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    晚中新世龙门山南段及前缘地区盆山体系形成的动力学机制

    邵崇建 颜照坤 李勇 聂舟 任聪 孙岳

    邵崇建, 颜照坤, 李勇, 聂舟, 任聪, 孙岳, 2023. 晚中新世龙门山南段及前缘地区盆山体系形成的动力学机制. 地球科学, 48(4): 1379-1388. doi: 10.3799/dqkx.2022.279
    引用本文: 邵崇建, 颜照坤, 李勇, 聂舟, 任聪, 孙岳, 2023. 晚中新世龙门山南段及前缘地区盆山体系形成的动力学机制. 地球科学, 48(4): 1379-1388. doi: 10.3799/dqkx.2022.279
    Shao Chongjian, Yan Zhaokun, Li Yong, Nie Zhou, Ren Cong, Sun Yue, 2023. Dynamic Mechanism of Formation of Basin-Mountain System in Southern Segment of Longmenshan and Frontal Area in Late Miocene. Earth Science, 48(4): 1379-1388. doi: 10.3799/dqkx.2022.279
    Citation: Shao Chongjian, Yan Zhaokun, Li Yong, Nie Zhou, Ren Cong, Sun Yue, 2023. Dynamic Mechanism of Formation of Basin-Mountain System in Southern Segment of Longmenshan and Frontal Area in Late Miocene. Earth Science, 48(4): 1379-1388. doi: 10.3799/dqkx.2022.279

    晚中新世龙门山南段及前缘地区盆山体系形成的动力学机制

    doi: 10.3799/dqkx.2022.279
    基金项目: 

    国家自然科学基金项目 41502116

    自然资源部深地动力学重点实验室自主(开放)研究课题 J1901

    中国铀业有限公司-东华理工大学核资源与环境国家重点实验室联合创新基金 2022NRE-LH-04

    东华理工大学江西省数字国土重点实验室开放研究基金资助项目 DLLJ202110

    东华理工大学博士启动基金 DHBK2019044

    详细信息
      作者简介:

      邵崇建(1989—),男,讲师,博士,主要从事构造地貌学和地质灾害研究.ORCID:0000-0002-2228-1515. E-mail:scj350936@163.com

      通讯作者:

      颜照坤,ORCID:0000-0002-0708-1849. E-mail: yzk517@163.com

    • 中图分类号: P541

    Dynamic Mechanism of Formation of Basin-Mountain System in Southern Segment of Longmenshan and Frontal Area in Late Miocene

    • 摘要: 新生代龙门山的隆升机制存在上地壳缩短和下地壳流两种端元模式,两种模式会造成四川盆地不同的构造变形响应,形成不同的盆山系统.为了厘定龙门山南段及前缘地区盆山系统的构造变形特征及其动力学指示意义,利用低温热年代学技术(AFT和AHe)对龙门山南段前缘地区乐地1井7个砂岩样品进行了分析,约束该地区的剥露特征.结果表明,龙门山南段前缘地区中新世(约21 Ma)以来浅部地层经历了约10~11 Ma的快速剥露阶段(约500~700 m/Ma),与前人龙门山南段揭露的快速剥露时间一致.结合区域地质资料,认为约10~11 Ma龙门山南段向南东的逆冲推覆作用,导致构造应力通过四川盆地西南部多层滑脱层向盆地传递,造成龙门山前缘地区大范围构造变形及快速剥露,该认识支持龙门山上地壳缩短的隆升机制.

       

    • 图  1  青藏高原东缘及四川盆地地形地貌图

      Fig.  1.  Topographic map of the eastern margin of the Qinghai-Tibet plateau and the Sichuan basin

      图  2  龙门山南段前缘地区地质剖面图

      剖面位置见图 1;剖面图据李智武等(2009)修改

      Fig.  2.  Geological map of the frontal area of the southern Longmenshan

      图  3  乐地1井样品年龄(AFT和AHe)与样品深度的关系

      a. AFT年龄与样品深度的关系;b. AHe年龄与样品深度的关系

      Fig.  3.  Relationship between sample age (AFT and AHe) and sample depth of Well Ledi 1

      图  4  乐地1井样品年龄(AFT和AHe)与虚拟高程关系

      Fig.  4.  Relationship between sample age (AFT and AHe) and pseudo-elevation of Well Ledi 1

