The Late Cenozoic crustal shortening in the north‐east margin of the Qilian Shan: Evidence from the Fengle Basin, Gansu Province,Geological Journal

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The Late Cenozoic crustal shortening in the north‐east margin of the Qilian Shan: Evidence from the Fengle Basin, Gansu Province
Geological Journal ( IF 1.4 ) Pub Date : 2020-09-02 , DOI: 10.1002/gj.3975
Zixian Zhao _{1,

2} , Wei Shi _{1,

2} , Yong Yang _{1,

2} , Yuanfang Zhao _{1,

2} , Tianyu Wang _{1,

2} , Qian Yang _{1,

2,

3}

Affiliation

The north‐east margin of the Qilian Shan forms the front of the northeastward expansion of the Tibetan Plateau. Its Cenozoic crustal shortening is significant for understanding the uplift and growth of the Tibetan Plateau. The Fengle Basin, in the north‐east margin of the Qilian Shan, is characteristic of the typical regional superimposed deformation in Cenozoic strata, documenting the Cenozoic tectonic evolution process in the north‐east margin of the Tibetan Plateau. In this study, we conducted large‐scale geological mapping and regional structural analysis in the Fengle Basin, and rebuilt the two phases of Late Cenozoic crustal shortening deformation in this area: (a) The NW–SE shortening deformation in the Middle–Late Miocene led to the formation of NE‐striking folds in the Fengle Basin, and a hiatus between the Lower and Upper formations of the Gansu Group, probably linked with the far‐field effect of the northwestward subduction of the Pacific Plate. (b) The NE–SW shortening in the Late Miocene–Early Pleistocene overprinted the early NE‐striking folds, resulting in the development of a large‐scale dome structure in this area. The NE–SW shortening is associated mainly with the northeastward growth of the Tibetan Plateau. This study provides crucial evidence for the reconstruction of the intracontinental deformation process in the northeastern periphery of the Tibetan Plateau.

中文翻译：

祁连山东北缘晚新生代地壳缩短：来自甘肃丰乐盆地的证据

祁连山的东北边缘形成青藏高原向东北扩展的前缘。它的新生代地壳缩短对于了解青藏高原的隆升和增长具有重要意义。祁连山东北边缘的丰乐盆地是新生代地层典型区域叠加变形的特征，记录了青藏高原东北边缘新生代构造演化过程。在这项研究中，我们在丰乐盆地进行了大规模的地质测绘和区域结构分析，并重建了该地区晚新生代地壳缩短变形的两个阶段：（a）中晚中新世的西北-东南缩短缩短变形导致在丰乐盆地形成NE走向褶皱，甘肃群上下两层之间的裂隙，可能与太平洋板块西北俯冲的远场效应有关。（b）中新世晚期至早更新世的NE-SW缩短，覆盖了NE早期的褶皱，导致该地区形成了大规模的穹顶结构。NE-SW缩短主要与青藏高原的东北增长有关。该研究为青藏高原东北缘大陆内部变形过程的重建提供了重要的证据。导致在该地区开发了大型圆顶结构。NE-SW缩短主要与青藏高原的东北增长有关。该研究为青藏高原东北缘大陆内部变形过程的重建提供了重要的证据。导致在该地区开发了大型圆顶结构。NE-SW缩短主要与青藏高原的东北增长有关。该研究为青藏高原东北缘大陆内部变形过程的重建提供了重要的证据。

更新日期：2020-11-03

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