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东天山东戈壁钼矿床辉钼矿Re-Os年龄及印支期成矿事件
引用本文:吴艳爽,项楠,汤好书,周可法,杨永飞.东天山东戈壁钼矿床辉钼矿Re-Os年龄及印支期成矿事件[J].岩石学报,2013,29(1):121-130.
作者姓名:吴艳爽  项楠  汤好书  周可法  杨永飞
作者单位:1. 中国科学院新疆生态与地理研究所新疆矿产资源研究中心,乌鲁木齐,830011
2. 中国科学院地球化学研究所矿床地球化学国家重点实验室,贵阳,550002
3. 北京大学造山带与地壳演化重点实验室,北京,100871
基金项目:本文受国家自然科学基金项目(U1139301、U1129302)资助.
摘    要:东戈壁超大型钼矿床位于新疆境内的东天山觉罗塔格成矿带.8件辉钼矿样品Re-Os同位素年龄介于228.7±2.7Ma ~ 241.7±0.9Ma,等时线年龄为231.9±6.5Ma(95%置信度,MSWD =0.71),加权平均年龄为238.5±3.7Ma(95%置信度,MSWD=5.8).其中,最小的辉钼矿Re-Os年龄与矿区内斑状花岗岩年龄(227.6±1.3Ma)一致,表明成岩和成矿作用发生在三叠纪.7件辉钼矿样品Re含量为26.51×10-6~91.34×10-6,指示成矿物质主要来自古生代增生作用形成的不成熟大陆壳.已有成矿年龄显示了印支期成矿事件在东天山地区非常显著,发生于大陆碰撞造山体制.

关 键 词:辉钼矿Re-Os同位素年龄  东戈壁钼矿  印支成矿作用  大陆碰撞作用  东天山
收稿时间:2012/9/25 0:00:00
修稿时间:2012/11/20 0:00:00

Molybdenite Re-Os isotope age of the Donggebi Mo deposit and the Indosinian metallogenic event in eastern Tianshan
WU YanShuang,XIANG Nan,TANG HaoShu,ZHOU KeFa and YANG YongFei.Molybdenite Re-Os isotope age of the Donggebi Mo deposit and the Indosinian metallogenic event in eastern Tianshan[J].Acta Petrologica Sinica,2013,29(1):121-130.
Authors:WU YanShuang  XIANG Nan  TANG HaoShu  ZHOU KeFa and YANG YongFei
Institution:Xinjiang Research Center for Mineral Resources, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;Xinjiang Research Center for Mineral Resources, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;Xinjiang Research Center for Mineral Resources, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;Key Laboratory of Orogen and Crust Evolution, Peking University, Beijing 100871, China
Abstract:The Donggebi giant Mo deposit is located in the Qoltag metallogenic belt, eastern Tianshan, Xinjiang. Eight molybdentie samples from the deposit yield Re-Os isotope ages ranging from 228.7±2.7Ma to 241.7±0.9Ma, with an isochron age of 231.9±6.5Ma (95% confidence, MSWD=0.71), and a weighted mean age of 238.5±3.7Ma (95% confidence, MSWD=5.8). The lowest molybdenite Re-Os age (228.7±2.7Ma) agrees well with the age (227.6±1.3Ma) of the parental porphyritic granite at the deposit, indicating that the magmatism and Mo-mineralization occurred in Triassic. The Re contents in seven molybdenite samples range from 26.51×10-6 to 91.34×10-6, suggesting that the ore-forming metals were mainly sourced from an immature continental crust which was likely formed in Paleozoic subduction-related accretion. Compiling of the available isotope ages obtained from the mineral systems in eastern Tianshan area shows that the Indosinian mineralization was significant in the eastern Tianshan orogenic belt. The Indosinian mineralization occurred in continental collision regime.
Keywords:Molybdentie Re-Os isotope age  Donggebi Mo deposit  Indosinian mineralization  Continental collision  Eastern Tianshan
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