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    钦-杭成矿带南段庞西垌断裂带热年代学证据

    丁汝鑫 虞鹏鹏 胡光明 邹和平 曾长育 周永章

    丁汝鑫, 虞鹏鹏, 胡光明, 邹和平, 曾长育, 周永章, 2018. 钦-杭成矿带南段庞西垌断裂带热年代学证据. 地球科学, 43(6): 1830-1838. doi: 10.3799/dqkx.2018.609
    引用本文: 丁汝鑫, 虞鹏鹏, 胡光明, 邹和平, 曾长育, 周永章, 2018. 钦-杭成矿带南段庞西垌断裂带热年代学证据. 地球科学, 43(6): 1830-1838. doi: 10.3799/dqkx.2018.609
    Ding Ruxin, Yu Pengpeng, Hu Guangming, Zou Heping, Zeng Changyu, Zhou Yongzhang, 2018. Thermochronology of Pangxidong Fault Zone in Southern Section of Qin-Hang Metallogenic Belt. Earth Science, 43(6): 1830-1838. doi: 10.3799/dqkx.2018.609
    Citation: Ding Ruxin, Yu Pengpeng, Hu Guangming, Zou Heping, Zeng Changyu, Zhou Yongzhang, 2018. Thermochronology of Pangxidong Fault Zone in Southern Section of Qin-Hang Metallogenic Belt. Earth Science, 43(6): 1830-1838. doi: 10.3799/dqkx.2018.609

    钦-杭成矿带南段庞西垌断裂带热年代学证据

    doi: 10.3799/dqkx.2018.609
    基金项目: 

    国家自然科学基金项目 41472097

    中国地质调查局 12120113067600

    国家留学基金项目 201206385013

    广东省自然科学基金项目 2015A030313193

    国家自然科学基金项目 41102131

    详细信息
      作者简介:

      丁汝鑫(1978-), 男, 副教授, 博士, 主要从事构造地质学研究

    • 中图分类号: P548

    Thermochronology of Pangxidong Fault Zone in Southern Section of Qin-Hang Metallogenic Belt

    • 摘要: 庞西垌断裂带是钦-杭成矿带南段众多NE向韧性剪切带的其中一条,控制着一系列韧性剪切带型银金矿床的分布.对其进行热年代学研究有助于了解钦-杭成矿带南段NE向韧性剪切带的构造演化及其对伴生矿床的控制作用.获得的庞西垌断裂带内糜棱岩中两件白云母40Ar/39Ar总气体年龄分别为221.98±1.16 Ma和223.77±1.16 Ma.据此认为庞西垌断裂带在印支期发生韧性剪切活动,为伴生矿床的形成提供了有利空间;在同一糜棱岩样品中获得的磷灰石、锆石裂变径迹年龄分别为64.83±4.13 Ma和75.69±2.88 Ma,结合热史模拟结果可以得出,庞西垌断裂带在75~60 Ma期间发生了快速冷却作用(6.2 ℃/Ma),与区域整体缓慢冷却过程(1.5 ℃/Ma)差别显著,据此推测庞西垌断裂带可能在约75~60 Ma期间再次发生活动,而庞西垌银金矿床可能形成于晚白垩世.

       

    • 图  1  云开地区及庞西垌银金矿地质图

      断裂名称:1.博白-梧州断裂;2.庞西垌断裂;3.黎村-文地断裂;4.廉江-信宜断裂;5.吴川-四会断裂;据Wang et al.(2013)修改

      Fig.  1.  Tectonic background of Yunkai area and Pangxidong Ag-Au ore deposit

      图  2  庞西垌银金矿1号矿体3、13线剖面

      Fig.  2.  Geological profiles of No.3, 13 for 1# ore body, Pangxidong Ag-Au ore deposit

      图  3  庞西垌断裂带内的糜棱岩显微照片

      Fig.  3.  Microphotograph of mylonite in Pangxidong fault zone

      图  4  白云母40Ar/39Ar阶段激光剥蚀年龄谱

      Fig.  4.  40Ar/39Ar age spectra of muscovite obtained by stepwise laser heating

      图  5  磷灰石、锆石颗粒裂变径迹年龄分布及磷灰石裂变径迹围限径迹长度分布

      Fig.  5.  The apatite and zircon fission track grain ages and apatite confined track length distribution

      图  6  裂变径迹热史模拟

      图 6a6b中分别搜索了100 000和10 000条热史曲线.绿色模拟区域代表可以接受的模拟结果(拟合优度>0.05),紫色模拟区域代表良好的模拟结果(拟合优度>0.5),黑色粗实线代表最终的结果.a.庞西垌断裂带糜棱岩样品裂变径迹热史模拟结果,数据为磷灰石、锆石颗粒裂变径迹年龄(62.68±1.73 Ma、75.69±2.88 Ma);b.云开地区裂变径迹热史模拟结果,数据为区域上前人所有样品(李小明等,2005)的平均磷灰石、锆石裂变径迹年龄(54.56±2.83 Ma、114.91±6.86 Ma)

