投稿时间：2013-03-05
修订日期：2014-01-06
网络发布日期：2014-04-26
中文摘要:首次采用锆石SHRIMP微区U-Pb测年技术，对新疆西天山哈勒尕提铜铁多金属矿床成矿岩体进行了年代学研究，通过对角闪石黑云母二长花岗岩中单颗粒锆石12个样品点的分析，获得206Pb/238U年龄介于362.7~381.7 Ma，加权平均值为（367.3±2.2）Ma，表明岩体的结晶年龄为晚泥盆世。通过ICP-MS法测定了哈勒尕提铜铁多金属矿床中的辉钼矿Re-Os同位素年龄，获得其模式年龄的加权平均值为（370.1±2.4）Ma，等时线年龄为（371±12）Ma，代表了哈勒尕提铜铁多金属矿床的成矿年龄。两种测年方法获得的年龄在误差范围内基本一致，因此该测试结果表明哈勒尕提铜铁多金属矿床与晚泥盆世角闪石黑云母二长花岗岩侵入作用密切相关，角闪石黑云母二长花岗岩为哈勒尕提铜铁多金属矿床的形成提供了成矿物质和热源。
中文关键词:地球化学 锆石SHRIMP U-Pb年龄 Re-Os同位素 哈勒尕提铜铁多金属矿床 西天山 新疆
Abstract:The first high-precision dating of the mineralization and rock-forming process in the Halegati Cu-Fe polymetallic deposit of West Tianshan Mountains was conducted in this paper. The zircon SHRIMP U-Pb dating of the Halegati Cu-Fe polymetallic deposit yielded a group of ages, in which 12 analyses presented 206Pb/238U concordant ages from 362.7 Ma to 381.7 Ma, with a weighted mean age of (367.3±2.2) Ma, which suggests that the crystallization epoch of the rock body is late Devonian. In addition, the 187Re and 187Os values of molybdenite from the Halegati Cu-Fe polymetallic deposit were determined by inductively coupled plasma mass sperctrometry (ICP-MS), with analytical errors of Re and Os between 0.04 and 0.56. The results show that the Re-Os model ages of the deposit are between 368.7 Ma and 384.6 Ma, the weighted average of model ages is (370.1±2.4) Ma,and the isochron age is (371±12) Ma. The authors obtained the same age from the two kinds of methods, which should represent the ore-forming age of the Halegati Cu-Fe polymetallic deposit, and it indicates that the rock-forming age is almost identical with the ore-forming age. The test result suggests that the Halegati Cu-Fe polymetallic deposit was closely related to the intrusion of late Devonian Hornblende biotite adamellite, and the hornblende biotite adamellite had close connection with metallogeny and provided metallogenic materials and heat for the Halegati Cu-Fe polymetallic deposit.
keywords:geochemistry zircon SHRIMP U-Pb dating Re-Os isotope Halegati Cu-Fe polymetallic deposit West Tianshan Mountains Xinjiang
文章编号：
中图分类号：P618.41;P618.31
文献标志码：
基金项目:本研究得到中国地质调查局我国典型三稀金属矿床研究与靶区优选（12120113078200）、新疆北部晚古生代大规模岩浆作用与成矿耦合关系研究（1212011121092）、新疆西天山斑岩铜矿找矿突破研究（1212011085069）、中央高校基本科研业务费专项资金（CHD2010JC128）和长安大学基础研究支持计划专项基金项目的共同资助
引用文本：
高景刚,李文渊,薛春纪,张照伟,刘拓,董福辰,闫永红.2014.新疆哈勒尕提铜铁矿床的成矿年代学研究[J].矿床地质,33(2):386~396GAO JingGang,LI WenYuan,XUE ChunJi,ZHANG ZhaoWei,LIU Tuo,DONG FuChen,YAN YongHong.2014.Zircon SHRIMP U-Pb and molybdenite Re-Os dating of Halegati Cu-Fe polymetallic deposit in West Tianshan Mountains and its geological implications[J].Mineral Deposits33(2):386~396
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