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安徽庐枞盆地井边铜矿床的成矿时代及其找矿指示意义
引用本文:张乐骏,周涛发,范裕,袁峰,马良,钱兵.安徽庐枞盆地井边铜矿床的成矿时代及其找矿指示意义[J].岩石学报,2010,26(9):2729-2738.
作者姓名:张乐骏  周涛发  范裕  袁峰  马良  钱兵
作者单位:1. 合肥工业大学资源与环境工程学院,合肥230009;Centre of Excellence in Ore Deposits(CODES),University of Tasmania,Private Bag 79,Hobart,Australia
2. 合肥工业大学资源与环境工程学院,合肥230009;中国科学院矿产资源研究重点实验室,北京100029
3. 合肥工业大学资源与环境工程学院,合肥,230009
基金项目:本文受国家自然科学基金项目(40830426、40803015)、国家深部探测技术与实验研究专项第三专题(SinoProbe-03)、安徽省地质勘查专项费项目(2005-51、2007-1)、中国科学院矿产资源研究重点实验室开放课题、澳大利亚塔斯马尼亚大学国家优秀矿床研究中心科研基金(CODES2009P2-3)和新世纪优秀人才支持计划项目(NCET-10-0324)联合资助.
摘    要:庐枞盆地是长江中下游多金属成矿带中一个重要的多金属矿集区,盆地内发育有多个不同规模的脉状铜矿床。目前对这些脉状铜矿床的成矿时代和构造背景等方面的研究工作还较少。本文以盆地中目前最具代表性的井边铜矿床为研究对象,分别对矿床中的安山斑岩次火山岩体和主成矿阶段石英中流体包裹体采用了LA-ICP-MS锆石U-Pb同位素定年和Ar-Ar同位素定年,获得了安山斑岩LA-ICP-MS锆石U-Pb年龄为133.2±1.7Ma,石英流体包裹体Ar-Ar等时线年龄为133.3±8.3Ma,反等时线年龄为133.3±8.2Ma。这一结果与实际的矿床地质特征和区内岩浆岩已有的同位素年代学数据完全吻合,因而井边铜矿床的形成时代为早白垩世,与盆地中砖桥旋回侵入岩浆活动有关。这一矿化事件与长江中下游地区第二期(135~127Ma)大规模成岩成矿作用相对应,并对应于区域拉张的构造背景。通过本次研究工作,不仅为深入理解庐枞盆地内铜矿化的规律提供了资料,同时也为该区的下一步铜矿找矿工作提供了依据。

关 键 词:脉状铜矿床  流体包裹体  Ar-Ar定年  LA-ICP-MS锆石U-Pb定年  庐枞盆地  找矿潜力
收稿时间:2010/7/10 0:00:00
修稿时间:2010/8/22 0:00:00

Dating of copper mineralization in Jingbian deposit and its prospecting significance in Luzong basin, Anhui Province.
ZHANG LeJun,ZHOU TaoF,FAN Yu,YUAN Feng,MA Liang and QIAN Bing.Dating of copper mineralization in Jingbian deposit and its prospecting significance in Luzong basin, Anhui Province.[J].Acta Petrologica Sinica,2010,26(9):2729-2738.
Authors:ZHANG LeJun  ZHOU TaoF  FAN Yu  YUAN Feng  MA Liang and QIAN Bing
Institution:School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009,China;Centre of Excellence in Ore Deposit(CODES),University of Tasmania,Private Bag 79,Hobart,Australia;School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009,China;Key Laboratory of Mineral Resources, Chinese Academy of Sciences, Beijing 100029, China;School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009,China;School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009,China;School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009,China;School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009,China
Abstract:Luzong basin is one of the most important metallogenic district in the mineralization belt of the Middle and Lower Reaches of the Yangtze River area, where occurs many vein-type copper deposits with various scales. Nevertheless, little research work has been done on the timing and tectonic setting of these deposits. In this paper we present the LA-ICP-MS zircon U-Pb dating results of andesite porphyry and fluid inclusions Ar-Ar dating results of quartz from Jingbian vein-type copper deposit. LA-ICP-MS zircon U-Pb dating yield the age of 133.2±1.7Ma, and fluid inclusions in quartz yield an isochronal age of 133.3±8.3Ma and an inverse isochronal age of 133.3±8.2Ma respectively. These results coincident with the geological characteristics of deposits and the available highly precise dating of related magmatic rocks. So the Jingbian vein-type copper deposit took place in Early Cretaceous and related to the intrusive activity of Zhuanqiao Formation. This mineralization event in Luzong basin were consistent with the second period (135~127Ma) magmatic and metallogenic activity in the Middle and Lower Reaches of the Yangtze River area, and corresponding to an extension tectonic environment. This contribution is not only providing evidence for a comprehensive understanding the magnetism and mineralization of the Luzong basin, but also shows the prospecting potential to find cooper deposit in this area.
Keywords:Vein-type copper deposit  Fluid inclusions  Ar-Ar dating  LA-ICP-MS zircon U-Pb dating  Luzong basin  Prospecting potential
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