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    赞比亚卢弗里安弧构造带再活化的证据:锆石和磷灰石裂变径迹年代学

    任军平 王杰 张东红 DokoweA.P. ChikambweE.M. 左立波 许康康 刘晓阳 贺福清

    任军平, 王杰, 张东红, DokoweA.P., ChikambweE.M., 左立波, 许康康, 刘晓阳, 贺福清, 2018. 赞比亚卢弗里安弧构造带再活化的证据:锆石和磷灰石裂变径迹年代学. 地球科学, 43(6): 1850-1860. doi: 10.3799/dqkx.2018.610
    引用本文: 任军平, 王杰, 张东红, DokoweA.P., ChikambweE.M., 左立波, 许康康, 刘晓阳, 贺福清, 2018. 赞比亚卢弗里安弧构造带再活化的证据:锆石和磷灰石裂变径迹年代学. 地球科学, 43(6): 1850-1860. doi: 10.3799/dqkx.2018.610
    Ren Junping, Wang Jie, Zhang Donghong, Dokowe A. P., Chikambwe E. M., Zuo Libo, Xu Kangkang, Liu Xiaoyang, He Fuqing, 2018. Reactivation of Lufilian Arc in Zambia: Zircon and Apatite Fission Track Chronology. Earth Science, 43(6): 1850-1860. doi: 10.3799/dqkx.2018.610
    Citation: Ren Junping, Wang Jie, Zhang Donghong, Dokowe A. P., Chikambwe E. M., Zuo Libo, Xu Kangkang, Liu Xiaoyang, He Fuqing, 2018. Reactivation of Lufilian Arc in Zambia: Zircon and Apatite Fission Track Chronology. Earth Science, 43(6): 1850-1860. doi: 10.3799/dqkx.2018.610

    赞比亚卢弗里安弧构造带再活化的证据:锆石和磷灰石裂变径迹年代学

    doi: 10.3799/dqkx.2018.610
    基金项目: 

    中国地质调查局项目 1212011220910

    中国地质调查局项目 121201006000150014

    商务部技术援外项目 [2012]558

    商务部技术援外项目 [2015]352

    详细信息
      作者简介:

      任军平(1980-), 男, 高级工程师, 从事地质矿产勘查与研究工作

      通讯作者:

      王杰

    • 中图分类号: P618

    Reactivation of Lufilian Arc in Zambia: Zircon and Apatite Fission Track Chronology

    • 摘要: 锆石和磷灰石裂变径迹年代学对揭示构造热事件的形成及演化过程具有重要的研究意义.利用锆石和磷灰石裂变径迹测试及热史模拟探讨了卢弗里安弧构造带自泛非构造运动以来的构造热演化过程.谦比希铜矿床和恩昌加铜(钴)矿床位于卢弗里安弧铜-钴成矿带中的赞比亚境内.对采自该两个矿床中的5件新鲜岩石样品进行挑选,获得了5件锆石和4件磷灰石样品.首次获得了卢弗里安弧构造带中的裂变径迹年龄,5件锆石样品的年龄分别为265±22 Ma、230±10 Ma、228±9 Ma、225±9 Ma和221±10 Ma.4件磷灰石样品的年龄分别为145±10 Ma、133±10 Ma、130±10 Ma和92±9 Ma,径迹长度介于(11.4±2.4)~(11.8±2.4)μm.从热历史模拟结果可看出,从300~260 Ma,古地温持续降低至90 ℃左右;随后,缓慢降低至现今的地表温度.对比卢弗里安弧构造带、赞比西构造带和达马拉构造带中的年龄数据,研究表明非洲中南部地区二叠纪-白垩纪的构造活动是一个区域性的构造活动事件.

       

    • 图  1  卢弗里安弧地区地质图及重要矿床位置

      Muchez et al.(2010)修改

      Fig.  1.  Geological map of the Lufilian arc and major ore deposits

      图  2  样品的镜下特征

      QJ2.变质粉砂岩;QJ3.变质长石石英砂岩;EJ1.变质砂岩;EJ2.变质砂岩;EJ3.变质砂岩;Kfs.钾长石;Q.石英;Ms.白云母;Bi.黑云母;Cc.方解石

      Fig.  2.  Microphotographs of the dating samples

      图  3  锆石样品裂变径迹单颗粒年龄雷达图、直方图及其年龄频率曲线

      Fig.  3.  Radial plots and histograms and frequency curves of zircon single grain fission track ages

