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| 宁芜盆地闪长玢岩的形成时代及对成矿的指示意义 | |
| 引用本文： | 范裕,周涛发,袁峰,张乐骏,钱兵,马良.宁芜盆地闪长玢岩的形成时代及对成矿的指示意义[J].岩石学报,2010,26(9):2715-2728. |
| 作者姓名： | 范裕 周涛发 袁峰 张乐骏 钱兵 马良 |
| 作者单位： | 1. 合肥工业大学资源与环境工程学院,合肥,230009 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;Centre of Excellence in Ore Deposits(CODES),University of Tasmania,Private Bag 79,Hobart,Australia 4. Centre of Excellence in Ore Deposits(CODES),University of Tasmania,Private Bag 79,Hobart,Australia |
| 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项目(SinoProbe-03)、国家"深部探测技术与实验研究专项计划"专题(SinoProbe-03-02-05)、中国科学院矿产资源研究重点实验室开放课题、安徽省地质勘查专项费项目(2007-1)、新世纪优秀人才支持计划项目(NCET-10-0324)和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)联合资助. |
| 摘 要： | 宁芜盆地是长江中下游成矿带的重要组成部分和玢岩型铁矿床的主要产地,盆地内广泛产出闪长玢岩,这类岩体与铁矿床的形成关系密切,但其精确的成岩成矿时代及其形成构造背景的研究仍十分薄弱。本次工作在详细野外地质工作的基础上,系统开展了盆地内与铁矿床有关的7个闪长玢岩体的年代学研究,通过对闪长玢岩锆石LA-ICP-MS同位素定年方法,确定了盆地内主要闪长玢岩体,凹山岩体、陶村岩体、和尚桥岩体、东山岩体、白象山岩体、和睦山岩体和姑山岩体的成岩时代分别为130.2±2.0Ma、130.7±1.8Ma、131.1±1.5Ma、131.1±3.1Ma、130.0±1.4Ma、131.1±1.9Ma和129.2±1.7Ma。定年结果表明盆地内闪长玢岩成岩年龄均为130Ma左右,其成岩年龄可以近似代表铁矿床的成矿年龄。长江中下游地区存在145～136Ma、135～127Ma、126～123Ma三期成岩(成矿)作用,宁芜盆地内闪长玢岩是第二期岩浆活动的产物,其形成时代明显晚于长江中下游成矿带断隆区内与斑岩型-矽卡岩型铜(铁)、金矿床有关的高钾钙碱性岩体。宁芜盆地内闪长玢岩及玢岩型铁矿床形成于区域岩石圈伸展构造环境。 |
| 关 键 词： | 成岩时代 玢岩型铁矿床 宁芜盆地 长江中下游成矿带 构造环境 |
| 收稿时间： | 2010/7/15 0:00:00 |
| 修稿时间： | 2010/8/22 0:00:00 |
Geochronology of the diorite porphyrites in Ning-Wu basin and their metallogenic significances. |
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| FAN Yu,ZHOU TaoF,YUAN Feng,ZHANG LeJun,QIAN Bing and MA Liang.Geochronology of the diorite porphyrites in Ning-Wu basin and their metallogenic significances.[J].Acta Petrologica Sinica,2010,26(9):2715-2728. | |
| Authors: | FAN Yu ZHOU TaoF YUAN Feng ZHANG LeJun QIAN Bing and MA Liang |
| Institution: | 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;Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, 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;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;School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,China |
| Abstract: | Ning-Wu basin is the important parts of the Middle-Lower Yangtze River Valley metallogenic belt, where there are widespread porphyry-like type(magnetite-apatite type) iron deposits. However, the researches on precise ore-forming and magmatic activity epoch and tectonic setting are very weak. Based on detailed field geological work, we carried out systematic geochronological study of diorite porphyrite plutons related to porphyry-like type iron deposits in the basin. LA-ICP-MS zircon U-Pb dating for seven diorite porphyrite plutons such as Washan, Taocun, Heshangqiao, Dongshan, Baixiangshan, Hemushan and Gushan intrusions, has been carried out. LA-ICP-MS zircon U-Pb dating yield the ages of 130.2±2.0Ma, 130.7±1.8Ma, 131.1±1.5Ma, 131.1±3.1Ma, 130.0±1.4Ma, 131.1±1.9Ma and 129.2±1.7Ma for intrusions respectively. The dating result indicates that different diorite porphyrite plutons in Ning-Wu volcanic basin are all formed in the early stage of Early Cretaceous about 130Ma, which can nearly represent the metallogenetic epoch of the porphyry-like type iron deposits. There are three periods (145~136Ma, 135~127Ma, 126~123Ma) of ore-forming and magmatic activity in the Middle-Lower Yangtze River Valley metallogenic belt. The diorite porphyrite plutons in Ning-Wu basin were the products of the second period magmatic activity and obviously later than the high-k calc-alkaline intrusions related to skarn-porphyry Cu-Au deposits in uplift areas in the Middle-Lower Yangtze River Valley metallogenic belt. The diorite porphyrite plutons in Ning-Wu volcanic basin were thought to be formed under regional lithospheric and thinning environment. |
| Keywords: | Metallogenic epoch Porphyry-like type iron deposits Ning-Wu volcanic basin Middle-Lower Yangtze River Valley metallogenic belt Tectonic setting |
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