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    祁连山东南缘第四纪以来的隆升作用及动力学分析

    樊光明 张智勇 顾延生 张海峰 冯光胜

    樊光明, 张智勇, 顾延生, 张海峰, 冯光胜, 2003. 祁连山东南缘第四纪以来的隆升作用及动力学分析. 地球科学, 28(4): 389-394.
    引用本文: 樊光明, 张智勇, 顾延生, 张海峰, 冯光胜, 2003. 祁连山东南缘第四纪以来的隆升作用及动力学分析. 地球科学, 28(4): 389-394.
    FAN Guang-ming, ZHANG Zhi-yong, GU Yan-sheng, ZHANG Hai-feng, FENG Guang-sheng, 2003. Uplifting since Quaternary in Southeastern Qilian Mountains and Its Dynamic Analysis. Earth Science, 28(4): 389-394.
    Citation: FAN Guang-ming, ZHANG Zhi-yong, GU Yan-sheng, ZHANG Hai-feng, FENG Guang-sheng, 2003. Uplifting since Quaternary in Southeastern Qilian Mountains and Its Dynamic Analysis. Earth Science, 28(4): 389-394.

    祁连山东南缘第四纪以来的隆升作用及动力学分析

    基金项目: 

    中国地质调查局“民和县幅1∶2 5万数字地质填图项目” 200213000016

    “数字填图过程、多元数据整合及成果表达方式研究” 基[2003]009-02

    详细信息
      作者简介:

      樊光明(1952-), 男, 教授, 长期从事构造地质学的教学和科研工作

    • 中图分类号: P54

    Uplifting since Quaternary in Southeastern Qilian Mountains and Its Dynamic Analysis

    • 摘要: 祁连山东南缘隆升是来自印度板块挤压的远程效应与该区周边地块的存在及其活动的相互制约作用而产生的挤压隆升、伸展隆升和左旋走滑隆升共同作用的结果.标志性构造及主应力分析表明, 自早更新世以来, 隆升动力机制不断发生转换, 在早更新世早期以北东-南西向挤压为主, 中更新世早期至全新世早期以北东-南西向拉张、近东-西向的拉张为主, 全新世晚期以北西-南东向左旋扭动为主.根据湟水河阶地有关数据估算出的不同时段河谷下切速率为: 1.4 1× 103 ~ 36.4ka间平均速率较慢(0.11mm/a), 36.4ka至今较快(1.5 4mm/a), 其中10.5~ 3ka间最快(2.2 7~ 2.80mm/a), 显示该区自1.4 1Ma至今构造隆升具有越来越强烈的变化趋势.

       

    • 图  1  青藏高原东北缘应力体系分析

      1.断裂; 2.隐伏断裂; 3.平移断裂; 4.应力作用方向

      Fig.  1.  Stress system analysis of northeastern Tibet plateau

      图  2  祁连山东南缘民河地区主要断裂及第四系地质简图(左上角为研究区位置及主要水系分布)

      1.全新统冲积物; 2.全新统冲洪积物; 3.上更新统洪积物; 4.上更新统冲积物; 5.上更新统风积物; 6.上更新统冲洪物; 7.中更新统洪积物; 8.中更新统冲积物; 9.新近系—古近系红层; 10.前新生代基底; 11.构造单元主断裂; 12.逆断层13.正断层; 14.平移断层; 15.隐伏断层; 16.角度不整合界线; 17.主要水系及其流向

      Fig.  2.  Simple geological map of major faults and Quaternary strata in Minhe area, southeastern Qilian Mountains

      图  3  1.41 Ma以来不同时段的下切速率

      Fig.  3.  Downcutting rate of stream valley in different time zones since 1.41 Ma

      表  1  红古城地区湟水河阶地特征及下切速率

      Table  1.   Terrace characteristics and trenching rates in Huangshui River

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    • 收稿日期:  2003-04-18
    • 刊出日期:  2003-07-25

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