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安徽绩溪伏岭花岗岩LA-ICP-MS锆石U-Pb年龄的精确测定及其地质意义

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陈芳, 王登红, 杜建国, 许卫, 胡海风, 余有林, 汤金来. 安徽绩溪伏岭花岗岩LA-ICP-MS锆石U-Pb年龄的精确测定及其地质意义[J]. 岩矿测试, 2013, 32(6): 970-977.
引用本文: 陈芳, 王登红, 杜建国, 许卫, 胡海风, 余有林, 汤金来. 安徽绩溪伏岭花岗岩LA-ICP-MS锆石U-Pb年龄的精确测定及其地质意义[J]. 岩矿测试, 2013, 32(6): 970-977.
shu
Fang CHEN, Deng-hong WANG, Jian-guo DU, Wei XU, Hai-feng HU, You-lin YU, Jin-lai TANG. New Dating of the Fuling Granite Body with LA-ICP-MS Zircon U-Pb in Jixi,Anhui Province and Their Geological Significance[J]. Rock and Mineral Analysis, 2013, 32(6): 970-977.
Citation: Fang CHEN, Deng-hong WANG, Jian-guo DU, Wei XU, Hai-feng HU, You-lin YU, Jin-lai TANG. New Dating of the Fuling Granite Body with LA-ICP-MS Zircon U-Pb in Jixi,Anhui Province and Their Geological Significance[J]. Rock and Mineral Analysis, 2013, 32(6): 970-977.
shu

安徽绩溪伏岭花岗岩LA-ICP-MS锆石U-Pb年龄的精确测定及其地质意义

  • 1.

    中国地质大学(北京)地球科学与资源学院，北京 100083

  • 2.

    安徽省地质调查院，安徽 合肥 230001

  • 3.

    国土资源部成矿作用与资源评价重点实验室，中国地质科学院矿产资源研究所，北京 100037

  • 4.

    合肥工业大学资源与环境工程学院，安徽 合肥 230009

  • 基金项目:
    中国地质调查局地质矿产远景调查专项“安徽省矿产资源潜力评价”(1212010881616);安徽省公益性地质调查项目“安徽省重要金属成矿区带与邻区成矿地质条件对比研究”(2010-g-14)
详细信息
    作者简介: 陈芳，博士研究生，矿物学、岩石学、矿床学专业。E-mail：chenfang0929@163.com
    通讯作者: 王登红，研究员，博士生导师，主要从事矿产资源研究。E-mail：wangdenghong@sina.com

  • 中图分类号: P578.121;P533;O657.63

New Dating of the Fuling Granite Body with LA-ICP-MS Zircon U-Pb in Jixi,Anhui Province and Their Geological Significance

  • 1.

    School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China

  • 2.

    Geological Survey of Anhui Province,Hefei 230001, China

  • 3.

    Key Laboratory of Metallogeny and Mineral Resource Assessment, Ministry of Land and Resources, Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037, China

  • 4.

    School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China

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    摘要
  • 伏岭岩体位于安徽省南部钦杭东段北部成矿带，周边已发现很多矿床(点)。为探讨岩体与成矿的关系，本次研究采集了伏岭岩体地表新鲜花岗岩样品两件，通过LA-ICP-MS锆石U-Pb测年技术，获得采于伏岭岩体的小昌溪单元的过渡部位的粗粒钾长花岗岩的206Pb/238U加权平均年龄为(129.95±0.70)Ma(n=14)，MSWD=1.7，可以代表小昌溪单元的主体成岩年龄；而采于伏岭岩体的饭蒸尖单元边缘的中细粒钾长花岗岩的206Pb/238U加权平均年龄为(133.9±1.1)Ma(n=8)，MSWD＝1.06，不能代表饭蒸尖单元主体成岩年龄。测试结果与前人野外填图事实相矛盾，这可用岩体由边部向中心逐步冷凝结晶的事实规律得到解释，亦可解释为二者分别代表了岩体的成岩年龄和侵位年龄。伏岭岩体为燕山晚期早阶段(早白垩世)岩浆活动的产物，较前人所得结果老10 Ma左右。本次研究采用的锆石U-Pb同位素测年精度更高，因而更能代表岩体主体形成年龄，研究认为今后有必要开展伏岭岩体与周边矿床(点)成因联系的研究，这对于矿床成因和区域成矿规律的认识具有重要意义。
    The Fuling rock body is located in the eastern section of the northern part of the Qinhang metallogenic belt in southern Anhui Province. There are many deposits (spots) that have been explored around it. 2 fresh granite samples in the surface of Fuling rock body have been collected and the zircons analyzed using LA-ICP-MS method in an attempt to determine the relationship between the rock body and mineralization. The weighted average 206Pb/238U ages for zircons from the coarse-grained K-feldspar granite collected in the transition part of the Xiaochangxi unit is (129.95±0.70) Ma (n=14), MSWD=1.7, which indicates the formation age of the main part of the Xiaochangxi unit. The average 206Pb/238U ages for zircons from the middle-fine-grained K-feldspar granite collected in the edge of the Fanzhengjian unit is (133.9±1.1) Ma(n=8), MSWD=1.06, which is not in agreement with the formation age of the main part of the Fanzhengjian unit. These results contradict with the geological mapping. Either the rocks cooled gradually from the rim inwards, or the two different ages represent the diagenetic age and the emplacement age respectively. The Fuling rock body is the production of magma activity in the early stage of the late Yanshanian Period (early Cretaceous), which is almost 10 Ma older than previous research results. This dating is more representative of the formation age of the rock body according to the high precision of the Zircon U-Pb technology.
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  • 图 1  安徽绩溪伏岭岩体地质简图(据郑勇等[8]修改)

    Figure 1. 

