缅甸其培水电站恩梅开江断裂构造特征及活动性评价

Tectonic characteristics and activity of Nami Hka River Fault at Chipwi hydropower station in Burma

综合野外地质调查、氡气测量、石英形貌扫描(SEM)等资料,认为恩梅开江断裂中-晚元古代为一条韧性剪切带,但在喜马拉雅期发生了脆性变形,表现为一条由多条脆性断层叠加于韧性剪切带的断裂带。断裂新构造活动期主要集中在上新世到更新世。全新世以来活动性较弱,对水电站工程建设影响微弱。

Based on the analysis of geologic field work,Radon measurement,scanning of quartz shape（SEM）,Nami Hka River Fault is a ductile shear zone in mid-late Proterozoic,but shows brittle deformation in Himalayan.The fault is composed of brittle faults superimposed on ductile shear belt.The neotectonic movement active phase of the fault focused on the Pliocene and Pleistocene.The fault has little influence to the hydropower engineering construction because of the weak activity since the Holocene.