      图  5  龙门山南段及前缘地区的上地壳缩短模式和下地壳流模式

      a.上地壳缩短模式;b.下地壳流模式;图件据Tian et al.(2018a)修改

      Fig.  5.  Upper crustal shortening model and lower crustal flow model in the southern Longmenshan and its front

      表  1  AFT测试结果

      Table  1.   AFT test results

      样品编号 井深(m) 虚拟高程(m) 地层 颗粒数 径迹条数 自发径迹密度
      (105 cm-2)
      238U
      (10-6±1σ)
      Dpar(μm) P2)(%) 合并年龄±
      1σ(Ma)
      中心年龄±
      1σ(Ma)
      平均封闭径迹长度
      (μm±se)和统计条数
      LD01 1 689 3 311 T3x1 25 172 2.203 36.27 ± 33.51 1.65±0.37 0 12.0±1.8 13.1±1.5
      LD02 1 406 3 594 T3x3 39 499 2.718 58.92±75.4 1.55±0.23 72.10 11.7±1.6 12.9±1.1 9.58±0.29(108)
      LD03 1 195 3 805 T3x5 22 143 1.789 32.97 ± 35.76 1.61±0.13 6.00 10.7±2.2 12.3±1.4
      LD04 898 4 102 J2q 30 194 1.572 23.22 ± 28.78 1.67±0.27 7.00 13.1±1.5 15.3±1.5 12.70±0.25(55)
      LD05 622 4 378 J2s1 26 255 2.941 46.69 ± 68.42 1.51±0.27 0 12.1±2.5 14.7±1.9 11.87±0.70(5)
      LD06 329 4 671 J2s2 40 569 2.377 27.37 ± 26.43 1.54±0.22 0 17.1±1.6 18.5±1.3 12.13±0.51(5)
      LD07 61 4 939 J2s2 35 712 3.685 36.66 ± 44.14 1.61±0.29 0 20.9±2.1 21.5±1.8 12.62±0.2(105)
      注:虚拟高程(Pseudo-elevation)指样品在封闭深度之上的距离(e.g., Liu-Zeng et al., 2018).
      下载: 导出CSV

      表  2  AHe测试结果简表

      Table  2.   Brief table of AHe test results

      样品编号 井深(m) 虚拟高程(m) a平均FT U
      (10-6)
      Th
      (10-6)
      Sm
      (10-6)
      Th/U b[eU]
      (10-6)
      校正年龄±1σ (Ma) 颗粒长度
      (μm)
      颗粒半宽度(μm)
      LD-01 1 689 311 0.71 12.5 91.5 71.4 7.34 34.0 1.1±0.1 147.6 53.4
      LD-01 1 689 311 0.72 5.3 87.6 259.3 16.40 25.9 1.2±0.1 128.8 57.7
      LD-03 1 195 805 0.70 13.7 45.5 256.9 3.32 24.4 3.8±0.2 125.4 52.9
      LD-03 1 195 805 0.72 21.1 53.5 260.0 2.54 33.7 15.7±1.0 207.1 50.1
      LD-03 1 195 805 0.76 6.3 46.1 139.8 7.32 17.1 4.7±0.3 160.3 62.7
      LD-04 898 1 102 0.81 22.1 25.2 181.1 1.14 28.0 7.9±0.5 285.1 70.5
      LD-04 898 1 102 0.73 2.6 19.2 54.0 7.26 7.1 6.1±0.4 239.9 49.6
      LD-04 898 1 102 0.72 4.8 14.7 106.3 3.03 8.3 5.2±0.3 179.2 49.5
      LD-07 61 1 939 0.78 4.7 27.6 83.4 5.94 11.2 6.7±0.4 219.0 64.6
      LD-07 61 1 939 0.74 3.7 13.3 33.1 3.59 6.8 9.6±0.6 205.1 52.9
      LD-07 61 1 939 0.75 8.6 41.6 111.1 4.85 18.4 11.1±0.7 186.0 55.1
      注:aFT为α离子射出效应校正;b有效的铀浓度(U×10-6+0.235 Th×10-6);虚拟高程(Pseudo-elevation)指样品在封闭深度之上的距离(Liu-Zeng et al., 2018).
      下载: 导出CSV
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    • 收稿日期:  2022-05-31
    • 刊出日期:  2023-04-25

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