Research On Neotectonic Movement Characteristics With DEM Technique In Alxa Area,Inner Mongolian Autonomous Region

This paper base on1:250,000Geological Mapping for Alxa,Inner Mongolia,extracting physiognomy morphology indicators in research area by usingSRTM-DEM (Digital Elevation Model) and ArcGIS spatial analysis as theinstructional methods. After which, author made some analysis for the extraction byusing the appropriate statistical methods,and picked out the planation surface in thisarea, at last we analyze the neotectonic movement by the planation surface selectedbefore. This paper mainly extracted height, slope, aspect and topography fluctuationdegrees, through the analysis, the slope in this area has a positive correlation with theheight, in a high-altitude area, slope is increasing too. Through the topographyfluctuation degree analysis, Researching area is mainly in mid-elevation plains andmid-elevation platform landform.In order to judgment the planation surface in research area, author extractedslope and height then made some statistical analysis. Results show that: this statisticalmethod is applies to judging the planation surface. However, there still someproblems needs to be solved.Through investigating the characteristic of the planation surface, previousgeological data and regional tectonic features, author concluded that the neotectonicmovement feature is flaw movement in a large area tilt and uplift backgroundenvironment. and at the same time, the new tectonic movement control the rising anddisintegration of the planation surface. Finally, forming a basic physiognomymorphology pattern of alternating with fault-block mountain and fault subsidencebasin under the action of pitting and accumulating...