摘要
通过野外地质调查,结合地球物理探测手段,研究两郧断裂郧县盆地段地质与地球物理特征;参照两郧断裂带多个位置采集断层物质的SEM、TL测试成果,并结合本次对断层上断点沉积物OSL测年数据,对两郧断裂该段第四纪活动性进行分析。研究结果表明,两郧断裂在郧县盆地段埋深相对较深;断裂特征主要为逆断层,部分分支断裂显示为正断性质;断裂带最新活动时代为中更新世晚期-晚更新世早期。
The geological and geophysical characteristics of the Yunxian basin segment of Yunyang-Yunxi faults are studied through geological survey and geophysical exploration.According to multiple position acquisition of Yunyang-Yunxi faults,material fracture SEM,TL test results,and combined with the data of the upper fault point sediment OSL,the Quaternary activity of the segment is analyzed.The results show that the Yunyang-Yunxi faults in the Yunxian basin section are relatively deep,the fracture characteristics are mainly reverse faults,and some branch faults show positive fault characteristics.The latest active age of the fault zone is the late Middle Pleistocene to the early Late Pleistocene.