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地质科学  2018, Vol. 53 Issue (3): 819-834    DOI: 10.12017/dzkx.2018.046
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西秦岭嘉陵江上游瞬时地貌发育特征
史小辉1        1,2    董云鹏1,2    王师迪1        1
  1. 大陆动力学国家重点实验室,西北大学地质学系  西安    710069
  2. 大陆构造协同创新中心,西北大学  西安    710069
Transient geomorphic characteristics of the upper Jialing River Basin, West Qinling,northeastern Tibetan Plateau
Shi Xiaohui1    Yang Zhao1, 2    Dong Yunpeng1, 2    Wang Shidi1    Zhou Bo1
  1. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069;
  2. Collaborative Innovation Center of Continental Tectonics, Northwest University, Xi’an 710069
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摘要 

西秦岭位于青藏高原东北缘,是青藏高原晚新生代构造扩展的前缘部位。西秦岭地区发育的一系列河流水系作为高原物质向外扩展的载体,记录了高原扩展过程中的地貌演化信息。本文选取西秦岭嘉陵江上游的支流作为研究对象,以河流纵剖面的形态和陡峭指数的空间分布为基础数据,初步分析了嘉陵江上游的地貌特征及其影响因素。结果表明,嘉陵江上游地貌演化处于瞬时状态,裂点以上的低陡峭指数区域代表了残余地貌,裂点以下高陡峭指数区域是裂点响应基准面下降后形成的新地貌。通过对比区域岩性和降水条件发现,岩性和降水对河流裂点发育以及陡峭指数的影响是有限的,河流裂点的发育和陡峭指数的变化主要受控于区域构造抬升引起的基准面下降。陡峭指数的空间分布特征表明构造作用对地貌发育起了重要的塑造作用。西秦岭瞬时地貌的发育是对印度板块与欧亚板块碰撞汇聚以来的远程效应的响应。

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史小辉 杨 钊 董云鹏 王师迪 周 波
关键词嘉陵江上游   河流纵剖面   陡峭指数   地貌过程   青藏高原东北缘     
Abstract

The West Qinling is located at the northeastern Tibetan Plateau, it is the front part of the outward growth of the Tibetan Plateau during the Late Cenozoic. And the fluvial systems developed along the West Qinling, which was resulted from the northeastward expansion of the Tibetan Plateau, had recorded the evolutionary information of landscape during the outward expansion of the Tibetan Plateau. In this paper, the longitudinal profiles of the upper Jialing River Basin and the spatial patterns of normalized channel steepness were analyzed. Based on the geomorphic parameters, we have discussed the general landscape characters of the upper Jialing River Basin and its influence factors. The results indicated that the landscape evolution of the upper Jialing river basin is in a transient state. The upstream basin of knickpoints represent the relict landscapes and downstream basin of knickpoints is the new landscape which is in the process of adjusting to the base-level fall. Local comparisons of the knickpoint development and channel steepness revealed that the lithology and precipitation have limited influence on the knickpoint development and spatial patterns of channel steepness. The knickpoint development and the variations of channel steepness were controlled by the base-level fall which was caused by the tectonic uplift. The spatial patterns of normalized channel steepness revealed that the tectonic force plays a significant role in shaping the landscape. The development of the transient geomorphic in the West Qinling is a response to the remote effects since the Indian plate and Eurasian plate collision.

Key wordsUpper Jialing River Basin   Longitudinal profiles   Steepness index   Landscape evolution   Northeastern Tibetan Plateau   
收稿日期: 2017-10-20;
基金资助:

国家自然科学基金项目(编号:41672199,41302164,41421002)和陕西省教育厅专项科研计划项目(编号:15JK1754)资助。

通讯作者: 杨 钊,男,1982年5月生,博士,讲师,构造地质学专业。     E-mail: yangzh@nwu.edu.cn
作者简介: 史小辉,男,1987年10月生,博士研究生,构造地质学专业。E-mail:shixhok@163.com
引用本文:   
史小辉 杨 钊 董云鹏 王师迪 周 波. 2018, 西秦岭嘉陵江上游瞬时地貌发育特征. 地质科学, 53(3): 819-834.
Shi Xiaohui Yang Zhao Dong Yunpeng Wang Shidi Zhou Bo. Transient geomorphic characteristics of the upper Jialing River Basin, West Qinling,northeastern Tibetan Plateau[J]. Chinese Journal of Geology, 2018, 53(3): 819-834.
 
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[2] 陈天仕 程 斌 董云鹏 王兆国. 南北构造带北段S波分裂研究及其动力学意义[J]. 地质科学, 2018, 53(3): 860-875.
[3] 郭进京 吉夏 赵海涛 陆宏宇 王凯旋 韩文峰. 西秦岭北缘漳县韩家沟砾岩对青藏高原东北缘地壳隆升的约束[J]. 地质科学, 2017, 52(4): 1011-1025.
[4] 张洪双, 李秋生, 高锐, 叶卓, 龚辰. 青藏高原东北缘岩石圈-软流圈边界成像[J]. 地质科学, 2016, 51(1): 5-14.
 
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