      Fig.  6.  Thermal history modeling of fission track

      表  1  糜棱岩白云母40Ar/39Ar测年结果

      Table  1.   40Ar/39Ar dating results of muscovite from mylonite

      阶段 累积39Ar释放率 激光功率
      (mW)
      气体体积(10-13 mL) t(Ma) 年龄误差(Ma)
      36Ar 37Ar 38Ar 39Ar 40Ar
      ZMT-B1白云母,J=0.002 2±0.000 011 9
      1 0.002 100 0.41 0.33 0.29 3.74 255.79 136.83 21.51
      2 0.004 150 0.41 0.21 0.25 4.76 274.05 122.18 17.29
      3 0.008 200 0.37 0.70 0.22 7.63 409.18 149.56 15.37
      4 0.014 250 0.39 0.61 0.15 11.20 595.69 162.72 8.98
      5 0.022 300 0.33 0.53 0.22 15.93 832.43 173.96 4.44
      6 0.050 400 0.68 0.88 0.24 52.54 3 049.22 202.90 2.24
      7 0.107 500 1.20 0.84 0.23 111.22 6 651.19 211.44 1.08
      8 0.195 600 1.34 0.60 0.43 170.14 10 397.04 219.04 0.68
      9 0.366 800 2.41 1.28 0.71 331.37 20 598.97 223.36 0.46
      10 0.485 1 000 1.82 0.61 0.43 231.08 14 354.32 222.56 0.66
      11 0.614 1 200 1.78 0.36 0.55 249.29 15 552.21 224.27 0.73
      12 0.825 1 600 2.06 0.48 0.69 408.41 25 578.92 227.29 0.60
      13 0.922 2 000 0.73 0.26 0.37 186.66 11 594.56 226.64 0.86
      14 0.980 2 600 0.37 0.15 0.22 112.12 7 016.10 228.89 1.06
      15 0.996 3 200 -0.10 -0.13 0.07 32.33 2 012.24 234.42 2.32
      16 1.000 4 000 0.07 0.32 -0.04 7.01 441.99 223.00 13.35
      ZMT-B2白云母,J=0.002 2±0.000 011 9
      1 0.001 100 0.42 0.18 0.09 4.04 264.75 133.58 20.75
      2 0.003 150 0.44 0.22 0.07 5.07 317.02 140.87 19.79
      3 0.006 200 0.38 0.45 0.15 7.40 436.80 165.57 10.32
      4 0.010 250 0.18 0.47 0.07 11.09 624.53 193.81 7.83
      5 0.016 300 0.56 0.66 0.11 15.41 881.59 175.38 6.59
      6 0.041 400 1.24 1.10 0.34 69.36 4 310.23 212.34 1.92
      7 0.077 500 1.29 1.51 0.49 99.68 6 096.28 213.98 1.10
      8 0.129 600 1.87 1.50 0.59 142.56 9 104.64 223.29 0.81
      9 0.234 800 2.95 1.54 0.90 289.20 18 030.43 220.97 0.65
      10 0.316 1 000 2.48 1.10 0.49 225.96 14 081.27 220.07 0.76
      11 0.447 1 200 2.76 1.20 0.87 360.45 22 440.23 223.26 0.52
      12 0.622 1 600 4.23 1.39 1.24 482.38 30 697.55 226.96 0.55
      13 0.759 2 000 3.15 1.25 0.94 379.72 24 185.75 227.64 0.68
      14 0.887 2 600 2.47 1.15 0.79 350.14 22 317.35 229.07 0.50
      15 0.954 3 200 1.23 0.81 0.37 186.50 11 726.24 226.53 0.78
      16 1.000 4 000 0.58 0.63 0.26 126.18 7 911.37 228.01 1.16
      下载: 导出CSV

      表  2  糜棱岩磷灰石、锆石裂变径迹测试数据

      Table  2.   Fission track analysis results of apatite and zircon from mylonite

      矿物 颗粒数 自发径迹 诱发径迹 P(χ2) 标准玻璃 总体年龄t(Ma) 1σ
      (Ma)
      平均年龄t(Ma) 1σ
      (Ma)
      平均径迹长度L
      ρs(径迹数)
      (cm-2)
      Ns ρi(径迹数)
      (cm-2)
      Ni ρd(径迹数)
      (cm-2)
      Nd 径迹数量 L±σ(μm)
      磷灰石 70 0.39×106 3 073 1.60×106 12 592 0.92 12.84×105 7 312 64.83 4.13 62.68 1.73 124 12.33±1.85
      锆石 56 7.22×106 6 589 8.98×106 8 203 0.51 20.10×105 10 330 75.69 2.88 75.67 1.20 - -
      注:Ns表示自发径迹数;Ni表示诱发径迹数;Nd表示铀标准玻璃的诱发径迹数.
      下载: 导出CSV
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