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    东昆仑东段第四纪成山作用过程与地貌变迁

    王国灿 吴燕玲 向树元 贾春兴

    王国灿, 吴燕玲, 向树元, 贾春兴, 2003. 东昆仑东段第四纪成山作用过程与地貌变迁. 地球科学, 28(6): 583-592.
    引用本文: 王国灿, 吴燕玲, 向树元, 贾春兴, 2003. 东昆仑东段第四纪成山作用过程与地貌变迁. 地球科学, 28(6): 583-592.
    WANG Guo-can, WU Yan-ling, XIANG Shu-yuan, JIA Chun-xing, 2003. Mountain Building Process and Geomorphic Migration of Eastern Kunlun Mountains during Quaternary. Earth Science, 28(6): 583-592.
    Citation: WANG Guo-can, WU Yan-ling, XIANG Shu-yuan, JIA Chun-xing, 2003. Mountain Building Process and Geomorphic Migration of Eastern Kunlun Mountains during Quaternary. Earth Science, 28(6): 583-592.

    东昆仑东段第四纪成山作用过程与地貌变迁

    基金项目: 

    国家自然科学基金项目 40072062

    中国地质调查局项目"1∶25万阿拉克湖幅区域地质调查" 19991300004021

    详细信息
      作者简介:

      王国灿(1963 -), 男, 教授, 1997年在中国地质大学(武汉) 获博士学位, 长期从事构造学的教学与研究工作, 近年主要科研方向为造山带地质和构造年代学. E-mail: wgcan@cug.edu.cn

    • 中图分类号: P534.63

    Mountain Building Process and Geomorphic Migration of Eastern Kunlun Mountains during Quaternary

    • 摘要: 东昆仑山的现代地貌格局为一系列北西西向的山系和盆地(谷地) 相间列, 第四纪沉积和岩相分布与地貌格局存在良好的匹配性, 第四纪不同时代沉积反映了山系的成山作用过程.显著地貌分异首先出现于北部的布尔汗布达山, 即早更新世中晚期(1525ka), 表现为受布尔汗布达山地貌控制的其南部山脚的早更新世中期(1525ka) 左右冲洪积物的始现.南部马尔争—布青山的成型发生于早中更新世之交, 这次成山作用在整个青藏高原昆仑—黄河源地区具有广泛影响.更南部的查哈西里山在1113.9~979.6ka间的沉积特征也显示了这一事件的影响, 即由湖相转变为冲洪积相, 但在这一时期查哈西里山总体仍为沉积区, 山系并未形成, 山顶最高层位粗冲洪积物的砾石成分统计和砾石扁平面产状统计仍显示物源来自北部, 沉积与北部隆起的马尔争-布青山有关, 查哈西里山真正隆起高于两侧, 应发生在晚更新世.伸展断裂组合与地貌之间的良好耦合关系表明, 东昆仑地区山体的崛起与伸展断裂构造之间存在密切的成因关系.山系突出于高原面的成山作用主要受控于近南北向的伸展作用, 这一伸展作用应与青藏高原整体隆升后边缘的重力失稳垮塌及均衡作用相联系, 这种伸展垮塌随着时间的迁移向南发展.

       

    • 图  1  东昆仑阿拉克湖一带第四纪地质简图

      1.全新世湖沼沉积: 灰色淤泥质粉细砂、亚砂土及含钙质粘土; 2.全新世湖泊沉积: 砂砾石、粉砂及次生黄土; 3.全新世沼泽沉积: 灰色淤泥质粉细砂、亚砂土及含钙质粘土; 4.晚更新世-全新世洪冲积: 灰色、杂色粘土、砂砾石; 5.中更新世冰碛: 杂色泥砂质砾石及漂砾; 6.中更新世冰水沉积: 杂色泥砂质砾石; 7.中更新世冰碛: 杂色泥砂质砾石及漂砾; 8.中更新世冲洪积: 灰黄色、杂色砂砾石; 9.早更新世洪冲积: 灰色、杂色砂砾石; 10.早更新世河湖积: 弱胶结杂色砂砾岩夹粉砂岩透镜体; 11.早更新世湖积: 浅灰色粉砂质粘土、灰黄色粉砂夹砂砾石; 12.前第四纪基岩区; 13.冰斗; 14.冰川U形谷; 15.水系; 16.平坦夷平面; 17.水系系统界线; 18.主要山脊线、分水岭; 19.东昆南活动断裂

      Fig.  1.  Distribution of Quaternary strata and relief framework in Alake Lake area of the eastern Kunlun, Qinghai Province

      图  2  测区不同部位第四系综合地层柱及砾石成分统计

      Fig.  2.  Quaternary stratigraphic columns in different parts and gravel composition

      图  3  查哈西里山顶晚更新统顶部冲洪积物的砾石扁平面产状极点图

      (下半球投影)

      Fig.  3.  Pole diagram of the oblate pebbles of the Late Pleistocene proluvium and alluvium deposit on the top of Chahaxili

      图  4  东昆仑地区现代地貌与更新世伸展断裂系统关系

      Fig.  4.  Relationship between the modern relief and Pleistocene extension normal faults in the eastern Kunlun Mountains

      表  1  研究区不同部位主要第四纪沉积年龄测试结果

      Table  1.   Ages of the Quaternary strata in study area

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    • 收稿日期:  2003-05-15
    • 刊出日期:  2003-11-25

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