| 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 |
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| 引用本文： | 秦纪华,耿新霞,温超权,郭建新,任宇晨.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,2016,35(1):18-32. |
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| 作者姓名： | 秦纪华 耿新霞 温超权 郭建新 任宇晨 |
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| 作者单位： | 1. 新疆地质矿产勘查开发局第四地质大队,新疆阿勒泰,836500;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. 新疆大学地质勘查与工程学院,新疆乌鲁木齐,830046 |
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| 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 |
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| 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206Pb/238U年龄的加权平均值分别为(401.0±2.9)Ma、(398.1±2.2)Ma和(400.5±2.0)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401 Ma,即矿床形成于早泥盆世。
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| 关 键 词： | 地球化学 锆石U-Pb定年 早泥盆世 斑岩铜矿床 小土尔根 新疆 |
| 收稿时间： | 2015/4/14 0:00:00 |
| 修稿时间： | 2015/7/11 0:00:00 |
Zircon LA-ICP-MS U-Pb age of intrusion from Xiaotuergen copper deposit in Alta y, Xinjiang, and its geological significance |
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| QIN JiHu,GENG XinXi,WEN ChaoQuan,GUO JianXin and REN YuChen.Zircon LA-ICP-MS U-Pb age of intrusion from Xiaotuergen copper deposit in Alta y, Xinjiang, and its geological significance[J].Mineral Deposits,2016,35(1):18-32. |
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| Authors: | QIN JiHu GENG XinXi WEN ChaoQuan GUO JianXin and REN YuChen |
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| Institution: | No.4 Geological Party, Xinjiang Bureau of Geology and Mineral Exploration and Development, Altay 836500, Xinjiang, China,MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China,No.4 Geological Party, Xinjiang Bureau of Geology and Mineral Exploration and Development, Altay 836500, Xinjiang, China,No.4 Geological Party, Xinjiang Bureau of Geology and Mineral Exploration and Development, Altay 836500, Xinjiang, China and College of Geology & Prospecting Engineering Program, Xinjiang University, Urumqi 830046, Xinjiang, China |
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| Abstract: | The Xiaotuergen deposit is the first porphyry copper deposit discovered in Nuoerte Basin of Altay in recent years. The study of its geochronology will help further set up metallogenic model and summarize regional ore-forming pattern. Intrusive rocks are widely developed in the Xiaotuergen ore district, the mineralization is controlled by the granodiorite porphyry, and a small number of ores are hosted in the strata. In this paper, the authors studied geochronology of intrusive rocks and mineralization using zircon LA-ICP-MS U-Pb method. The zircon 206Pb/238U-weighted average ages of ore-bearing granodiorite porphyry, biotite monzonite granite and granite porphyry are(401.0±2.9) Ma,(398.1±2.2) Ma and(400.5±2.0) Ma, respectively, suggesting that they were different intrusive rocks from the same magmatism in the Early Devonian. Combining the ages of intrusive rocks and the tuff, the authors hold that the strata of the Xiaotuergen ore district 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 Devonian. |
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| Keywords: | geochemistry zircon U-Pb dating Early Devonian porphyry copper deposit Xiaotuergen Xinjiang |
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