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    滇中地块新生代晚期的变形机制:基于构造地貌学分析

    王丹 董有浦 焦骞骞 张东越 段佳鑫 余华玉

    王丹, 董有浦, 焦骞骞, 张东越, 段佳鑫, 余华玉, 2022. 滇中地块新生代晚期的变形机制:基于构造地貌学分析. 地球科学, 47(8): 3016-3028. doi: 10.3799/dqkx.2021.146
    引用本文: 王丹, 董有浦, 焦骞骞, 张东越, 段佳鑫, 余华玉, 2022. 滇中地块新生代晚期的变形机制:基于构造地貌学分析. 地球科学, 47(8): 3016-3028. doi: 10.3799/dqkx.2021.146
    Wang Dan, Dong Youpu, Jiao Qianqian, Zhang Dongyue, Duan Jiaxin, Yu Huayu, 2022. The Mechanism of Tectonic Deformation of the Central Yunnan Terrane in the Late Cenozoic Based on Tectonic Geomorphology. Earth Science, 47(8): 3016-3028. doi: 10.3799/dqkx.2021.146
    Citation: Wang Dan, Dong Youpu, Jiao Qianqian, Zhang Dongyue, Duan Jiaxin, Yu Huayu, 2022. The Mechanism of Tectonic Deformation of the Central Yunnan Terrane in the Late Cenozoic Based on Tectonic Geomorphology. Earth Science, 47(8): 3016-3028. doi: 10.3799/dqkx.2021.146

    滇中地块新生代晚期的变形机制:基于构造地貌学分析

    doi: 10.3799/dqkx.2021.146
    基金项目: 

    国家自然科学基金项目 41802215

    国家自然科学基金项目 41762017

    国家自然科学基金项目 41672206

    详细信息
      作者简介:

      王丹(1993-),女,硕士研究生,从事构造地质学等相关领域的研究. ORICD:0000-0001-6587-847X. E-mail:1239029173@qq.com

      通讯作者:

      董有浦, ORICD:0000-0002-2829-7585. E-mail: dongypsd@126.com

    • 中图分类号: P546

    The Mechanism of Tectonic Deformation of the Central Yunnan Terrane in the Late Cenozoic Based on Tectonic Geomorphology

    • 摘要: 滇中地块位于青藏高原东南缘,是研究青藏高原东南缘新生代晚期构造变形机制的理想场所. 滇中地块新生代晚期的变形机制主要有“下地壳流”和“刚性块体挤出”两种模式,前者认为地块构造活动分布较为均匀,后者认为构造活动沿断裂带更为强烈. 由于地貌指数对构造活动非常敏感,为厘定研究区新生代晚期的变形机制,基于30 m分辨率的SRTM⁃3数字高程模型(DEM)提取了滇中地区319个(亚)流域盆地,通过分析获得了面积高程积分曲线及面积高程积分(HI)、流域形状指数(BS)、流域盆地不对称度(AF)、标准化河流阶梯指数(SLK)、谷底宽度与谷间高度比(VF)这5种地貌指数,综合这五种指数得出相对活动构造指数(Iat),并利用构造地貌指数(Iat)揭示了研究区的相对构造活动分布特征. 研究表明丽江-小金河断裂带、则木河-小江断裂带、红河断裂带及金沙江两侧的Iat值相对较小,其他部位相对较高,这表明滇中地区的构造活动性强的区域主要集中发育在断裂带附近,与“刚性块体挤出”模式相一致. 滇中地块中部的金沙江两侧Iat值相对较低,表明其地貌活动性较强. 这是由于新生代晚期青藏高原东南缘的隆升及河流重组,导致的金沙江及其支流切割力增强,从而造成金沙江两侧HI值、BS值、SLK值增高和VF值降低,使得金沙江两侧Iat值相对较低.

       

    • 图  1  滇中地区活动构造简图

      a. 青藏高原东缘构造图;b. 研究区

      Fig.  1.  The structural sketch map of the Central Yunnan terrane and surrounding area

      图  2  滇中地区提取的亚流域盆地

      Fig.  2.  Shaded relief map with the drainage basins extracted for the Central Yunnan terrane

      图  3  面积高程积分曲线

      a. 流域142、161、239、246和273呈上凸型;b. 流域48、94、216、261和302呈S型;c. 流域38、114、130、186和256呈下凹型

      Fig.  3.  Area integral curve

      图  4  相对活动构造分类(Iat)与滇中地体年降水的比较

      Fig.  4.  Comparison of the relative active tectonics classes (Iat) to annual precipitation in the Central Yunnan terrane

      图  5  年降水量与相对构造活动性等级(Iat)的双变量线性回归

      Fig.  5.  Bi⁃variant linear regression of the relative tectonic activity classes(Iat)⁃annual precipitation

      图  6  小流域的裂点位置及岩性分布

      a. 流域35;b. 流域268

      Fig.  6.  Knickpoints location and lithologic distribution of basins

      图  7  流域139,147,168的河道纵剖面

      Fig.  7.  Channel longitudinal profile analysis

      表  1  构造活动性分析中的地貌指数

      Table  1.   Summary and explanation of morphometric parameters used in tectonic landform analysis

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