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帕隆藏布江中游地壳剥露特征

涂继耀 季建清 钟大赉 周晶

涂继耀, 季建清, 钟大赉, 周晶. 帕隆藏布江中游地壳剥露特征[J]. 地质科技通报, 2022, 41(4): 292-300. doi: 10.19509/j.cnki.dzkq.2021.0260
引用本文: 涂继耀, 季建清, 钟大赉, 周晶. 帕隆藏布江中游地壳剥露特征[J]. 地质科技通报, 2022, 41(4): 292-300. doi: 10.19509/j.cnki.dzkq.2021.0260
Tu Jiyao, Ji Jianqing, Zhong Dalai, Zhou Jing. Crust erosion characteristics in the middle reach of the Purlung Tsangpo River[J]. Bulletin of Geological Science and Technology, 2022, 41(4): 292-300. doi: 10.19509/j.cnki.dzkq.2021.0260
Citation: Tu Jiyao, Ji Jianqing, Zhong Dalai, Zhou Jing. Crust erosion characteristics in the middle reach of the Purlung Tsangpo River[J]. Bulletin of Geological Science and Technology, 2022, 41(4): 292-300. doi: 10.19509/j.cnki.dzkq.2021.0260

帕隆藏布江中游地壳剥露特征

doi: 10.19509/j.cnki.dzkq.2021.0260
基金项目: 

中国地震局地球物理研究所基本科研业务费专项 DQJB20K37

国家自然科学基金项目 41603055

详细信息
    作者简介:

    涂继耀(1988-), 男, 助理研究员, 主要从事构造地质学与同位素年代学研究工作。E-mail: 406962923@qq.com

  • 中图分类号: P542;P597.3

Crust erosion characteristics in the middle reach of the Purlung Tsangpo River

  • 摘要:

    为揭示东喜马拉雅构造结演化过程, 也为未来可能重大工程建设提供基础地质资料, 对帕隆藏布江中游9块基岩样品进行了黑云母40Ar/39Ar测年, 并利用"Pecube"软件对该地区的地壳剥露速率进行半定量计算。样品黑云母40Ar/39Ar年龄范围为103~12.5 Ma, 对应地壳剥露速率范围为0.068~0.50 km/Ma。帕隆藏布江流域地壳剥露速率具有明显的东西差异特征, 下游(西段)地壳剥露速率显著高于中游(东段)。年龄数据及其模拟计算结果表明, 相对于东喜马拉雅构造结内部, 帕隆藏布江中游流域地壳剥露活动较弱且较稳定。雅鲁藏布江对帕隆藏布江的袭夺, 使得帕隆藏布下游(西段)重新进入河流演化幼年阶段, 河流快速下切剥蚀可能是导致该地区地壳剥露速率东西差异的原因。

     

  • 图 1  青藏高原印度板块大地构造框架图(a)以及东喜马拉雅构造结地质简图(b)

    Figure 1.  Generalized tectonic map of Indian Plate and Tibetan Plateau (a), Simplified geologic map of eastern Himalayan syntaxis (b)

    图 2  帕隆藏布江流域数字地貌及采样位置图

    Figure 2.  Digital geomorphological map of Purlung Tsangpo river basin and sample locations

    图 3  各样品黑云母40Ar/39Ar坪年龄图

    Figure 3.  40Ar/39Ar plateau ages of biotite concentrates

    图 4  黑云母40Ar/39Ar年龄高程关系

    Figure 4.  Relationship between biotite 40Ar/39Ar ages and elevations

    图 5  河流地貌形态样品年龄对比图

    a.样品实测年龄、最吻合剥露速率对比图;b.帕隆藏布江河流纵剖面图;c.帕隆藏布江不同位置河流横剖面图

    Figure 5.  River morphology and age contrast

    表  1  样品信息及年龄值

    Table  1.   Sample information and chronology data

    样品名 经度 纬度 海拔/m 岩性 黑云母40Ar/39Ar坪年龄/Ma 2σ误差/Ma MSWD
    11318-01 E96.053° N29.735° 3 067 闪长岩 100.14 0.82 0.32
    11318-02 E96.046° N29.731° 3 090 闪长岩 102.57 0.63 0.38
    11318-03 E95.985° N29.753° 2 962 闪长岩 76.23 0.40 0.91
    11318-04 E95.916° N29.784° 2 896 闪长岩 47.65 0.40 0.17
    11318-05 E95.835° N29.811° 2 820 闪长岩 36.61 0.60 0.61
    11318-06 E95.788° N29.837° 2 752 闪长岩 20.87 0.22 0.16
    11318-07 E95.679° N29.898° 2 716 闪长岩 22.19 0.27 0.82
    11318-10 E95.617° N29.907° 2 680 闪长岩 23.25 0.92 1.03
    11318-11 E95.401° N29.937° 2 558 片麻岩 12.49 0.69 0.19
    下载: 导出CSV

    表  2  各模拟系列信息及计算结果

    Table  2.   Information of several simulation series and calculate results

    模拟系列 经度范围 纬度范围 对应样品编号 模拟起始时间/Ma 最吻合剥露速率/(km·Ma-1) 最吻合计算年龄/Ma 实测年龄/Ma
    1 E96.02°~96.08° N29.6°~29.9° 11318-01, 02 110 0.068 101 100.14,102.57
    2 E95.95°~96.02° N29.6°~29.9° 11318-03 90 0.09 76 76.23
    3 E95.88°~95.95° N29.6°~29.9° 11318-04 60 0.14 48 47.65
    4 E95.81°~95.88° N29.6°~29.9° 11318-05 50 0.18 37 36.61
    5 E95.50°~95.81° N29.7°~30.0° 11318-06, 07, 10 30 0.30 22 20.87,22.19,23.25
    6 E95.30°~95.50° N29.8°~30.1° 11318-11 20 0.50 12 12.49
    下载: 导出CSV
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  • 收稿日期:  2021-05-12
  • 网络出版日期:  2022-09-07

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