投稿时间：2015-04-14
修订日期：2015-07-11
网络发布日期：2016-02-24
中文摘要:小土尔根是近年来阿尔泰诺尔特盆地发现的首例斑岩铜矿床,其成岩 成矿年代学的 研究可以对矿床模型构建、区域成矿规律的总结提供制约。矿区侵入岩发育,矿化受花岗闪 长斑岩控制,少部分赋存在地层中。文章利用LA-ICP-MS锆石U-Pb测年法对矿区岩体进行了 成岩年代学研究。含矿花岗闪长斑岩、黑云二长花岗岩和花岗斑岩中锆石的206P b/238U年龄 的加权平均值分别为(4010±29) Ma、(3981±22) Ma和(4005±20) Ma ,为早泥盆 世同一岩浆侵入活动形成的不同侵入岩。侵入岩年龄结合凝灰岩年龄,将矿区地层划归早泥 盆世诺尔特组。含矿花岗闪长斑岩锆石U-Pb年龄限定小土尔根斑岩铜矿床成矿时代略晚于40 1 Ma,即矿床形成于早泥盆世。
Abstract:The Xiaotuergen deposit is the first porphyry copper deposit discovered in Nuoer te Basin of Altay in recent years. The study of its geochronology will help furt her set up metallogenic model and summarize regional ore-forming pattern. Intrus ive rocks are widely developed in the Xiaotuergen ore district, the mineralizati on is controlled by the granodiorite porphyry, and a small number of ores are ho sted in the strata. In this paper, the authors studied geochronology of intrusiv e rocks and mineralization using zircon LA-ICP-MS U-Pb method. The zircon 206Pb/ 238U-weighted average ages of ore-bearing granodiorite porphyry, bioti te monzoni te granite and granite porphyry are (4010±29) Ma, (3981±22) Ma and (40 05±20) Ma, respectively, suggesting that they were different intrusive rock s from the same magmatism in the Early Devonian. Combining the ages of intrusive roc ks and the tuff, the authors hold that the strata of the Xiaotuergen ore distric t belong to Early Devonian Nuoerte Formation. The zircon U-Pb age of ore-bearing granodiorite porphyry suggests that the Xiaotuergen porphyry copper deposit was formed later than 401Ma, indicating that this deposit was formed in the Early D evonian.
keywords:geochemistry, zircon U-Pb dating, Early Devonian, porphyry copper deposit, Xiaotuergen, Xinjiang
文章编号：
中图分类号：P618.41
文献标志码：
基金项目:本文得到中央级公益性科研院所基本科研业务费专项资金(编号: K1402)和新疆地质矿 产勘查开发局自筹资金项目(编号: XGMB2012019)的联合资助
引用文本：
秦纪华,耿新霞,温超权,郭建新,任宇晨.2016.阿尔泰小土尔根铜矿区岩体LA-ICP-MS锆石U-Pb定年及地质意义[J].矿床地质,35(1):18~32QIN JiHua,GENG XinXia,WEN ChaoQuan,GUO JianXin,REN YuChen.2016.Zircon LA-ICP-MS U-Pb age of intrusion from Xiaotuergen copper deposit in Alta y, Xinjiang, and its geological significance[J].Mineral Deposits35(1):18~32
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