Application of multi-source geological data in the division into tectonic units of the orogenic belt and tectonic evolution in digital geological survey——A case study of the Minhe area,Qinghai,China

Multi-source geological data include remote sensing,geochemical and geophysical data.The paper introduces the method of distinguishing tectonic units in orogenic belts using the multi-source geological data.Remote sensing data are widely used in determining regional tectonic boundaries and active faults and remote sensing images have very notable effects in explaining liner structure,i.e.faults.We can distinguish different geologic bodies,liner structures and active faults according to the image difference among different tectonic units,and furthermore,we can more visually explain linear structure by using remote sensing data superposed by DEM.Geochemical data has some significance in determining large tectonic boundaries.According to the geochemical characteristics of stream sediments,we can use the factor analysis to determine large tectonic boundaries.Geophysical data offer the information of deep extensions of geologic bodies and tectonic boundaries,and can provide evidence for the study of the kinematic and dynamic characteristics of faults.