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    豫西小秦岭地区秦南金矿床热液独居石U-Th-Pb定年及其地质意义

    强山峰 毕诗健 邓晓东 郭连巧 李建威

    强山峰, 毕诗健, 邓晓东, 郭连巧, 李建威, 2013. 豫西小秦岭地区秦南金矿床热液独居石U-Th-Pb定年及其地质意义. 地球科学, 38(1): 43-56. doi: 10.3799/dqkx.2013.005
    引用本文: 强山峰, 毕诗健, 邓晓东, 郭连巧, 李建威, 2013. 豫西小秦岭地区秦南金矿床热液独居石U-Th-Pb定年及其地质意义. 地球科学, 38(1): 43-56. doi: 10.3799/dqkx.2013.005
    QIANG Shan-feng, BI Shi-jian, DENG Xiao-dong, GUO Lian-qiao, LI Jian-wei, 2013. Monazite U-Th-Pb Ages of the Qinnan Gold Deposit, Xiaoqinling District: Implications for Regional Metallogenesis and Tectonic Setting. Earth Science, 38(1): 43-56. doi: 10.3799/dqkx.2013.005
    Citation: QIANG Shan-feng, BI Shi-jian, DENG Xiao-dong, GUO Lian-qiao, LI Jian-wei, 2013. Monazite U-Th-Pb Ages of the Qinnan Gold Deposit, Xiaoqinling District: Implications for Regional Metallogenesis and Tectonic Setting. Earth Science, 38(1): 43-56. doi: 10.3799/dqkx.2013.005

    豫西小秦岭地区秦南金矿床热液独居石U-Th-Pb定年及其地质意义

    doi: 10.3799/dqkx.2013.005
    基金项目: 

    国家自然科学基金项目 41202052

    国家自然科学基金项目 90814004

    中央高校基本科研业务费专项资金 CUG110833

    中央高校基本科研业务费专项资金 CUG120102

    地质过程与矿产资源国家重点实验室科技部专项基金 MSFGPMR201005

    详细信息
      作者简介:

      强山峰(1971-), 男, 高级工程师, 矿产普查与勘探专业.E-mail: dkqsf@163.com

      通讯作者:

      李建威, E-mail: jwli@cug.edu.cn

    • 中图分类号: P631

    Monazite U-Th-Pb Ages of the Qinnan Gold Deposit, Xiaoqinling District: Implications for Regional Metallogenesis and Tectonic Setting

    • 摘要: 小秦岭地区是我国最重要的金矿产区之一, 目前对该区金矿床成矿作用存在两种不同的观点, 即与秦岭造山带造山作用有关的早中生代成矿和与中国东部构造体制大转折有关的晚中生代成矿.在矿床地质研究的基础上, 利用激光剥蚀ICP-MS方法对小秦岭矿集区北矿带秦南金矿床的热液独居石进行了U-Th-Pb定年, 获得了高精度的年龄数据, 为北矿带金矿床成矿时代和成矿构造背景提供了新的制约.岩相学研究表明, 所研究的独居石具有完好的晶形, 与载金矿物黄铁矿和石英的结构关系表明它们近于同时形成.13个独居石颗粒的U-Th-Pb同位素组成在206Pb/238U-207Pb/235U和206Pb/238U-208Pb/232Th图解上均位于谐和线上或其附近, 其206Pb/238U和208Pb/233Th加权平均年龄分别为120.9±0.9 Ma(MSWD=1.0)和122.6±1.9 Ma(MSWD=2.6), 在误差范围内完全一致.本次定年结果与小秦岭南矿带众多典型金矿床的Re-Os年龄和40Ar/39Ar年龄一致, 表明独居石的U-Th-Pb同位素体系自矿物形成后一直处于封闭体系, 其U-Pb和U-Th-Pb年龄可以解释为秦南金矿床的成矿时代, 从而表明秦南金矿床形成于燕山期.对已有可靠年龄数据的统计分析表明, 小秦岭地区绝大多数金矿床形成于早白垩世, 证明该区金成矿作用集中发生于晚中生代, 可能与华北克拉通岩石圈减薄作用有关.

