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    彬县-铜川地区延长组油页岩晚白垩世以来的抬升剥蚀与冷却历史

    于强 任战利 朱增伍 陶霓 王宝江 李长春

    于强, 任战利, 朱增伍, 陶霓, 王宝江, 李长春, 2018. 彬县-铜川地区延长组油页岩晚白垩世以来的抬升剥蚀与冷却历史. 地球科学, 43(6): 1839-1849. doi: 10.3799/dqkx.2018.596
    引用本文: 于强, 任战利, 朱增伍, 陶霓, 王宝江, 李长春, 2018. 彬县-铜川地区延长组油页岩晚白垩世以来的抬升剥蚀与冷却历史. 地球科学, 43(6): 1839-1849. doi: 10.3799/dqkx.2018.596
    Yu Qiang, Ren Zhanli, Zhu Zengwu, Tao Ni, Wang Baojiang, Li Changchun, 2018. Exhumation, Cooling and Erosion History of Triassic Oil Shale since Late Cretaceous, Binxian-Tongchuan Area of Ordos Basin. Earth Science, 43(6): 1839-1849. doi: 10.3799/dqkx.2018.596
    Citation: Yu Qiang, Ren Zhanli, Zhu Zengwu, Tao Ni, Wang Baojiang, Li Changchun, 2018. Exhumation, Cooling and Erosion History of Triassic Oil Shale since Late Cretaceous, Binxian-Tongchuan Area of Ordos Basin. Earth Science, 43(6): 1839-1849. doi: 10.3799/dqkx.2018.596

    彬县-铜川地区延长组油页岩晚白垩世以来的抬升剥蚀与冷却历史

    doi: 10.3799/dqkx.2018.596
    基金项目: 

    鄂尔多斯盆地东南部三叠系油页岩盆地演化模拟专题研究 213027170400

    国家自然科学基金项目 41602128

    国家自然科学基金项目 41703055

    中央高校"双一流"引导专项 300104282708

    中央高校基本科研业务费资助项目 310827171009

    国家自然科学基金项目 41630312

    详细信息
      作者简介:

      于强(1983-), 男, 副教授, 博士, 研究方向为盆地构造热演化史与低温热年代学

    • 中图分类号: P542;P597

    Exhumation, Cooling and Erosion History of Triassic Oil Shale since Late Cretaceous, Binxian-Tongchuan Area of Ordos Basin

    • 摘要: 利用古温标与热年代学数据共同恢复油页岩的隆升冷却历史对于研究油页岩成矿的热背景有着重要的理论意义.利用钻孔ZK900磷灰石(U-Th)/He测年数据,结合已有的永参1井磷灰石裂变径迹资料分别获得铜川地区和彬县地区延长组油页岩晚白垩世以来的古地温、抬升冷却期次、抬升冷却速率及剥蚀厚度等数据,并对比了两个地区油页岩经历的构造热演化史的差异性.ZK900钻孔长6、长9和长10段磷灰石He年龄均值依次为43.83 Ma、31.87 Ma和22.88 Ma.铜川地区油页岩晚白垩世以来经历了97~40 Ma快速抬升、40~8 Ma缓慢抬升和8 Ma以来快速抬升3个阶段,剥蚀厚度及抬升速率分别为600 m、10.5 m/Ma,10 m、0.3 m/Ma和1 290 m、161.3 m/Ma,对应的古温度及冷却速率分别为100~60 ℃、0.70 ℃/Ma,60~50 ℃、0.22 ℃/Ma和50~25 ℃、2.90 ℃/Ma.彬县地区延长组油页岩晚白垩世以来经历了3期抬升冷却过程:97~40 Ma,持续抬升冷却(130~75 ℃),冷却速率为0.96 ℃/Ma,抬升速率为14.4 m/Ma,剥蚀厚度820 m;40~8 Ma温度基本未变(75~70 ℃),抬升/冷却速率均很低,分别为1.9 m/Ma与0.16 ℃/Ma,剥蚀厚度60 m;8 Ma以来急剧降温(70~31 ℃),抬升速率125 m/Ma,冷却速率4.88 ℃/Ma,剥蚀厚度1 000 m.彬县-铜川地区三叠系油页岩晚白垩世以来经历了3个抬升阶段,始新世40 Ma和中新世8 Ma为该套油页岩成矿后期冷却的关键时刻.研究表明,彬县地区和铜川地区抬升冷却和剥蚀历史具有一定的差异性,在今后油页岩成矿及后期改造研究中应区别分析.

