克信[1] 屈文俊[2] 

机构地区：[1]北京矿产地质研究院,北京100012 [2]国家地质实验测试中心,北京100037

出　　处：《矿床地质》2011年第4期635-644,共10页Mineral Deposits

基　　金：国家重点基础研究发展规划项目(编号:2007CB411304和2001CB409806)的资助

摘　　要：新疆富蕴县内的希勒库都克铜钼矿床是与花岗斑岩有关的斑岩型铜钼矿床。通过对矿石中8件辉钼矿Re-Os同位素的测定,得到了(326.6±7.1)Ma^(333.1±4.6)Ma的模式年龄,加权平均年龄为(329.4±1.6)Ma,一个相关性很好的等时线年龄(327.1±2.9)Ma,表明其形成于早石炭世中期,它可能形成于同碰撞向后碰撞造山转换时期或后碰撞造山早期阶段。该矿床辉钼矿的w(Re)为117.8×10-6~572.1×10-6,反映其成矿物质可能主要来源于地幔源区。The Xilekuduke deposit in Fuyun County of Xinjiang belongs to a porphyry Cu-Mo deposit related to granite porphyry.Seven samples of molybdenite were analyzed for Re-Os isotopic dating,and model ages of（326.6±7.1） Ma to（333.1 ±4.6） Ma were obtained.A weighted mean model age of（329.4 ±1.6） Ma is well fitted with isochron age of（327.1 ±2.9） Ma.This dating result suggests that the ore deposit was formed in a transitional stage from syn-collision to post-collision or early post-collision stage during middle Early Carboniferous.Rhenium content of molybdenite samples from the Xilekuduke Cu-Mo deposit ranges from 118×10-6 to 572×10-6,implying that its ore-forming material mainly originated from mantle source.

关 键 词：地球化学 铜钼矿床 RE-OS同位素年龄 希勒库都克 新疆 

分 类 号：P618.41[天文地球—矿床学] P618.65[天文地球—地质学]