Discussion on Differential Structural Deformation and Its Dynamic Genesis in Eryuan County,Yunnan Province
Eryuan County,Yunnan Province is tectonically located on the southeastern edge of the Qinghai-Tibet Plateau,with multiple regional main faults,complex structural features,and multiple stages of tectonic evolution.In order to intensively analyze the properties and spatial distribution characteristics of faults and folds in Eryuan County,this article explores the spatial distribution patterns of tectonic deformation in the county through field geological surveys and ArcGIS software.The research results indicate that:(1)Multiple regional faults in Eryuan County have characteristics of multi-phase,multi-directional,and multipolar,and the formation and evolution of folds are closely related to the evolution of the main faults.(2)Eryuan County has the characteristics of east-west zonation and north-south segmentation.Zonation refers to the zoning characteristics exhibited on the surface by the extension of multiple faults from west to east in a northwest trend,while segmentation reflects the distribution patterns exhibited on the plane after the dislocation and transformation of former structures by multiple later faults in a northeast direction since the Cenozoic.(3)The formation of the above differential tectonic deformation characteristics is due to the change of regional stress field in Miocene,and the stress field has changed from left-lateral compressive torsional tectonic stress before Miocene to right-lateral tensile torsional tectonic stress.
万方数据
维普
