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首页> 外文期刊>Journal of Asian earth sciences >Bedrock channels response to differential rock uplift in eastern Qilian Mountain along the northeastern margin of the Tibetan Plateau
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Bedrock channels response to differential rock uplift in eastern Qilian Mountain along the northeastern margin of the Tibetan Plateau

机译：青藏高原东北缘祁连山东部基岩通道对差异岩体抬升的响应

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摘要

The response of bedrock channels to differential rock uplift in eastern Qilian Mountain significantly dictates the topographic evolution of the northeastern margin of the Tibetan Plateau. Our ability to extract tectonic information directly from channel profiles mainly depends on the calibration of incision processes laws. Here we assess the degree and nature of channels response to differential rock uplift in eastern Qilian Mountain base on an empirical calibration of the shear-stress incision model utilizing field survey data (lithologic resistance, sediment flux, discharge and channel width). Parameters calibration indicates that channels developed in the high mountain zone (HMZ) show an approximate 1.1-1.3 times increase in erosion coefficient K than in the low mountain zone (LMZ), mainly attributing to the adjustments of channel width and discharge. Moreover, profiles analysis reveals a systematic geographic distribution of steepness indices and concavity in this area. The regions of high and low steepness indices are spatially associated with the higher (high rock uplift rates) and lower (low rock uplift rates) parts of landscape, respectively, suggesting that the spatial distribution pattern of channel steepness mainly reflects the differential rock uplift. Channels with abnormal high concavity values apparently associate with the major thrust faults, suggesting that the differential rock uplift is controlled by the thrusting of major active faults. Combining parameters calibration with profile analysis between the two zones, the possible increase in rock uplift rates is 2-4 times in the HMZ than in the LMZ indeed. (C) 2015 Elsevier Ltd. All rights reserved.
机译：祁连山东部基岩通道对差异岩石抬升的响应显着决定了青藏高原东北缘的地形演变。我们直接从通道剖面中提取构造信息的能力主要取决于切口过程定律的校准。在此，我们根据野外调查数据（岩性，沉积物通量，流量和河道宽度）的切应力模型的经验标定，评估了祁连山东部差异岩体抬升河道响应的程度和性质。参数校准表明，在高山区（HMZ）开发的河道的侵蚀系数K比低山区（LMZ）高出大约1.1-1.3倍，主要归因于河道宽度和流量的调整。此外，剖面分析揭示了该地区陡度指数和凹度的系统地理分布。高和低陡度指数的区域在空间上分别与景观的较高（高岩石隆起率）和较低（低岩石隆起率）部分相关，这表明河道陡度的空间分布格局主要反映了差异性岩石隆起。具有高高凹度值的河道显然与主要的逆冲断层有关，这表明微分的岩石隆起受主要活动断层的逆冲作用控制。将参数校准与两个区域之间的剖面分析相结合，HMZ的岩石上升速率可能比LMZ高出2-4倍。 （C）2015 Elsevier Ltd.保留所有权利。

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  • 来源
    《Journal of Asian earth sciences》 |2015年第15期|1-19|共19页
  • 作者

    Pan Baotian; Li Qiong; Hu Xiaofei; Geng Haopeng; Gao Hongshan;

  • 作者单位

    Lanzhou Univ, Key Lab Western Chinas Environm Syst, Minist Educ, Lanzhou 730000, Peoples R China;

    Lanzhou Univ, Key Lab Western Chinas Environm Syst, Minist Educ, Lanzhou 730000, Peoples R China;

    Lanzhou Univ, Key Lab Western Chinas Environm Syst, Minist Educ, Lanzhou 730000, Peoples R China;

    Lanzhou Univ, Key Lab Western Chinas Environm Syst, Minist Educ, Lanzhou 730000, Peoples R China;

    Lanzhou Univ, Key Lab Western Chinas Environm Syst, Minist Educ, Lanzhou 730000, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Bedrock channels; Neotectonics; Fluvial geomorphology; Qilian Mountain;

    机译：基岩河道;新构造学;河床地貌;祁连山;

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