       

    • 图  1  华北南缘小秦岭金矿区域地质和金矿床分布图(据黎世美等, 1996, 略有简化)

      Fig.  1.  Simplified geological map of the Xiaoqinling gold district, southern North China Craton and the distribution of major gold deposits (modified from Li et al., 1996)

      图  2  秦南金矿矿区地质简图(张元厚等,2009)

      Fig.  2.  Geological sketch map of Qinnan gold deposit, Xiaoqinling district showing the distribution and occurrence of gold lodes

      图  3  秦南金矿床矿石矿物及共生组合

      a.黄铁矿“之”字形追踪张裂隙内充填了晚期石英脉,矿物内部的孔隙内有黄铜矿充填;b.针硫铋铅矿及自然金交代黄铁矿;c.叶片状辉钼矿穿插交代方铅矿;d.碲化物集合体溶蚀交代方铅矿;e.碲、硒、铋、镍矿物交代黄铜矿、磁黄铁矿;f.自然铋、楚碲铋矿、碲银矿、含硒方铅矿共生交代黄铜矿、磁黄铁矿.Py.黄铁矿;Cp.黄铜矿;Po.磁黄铁矿;(Se-)Gn.(含硒)方铅矿;Mo.辉钼矿;Aik.针硫铋铅矿;Au.自然金;Bi.自然铋;Tsu.楚碲铋矿;Hes.碲银矿;Alt.碲铅矿;Qz.石英;Cal.方解石

      Fig.  3.  Reflected-light photomicrographs of ore minerals from Qinnan gold deposit

      图  4  秦南金矿床热液独居石与石英、黄铁矿等载金矿物的共生关系

      a.中细粒独居石颗粒发生碎裂,形成微细裂隙或呈孤岛状被石英充填,并与黄铁矿紧密共生;b.半自形独居石与黄铁矿、石英共边生长,并包裹有黄铁矿、石英等热液矿物;Qz.石英;Mnz.独居石;Py.黄铁矿

      Fig.  4.  Textural relationship between hydrothermal monazite and quartz and pyrite from the Qinnan gold deposit

      图  5  秦南金矿床热液独居石U-Th-Pb谐和曲线图

      a.206Pb/238U-207Pb/235U谐和图;b.208Pb/232Th-206Pb/238U谐和图

      Fig.  5.  Concordia U-Pb (a) and U-Th-Pb diagrams (b) of hydrothermal monazite grains from the Qinnan gold deposit obtained by LA-ICP-MS analysis

      表  1  秦南金矿床热液独居石LA-ICPMS锆石U-Pb分析结果

      Table  1.   Results of LA-ICPMS monazite U-Pb dating from Qinnan gold deposit

      测试点号 U-Th-Pb同位素比值 年龄(Ma)
      207Pb/235U 206Pb/238U 208Pb/232Th 207Pb/235U 206Pb/238U 208Pb/232Th
      QN25-1 0.127 29 0.008 85 0.018 64 0.000 18 0.006 11 0.000 08 122 8 119 1 123 2
      QN25-2 0.129 83 0.181 18 0.019 44 0.001 60 0.006 17 0.000 12 124 164 124 10 124 2
      QN25-3 0.126 69 0.022 78 0.019 12 0.000 25 0.005 99 0.000 08 121 21 122 2 121 2
      QN25-4 0.012 11 0.129 06 0.019 48 0.001 07 0.006 78 0.000 09 12 130 124 7 137 2
      QN25-5 0.068 17 0.004 53 0.018 79 0.000 11 0.005 91 0.000 06 67 4 120 1 119 1
      QN25-6 0.114 55 0.027 75 0.019 09 0.000 32 0.006 13 0.000 07 110 25 122 2 124 1
      QN25-7 0.128 73 0.072 78 0.018 71 0.000 55 0.006 30 0.000 09 123 66 119 3 127 2
      QN25-8 0.247 24 0.063 33 0.018 95 0.000 44 0.006 22 0.000 09 224 52 121 3 125 2
      QN25-9 0.129 11 0.011 35 0.019 32 0.000 18 0.006 07 0.000 07 123 10 123 1 122 2
      QN25-10 0.130 13 0.050 44 0.018 83 0.000 40 0.006 16 0.000 08 124 45 120 3 124 2
      QN25-11 0.000 00 0.050 44 0.019 47 0.000 57 0.007 18 0.000 10 0 0 124 4 145 2
      QN25-12 0.129 45 0.090 28 0.019 36 0.000 71 0.006 65 0.000 09 124 81 124 5 134 2
      QN25-13 0.000 00 0.000 00 0.019 32 0.000 48 0.006 77 0.000 11 0 0 123 3 136 2
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