新疆西天山奈楞格勒矿田七兴铅锌多金属矿床Rb-Sr等时线年龄及其地质意义  

Rb-Sr isochron age of Qixing Pb-Zn polymetallic deposit in Nailenggele ore field of Western Tianshan,Xinjiang,and its geological significance

作　　者：张立成[1,2] 王义天[2] 董连慧[3] 张兵[4] 万阈[4] 赵强[4] 王攀[1] 

机构地区：[1]中国冶金地质总局青岛地质勘查院,山东青岛266000 [2]中国地质科学院矿产资源研究所,国土资源部成矿作用与资源评价重点实验室,北京100037 [3]新疆维吾尔自治区地质矿产勘查开发局,新疆乌鲁木齐830000 [4]新疆维吾尔自治区地质矿产勘查开发局第七地质大队,新疆乌苏833300

出　　处：《矿床地质》2014年第1期153-164,共12页Mineral Deposits

基　　金：中国地质调查局地质大调查项目(1212011085527)资助

摘　　要：奈楞格勒矿田位于西天山博罗霍洛成矿带中北部，主要发育莱历斯高尔铝矿床、3571铜矿床和七兴铅锌多金属矿床。其中，七兴铅锌多金属矿床产于矿田的东北部，赋存于上志留统博罗霍洛山组碎屑岩中，矿体受NE向断裂控制，呈脉状产出。对七兴铅锌多金属矿床石英-硫化物阶段的闪锌矿进行的Rb-Sr同位素测年研究，获得等时线年龄为（362．2±4．9）Ma，表明矿床形成于晚泥盆世—早石炭世。闪锌矿的（^87Sr／^86Sr）；值为0．7103～0．7107，平均值为0．7105，指示成矿物质是以幔源为主的壳幔混合来源。结合前人的研究成果认为，七兴铅锌多金属矿床是奈楞格勒矿田在海西期区域性构造-岩浆-热液成矿作用的产物。Located in the central north part of the Boluohuoluo metallogenic belt in Western Tianshan Mountains, the Nailenggele ore field is mainly composed of the Lailisigaoer Mo deposit, the No. 3571 Cu deposit and the Qixing Pb-Zn polymetallic deposit. The Qixing Pb-Zn polymetallic deposit is hosted in clastic rocks of the upper Silurian Boluohuoluoshan Formation in the northeast of the Nailenggele ore field. The ore bodies occur as veins, con- trolled by NE-trending faults. In this paper, the Rb-Sr isotopic dating was carried out for the sphalerite of the quartz-sulfide stage in the Qixing Pb-Zn polymetallic deposit, which yielded an isochron age of （362.2±4.9） Ma, suaggesting that the deposit was formed in Late Devonian-Early Carboniferous period. The ^87Sr/^86Sri val-ues of the sphalerite vary in the range of 0. 7103～0. 7107 with an average of 0. 7105, indicating that ore-form- ing materials were mainly derived from the mantle. In combination with regional geology, the authors hold that the Qixing Pb-Zn polymetallic deposit was formed by the regional intense tectono-magrnatic-hydrothermal metal- logenic process in the Nailenggele ore field in Hercynian period.

关 键 词：地球化学 RB-SR等时线年龄 闪锌矿 成矿时代 奈楞格勒七兴 西天山 

分 类 号：P618.42[天文地球—矿床学] P618.43[天文地球—地质学]