投稿时间：2014-07-26
修订日期：2014-10-01
网络发布日期：2015-05-06
中文摘要:铜山矿床是位于大兴安岭北段多宝山矿田中的一个大型铜矿床。文章对该矿区含矿英云闪长岩进行了详细的LA-MC-ICP-MS锆石U-Pb定年、主量元素、微量元素及同位素地球化学研究。锆石U-Pb定年结果表明, 英云闪长岩侵位于(461±1) Ma。岩石显示埃达克质岩的地球化学特征, 具有高w(SiO2)(62.5%~64.53%)和w(Al2O3)(14.77% ~ 17.7%), 高w(Sr)(394×10-6 ~ 804×10-6), 低w(Y)(7.78×10-6 ~ 10.3×10-6)和w(Yb)(0.8×10-6 ~ 1.04×10-6), 轻稀土元素富集, 重稀土元素亏损, 无明显Eu异常。锆石εHf(t)值介于11.6 ~ 13.5。金属硫化物的δ34S值为-1.3‰ ~ -0.4‰, 206Pb/204Pb、207Pb/204Pb和208Pb/204Pb值分别为17.591~18.453、15.449~ 15.551和37.280~37.999。这些特征表明, 铜山矿床英云闪长岩形成于大陆边缘弧环境, 是加厚下地壳部分熔融的产物。成矿物质主要来自于英云闪长岩及多宝山组火山岩。
Abstract:The Tongshan deposit is a large copper deposit located in the Duobaoshan orefield within the northern Da Hinggan Mountains. This paper reports LA-MC-ICP-MS zircon U-Pb age, major and trace elements, and isotopic geochemistry of the ore-related tonalite in the Tongshan deposit. LA-MC-ICP-MS zircon U-Pb dating yielded the crystallization age of (461±1) Ma for the tonalite. The tonalite shows characteristics of adakitic affinity, i.e., high SiO2 (62.5% ~ 64.53%), Al2O3 (14.77%~17.7%) and Sr (394×10-6 ~ 804×10-6), low Y (7.78×10-6 ~10.3×10-6) and Yb (0.8×10-6 ~ 1.04×10-6), slight Eu anomalies, rich light rare-earth elements and depleted heavy rare-earth elements. The zircon Hf isotope analysis shows εHf(t) values of 11.6 to 13.5. δ34S values of sulfides are between -1.3‰ and -0.4‰, similar to data associated with magmatic-hydrothermal systems. 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb ratios vary from 17.591 to 18.453, 15.449 to 15.551, and 37.280 to 37.999, respectively. The tonalite was formed in a continental marginal arc setting, and originated from partial melting of the thickened lower crust. The ore-forming materials were derived from the volcanic rocks of the Duobaoshan Formation and tonalite.
文章编号：
中图分类号：P618.41;P597
文献标志码：
基金项目:本文得到中国地质调查局地质调查项目(12120113093600)和国家自然科学基金项目(41172081)联合资助
引用文本：
刘军,周振华,何哲峰,欧阳荷根.2015.黑龙江省铜山铜矿床英云闪长岩锆石U-Pb年龄及地球化学特征[J].矿床地质,34(2):289~308LIU Jun,ZHOU ZhenHua,HE ZheFeng,OUYANG HeGen.2015.Zircon U-Pb dating and geochemistry of ore-bearing tonalite in Tongshan copper deposit, Heilongjiang Province[J].Mineral Deposits34(2):289~308
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