ELEVATION DISTRIBUTION PATTERN OF RED CLAY BEDS IN THE REGIONS EAST AND WEST OF LIUPANSHAN AND NEOTECTONIC SIGNIFICANCE
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摘要: 晚新生代红黏土广泛发育于青藏高原东北部陇西高原和鄂尔多斯高原,它不仅是我国北方晚新生代气候和环境变化的载体,而且其高程分布特征也记录了高原地区新构造运动过程。运用遥感技术和数字高程模型(DEM)技术,结合野外调查,分析了六盘山两侧红黏土空间分布特征,并结合已有的红黏土年代学资料及其沉积特征,探讨了青藏高原东北缘的构造隆升,指出红黏土在陇西地区开始沉积以来,六盘山两侧存在多期构造差异性隆升。由于陇西地区隆升速率相对较大,最终使六盘山两侧的构造-地貌格局从原先的东高西低转变为西高东低。Abstract: Late Cenozoic red clay beds which widespread in the northeastern region of Qinghai-Tibet Plateau, not only records late Cenozoic climatic and environmental changes,but also provide indication for Neotectonics of Qinghai-Tibet Plateau. Using Digital Elevation Model technique and together with field observation,the authors analyse elevation distribution pattern of red clay beds on the both sides of Liupanshan, and discuss their neotectonic significance. The result shows that there occurred several phases of differential uplifts on the both sides of Liupanshan since the middle Miocene. The red clay began to deposit in the western region of Liupanshan (the Longxi area), where uplift started earlier than in the Ordos region. Differential uplift occurred across the Liupanshan since the late Miocene and has been enhanced since the late Pliocene, which changed the geomorphic features to be higher in the west than in the east,just the opposite to those in earlier times.
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Key words:
- Liupanshan /
- red clay /
- Digital Elevation Model /
- neotectonic /
- differential uplift
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