| 陕西靖边龙洲波浪式丹霞地貌成因机理初探 |
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| 关键词:Jingbian, Shaanxi wavy Danxia landform genetic mechanism |
| 基金项目:陕西省公益性地勘专项项目“陕北丹霞地貌地质遗迹详细调查项目(编号: 20180201)” |
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| A Preliminary Study on the Genetic Mechanism of Wavy Danxia Landform in Longzhou, Jingbian, Shaanxi Province |
| Recently, based on the detailed investigation of Danxia landform in Longzhou, the authors found that the type of Danxia Landform in this area is the transitional type of positive-negative landform—wavy Danxia landform. In order to evaluate its value and significance scientifically, the authors mainly discussed the genetic mechanism of the wavy Danxia landform in Longzhou in the aspects of rock characteristics, geological structure characteristics and external dynamic factors. Some phenomena have been found: First, parallel bedding and large-scale wind-staggered bedding of sandstone of Luohe Formation in the study area have a good shaping effect on the formation of wavy Danxia landscape; The purple-red sandstone of Luohe Formation is a set of aeolian desert facies deposits, rocks with poor cementation, low hardness and fragility, which constitutes the material basis for the formation of wavy Danxia landform; Since the late Cretaceous, the Ordos Basin has been tilted and the crust in the area has been generally uplifted, which shows that the Longzhou area in Jingbian has developed multi-level palaeoplanation planes and river terraces, which play a basic role in controlling the formation of wavy Danxia landform; There are many sets of joints and fissures in the sandstones of the Luohe Formation in this area, and the sandstones of the Luohe Formation are cut into blocks, which play a key role in controlling the formation and transformation of the wavy Danxia landform; In terms of the external dynamic factors, Jingbian has a semi-arid inland monsoon climate, obviously transformed by the northwest wind，which is the main external dynamic factor for the formation of wavy Danxia landform. In addition, the rainstorm in summer and autumn which has strongly eroded the surface strata, the cold wave and frost in spring and autumn, and the freezing, melting and collapsing of the rocks have also played an important role in the formation of Longzhou wavy Danxia landform. In addition to the constraints of geological structure and water erosion, the transformation of micro landform by wind is very obvious, which is the main external dynamic factor and feature of the formation of Danxia landform in Longzhou, Jingbian. The development stage of wavy Danxia landform in this area can be divided into two stages. |
| PENG Xiao-hua,WU Hao,LI Yi-zhao,ZHANG Yu,ZHU Jie,DANG Chen.2020.A Preliminary Study on the Genetic Mechanism of Wavy Danxia Landform in Longzhou, Jingbian, Shaanxi Province[J].Acta Geoscientica Sinica,41(3):443-451. |
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