      图  4  磷灰石样品裂变径迹长度直方图、单颗粒年龄雷达图、直方图及其年龄频率曲线

      Fig.  4.  Confined track length histograms radial plots and histograms and frequency curves of apatite single grain fission track ages

      图  5  QJ2-2样品热历史模拟结果

      t1.实测年龄;t2.模拟年龄;MTL-GOF.径迹长度拟合参数;Age-GOF.年龄拟合参数

      Fig.  5.  Modeling results of ecological thermal evolution history

      图  6  中南部非洲前寒武纪地质构造简图

      Haest and Muchez(2011)修改

      Fig.  6.  Precambrian tectonic sketch map in central-southern Africa

      表  1  样品采样位置

      Table  1.   Location of samples

      样品编号 经纬度 岩石类型 主要矿物组合 采样位置 对应地层单元
      QJ2 28°1′59″E
      12°39′5″S
      变质粉砂岩 石英、黑云母、白云母、绿帘石和方解石 谦比希西矿体 罗安群
      QJ3 28°1′59″E
      12°39′5″S
      变质长石石英砂岩 石英、钾长石、黑云母、绿泥石和方解石 谦比希西矿体 罗安群
      EJ1 27°52′15″E
      12°30′36″S
      变质砂岩 石英和长石,少量白云母 恩昌加矿体 罗安群
      EJ2 27°52′15″E
      12°30′36″S
      变质砂岩 石英和长石,少量黑云母、白云母、绿泥石、阳起石和粘土矿物 恩昌加矿体 罗安群
      EJ3 27°52′15″E
      12°30′36″S
      变质砂岩 石英、钾长石、黑云母、白云母、方解石和绿泥石 恩昌加矿体 罗安群
      下载: 导出CSV

      表  2  锆石裂变径迹分析结果

      Table  2.   Zircon fission track analytical results

      样品编号 锆石颗粒数 ρs(105/cm2)(Ns) ρi(105/cm2)(Ni) ρd(105/cm2)(Nd) P(χ2)(%) 中心年龄t(Ma)(±1σ)
      QJ2-1 5 217.023
      (960)
      50.865
      (225)
      14.006
      (8 055)
      25.9 265±22
      QJ3-1 30 118.602
      (7 170)
      33.099
      (2 001)
      14.375
      (8 055)
      85.0 230±10
      EJ1-1 26 120.552
      (5 937)
      36.225
      (1 784)
      14.867
      (8 055)
      40.1 221±10
      EJ2-1 35 122.312
      (8 789)
      36.837
      (2 647)
      15.359
      (8 055)
      36.1 228±9
      EJ3-1 33 130.325
      (7 251)
      40.997
      (2 281)
      15.851
      (8 055)
      53.8 225±9
      注:ρs为自发径迹密度,ρi为诱发径迹密度,ρd为标准径迹密度,Ns为自发径迹数,Ni为诱发径迹数,Nd为标准径迹数.
      下载: 导出CSV

      表  3  磷灰石裂变径迹分析结果

      Table  3.   Apatite fission track analytical results

      样品编号 磷灰石颗粒数 ρs(105/cm2)
      (Ns)
      ρi(105/cm2)
      (Ni)
      ρd(105/cm2)
      (Nd)
      P(χ2)(%) 中心年龄t
      (Ma)(±1σ)
      径迹长度L(μm)
      (N)
      QJ2-2 35 1.283
      (353)
      2.880
      (792)
      14.640
      (6 788)
      84.7 133±10 11.7±2.5
      (99)
      QJ3-2 30 3.573
      (842)
      7.423
      (1 749)
      14.849
      (6 788)
      2.6 145±10 11.8±2.4
      (111)
      EJ2-2 34 3.244
      (966)
      7.936
      (2 363)
      15.163
      (6 788)
      0 130±10 11.4±2.4
      (104)
      EJ3-2 35 2.621
      (455)
      7.569
      (1 314)
      13.178
      (6 788)
      0 92±9 11.5±2.0
      (95)
      注:ρs为自发径迹密度,ρi为诱发径迹密度,ρd为标准径迹密度,Ns为自发径迹数,Ni为诱发径迹数,Nd为标准径迹数, N为径迹长度数.
      下载: 导出CSV
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    • 收稿日期:  2018-01-28
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