ESR Chronological Evidence of Neotectonic Movement in Eryuan County,Yunnan Province
Eryuan County,in Yunnan Province,has complex structural characteristics and intense Neotectonic movement.In order to detailed analyze the basic characteristics of the Neotectonic movement in this area,the Electron Spin Resonance(ESR)dating of rock samples in the field was carried out in this study.The results show that the age of the samples is 62～1007ka,which belongs to the Neotectonic period.The age of ESR decreased gradually from west to east,indicating that the critical period of Eryuan tectonic movement gradually became late from west to east since Pleistocene.Combined with the altitude of the samples and the age of ESR,it is considered that the present high altitude area has a higher uplift rate than the earlier tectonic uplift time and longer duration.The present-day basin-mountain contact zone at lower elevations shows strong Neotectonic movement,has a small ESR age,several small(associated)faults in clastic rocks,and is prone to natural earthquakes.
electron spin resonanceNeotectonic movementfaultEryuan County
万方数据
维普