       

    • 图  1  鄂尔多斯盆地彬县—铜川地区地质图

      Q.第四系;J2z.直罗组;P2s.石盒子组;T2e.二马营组;O1m.马家沟组;N2.上新统;J1y.延安组;P1s.山西组;T2z.纸纺组;C.寒武系;K1l.洛河组;T3w.瓦窑堡组;P1t.太原组;T1h.和尚沟组;K1h.华池组;T3y.延长组;C3t.本溪组;T1l.刘家沟组;K1y.宜君组;T2t.铜川组;O2+3.中上奥陶系;P2sh.石盒子组

      Fig.  1.  Geological map of the Binxian-Tongchuan area, Ordos basin

      图  2  钻孔ZK900地层综合柱状图

      黑色虚线条隔开3块样品的采集层段

      Fig.  2.  Stratigraphic column of drilling ZK900

      图  3  永参1井晚白垩世以来抬升冷却史

      Fig.  3.  Exhumation-cooling history since Late Cretaceous, well Yongcan1

      图  4  延长组油页岩构造热演化史

      a.永参1井;b.ZK900

      Fig.  4.  Tectonic thermal evolution history of oil shale, Yanchang Formation

      表  1  钻孔ZK900磷灰石(U-Th)/He年龄

      Table  1.   (U-Th)/He ages of apatite, ZK900

      样品 4He(10-9 mL) ± U(mg/kg) ± Th(mg/kg) ± Th/U Ft Mass(10-6 g) tU(Ma) tF(Ma) ± S(10-6 m)
      ZK900-6-1 0.120 0 0.003 1 5.06 0.14 22.06 0.56 4.47 0.77 7.07 13.63 17.61 0.43 70.9
      ZK900-6-2 0.958 7 0.024 0 32.15 0.87 80.71 2.02 2.58 0.71 4.56 33.83 47.58 1.06 54.5
      ZK900-6-3* 2.209 2 0.055 5 205.99 5.61 232.63 5.95 1.16 0.70 2.83 24.69 35.24 0.82 51.4
      ZK900-6-4 0.304 0 0.007 7 14.44 0.40 34.39 0.93 2.44 0.68 2.83 39.22 57.38 1.25 49.7
      ZK900-6-5* 0.405 6 0.010 2 37.31 1.04 98.39 2.68 2.71 0.63 2.49 22.16 35.12 0.71 42.7
      ZK900-9-1 17.408 9 0.436 0 278.67 8.01 136.74 3.83 0.50 0.79 6.93 66.54 84.54 2.37 71.0
      ZK900-9-2 0.238 9 0.006 0 10.43 0.31 27.08 0.82 2.66 0.71 3.33 35.20 49.85 1.16 53.6
      ZK900-9-3* 0.049 6 0.001 3 10.46 0.35 49.29 1.47 4.83 0.57 1.09 16.97 29.52 0.58 37.7
      ZK900-9-4* 0.057 0 0.001 5 18.34 0.53 47.64 1.31 2.66 0.57 0.95 16.67 29.33 0.55 36.5
      ZK900-9-5 0.149 7 0.003 8 14.59 0.42 6.11 0.18 0.43 0.76 5.41 14.26 18.79 0.51 62.7
      ZK900-10-1* 1.090 5 0.027 3 61.22 1.76 38.38 1.03 0.64 0.79 8.21 15.63 19.74 0.55 72.8
      ZK900-10-2 0.242 3 0.006 1 26.49 0.83 9.74 0.32 0.38 0.70 2.46 28.27 40.35 1.06 50.3
      ZK900-10-3* 0.071 0 0.001 8 2.28 0.08 14.65 0.46 6.59 0.76 6.66 15.32 20.28 0.53 66.2
      ZK900-10-4 1.975 6 0.049 5 130.76 3.59 110.20 2.84 0.86 0.75 5.04 20.66 27.46 0.70 61.7
      ZK900-10-5 0.550 5 0.013 8 16.01 0.44 53.70 1.36 3.44 0.78 8.45 18.74 24.05 0.58 71.9
      注:Ft为校正系数;校正年龄(F. Age)=未校正年龄(U.Age)/Ft;颗粒编号带*的数据可用于古地温恢复; Mass为单颗粒的总重量.
      下载: 导出CSV

      表  2  永参1井YC-01样品磷灰石裂变径迹测试结果

      Table  2.   Apatite fission-track data of sample YC-01, well Yongcan1

      Ns Ni S(10-6 cm3) ti(Ma) Ns Ni S(10-6 cm3) ti(Ma)
      13 84 122 28.5 102 625 123 30.1
      15 61 155 45.3 21 121 153 32
      5 28 90 32.9 74 590 165 23.1
      41 280 128 27 11 62 137 32.7
      21 145 106 26.7 30 165 106 33.5
      23 120 137 35.3 22 130 245 31.2
      24 96 154 46 12 100 142 22.1
      16 114 155 25.9 10 64 138 28.8
      注:颗粒数为16个;统计误差σ=5.802×10-22 cm2S为观测面积;ρs.238U自发裂变径迹密度,为1.950×105ρi.235U诱发裂变径迹密度,为1.234×106γsi.自发径迹数和诱发径迹数之间的相关系数,为0.979;P(χ2).观测值方差与预测方差之间的概率检验,为55%;t.裂变径迹年龄,29.1±2.0 Ma,L.裂变径迹长度,10.4±2.6 μm.
      下载: 导出CSV
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