    下载: 全尺寸图片 幻灯片

    图 2  伏岭岩体测年样品照片

    Figure 2. 

    下载: 全尺寸图片 幻灯片

    图 3  伏岭岩体花岗岩样品部分锆石阴极发光图像及测试位置

    Figure 3. 

    下载: 全尺寸图片 幻灯片

    图 4  伏岭花岗岩锆石U-Pb年龄谐和图

    Figure 4. 

    下载: 全尺寸图片 幻灯片

    表 1  伏岭岩体2组花岗岩LA-ICP-MS 锆石 U-Pb U-Pb分析结果

    Table 1.  LA-ICP-MS zircon U-Pb results of the 2 sets of granite from Fuling rock body

    分析点w/10-6同位素比值U-Pb同位素年龄/Ma
    ThUTh/U207Pb/206Pb1σ207Pb/235U1σ206Pb/238U1σ207Pb/206Pb1σ207Pb/235U1σ206Pb/238U1σ
    ZGS516小昌溪单元粗粒花岗岩
    ZGS516-3-6545780.3630.69892 0.04978 0.00110 0.13691 0.00255 0.01995 0.00029 183.4 51.8 130.3 2.3 127.4 1.8
    ZGS516-3-7430774.8450.55490 0.05048 0.00070 0.14089 0.00247 0.02022 0.00020 216.7 36.1 133.8 2.2 129.0 1.3
    ZGS516-3-87601074.580.70708 0.04996 0.00050 0.13640 0.00211 0.01978 0.00024 194.5 24.1 129.8 1.9 126.3 1.5
    ZGS516-3-9216219.8830.98317 0.05123 0.00070 0.14285 0.00228 0.02023 0.00020 250.1 31.5 135.6 2.0 129.1 1.3
    ZGS516-3-10364383.2370.94914 0.05123 0.00039 0.14276 0.00167 0.02022 0.00020 250.1 50.9 135.5 1.5 129.1 1.3
    ZGS516-3-11787918.3210.85672 0.05092 0.00066 0.14282 0.00229 0.02034 0.00021 235.3 29.6 135.5 2.0 129.8 1.4
    ZGS516-3-12450777.9450.57885 0.05113 0.00029 0.14345 0.00137 0.02035 0.00017 255.6 13.0 136.1 1.2 129.9 1.1
    ZGS516-3-14273373.1970.73036 0.05124 0.00053 0.14650 0.00174 0.02074 0.00015 250.1 24.1 138.8 1.5 132.3 0.9
    ZGS516-3-15139131.6241.05485 0.05088 0.00140 0.14134 0.00412 0.02016 0.00024 235.3 63.0 134.2 3.7 128.7 1.5
    ZGS516-3-18740979.2410.75523 0.05120 0.00037 0.14591 0.00215 0.02067 0.00028 250.1 14.8 138.3 1.9 131.9 1.8
    ZGS516-3-19430673.7020.63805 0.05019 0.00029 0.14258 0.00180 0.02059 0.00023 211.2 13.0 135.3 1.6 131.4 1.5
    ZGS516-3-22226224.5491.00563 0.05069 0.00174 0.14671 0.00386 0.02106 0.00049 227.8 79.6 139.0 3.4 134.3 3.1
    ZGS516-3-24201212.5460.94378 0.05087 0.00062 0.14371 0.00192 0.02052 0.00017 235.3 27.8 136.3 1.7 131.0 1.1
    ZGS516-3-25312464.120.67284 0.05119 0.00039 0.14298 0.00146 0.02028 0.00017 250.1 16.7 135.7 1.3 129.4 1.0
    XY516饭蒸尖单元钾长花岗岩
    XY516-4-2232218.2991.06286 0.04612 0.00187 0.12855 0.00252 0.02022 0.00045 400.1 -301.8 122.8 2.3 129.1 2.8
    XY516-4-45291438.730.36795 0.04992 0.00020 0.14592 0.00113 0.02121 0.00015 190.8 11.1 138.3 1.0 135.3 0.9
    XY516-4-6337203.991.65237 0.04846 0.00085 0.13909 0.00261 0.02084 0.00027 120.5 40.7 132.2 2.3 132.9 1.7
    XY516-4-8565858.8770.65833 0.04967 0.00051 0.14449 0.00170 0.02110 0.00019 189.0 28.7 137.0 1.5 134.6 1.2
    XY516-4-16249280.1010.88946 0.05030 0.00145 0.14416 0.00394 0.02081 0.00032 209.3 66.7 136.7 3.5 132.8 2.0
    XY516-4-17839865.2720.96994 0.05025 0.00037 0.14518 0.00172 0.02094 0.00018 205.6 21.3 137.6 1.5 133.6 1.2
    XY516-4-1865.566.70970.98134 0.05139 0.00270 0.14654 0.00728 0.02073 0.00049 257.5 122.2 138.9 6.4 132.3 3.1
    XY516-4-20634522.1871.21450 0.05029 0.00053 0.14308 0.00281 0.02061 0.00035 209.3 24.1 135.8 2.5 131.5 2.2
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