摘要
通过野外地质调查和光释光测年,分析了两郧断裂郧阳盆地段的几何结构和第四纪活动性。研究表明,两郧断裂几何结构在盆地边缘和盆地内部存在很大不同,在盆地边缘主要呈左旋逆倾滑特征,发育宽大的破碎带,而在盆地内部呈正倾滑特征,断层错断了中更新统,断距最大为20cm,甚至影响了上更新统;断层上断点沉积物光释光年龄为134.99±15.52ka和160.95±16.88ka,显示其在晚更新世早期有过明显的活动。
On the basis of field geology survey and optically stimulated luminescence （OSL） dating, the geometrical structure and quaternary activity of the Yunyang basin segment of Yunyang-Yunxi faultshave been studied. The results show that there are huge differences between the edge and inside of the Yunyang basin in fault structure; the secondary fault on the basin edge is a wider dip-slip reverse fault, while the other secondary fault inside of the basin is a normal dip-slip fault, and has more stronger activity. The maximum fault displacement is about 20 cm; the sediment＇s age （OSL） of the top failure point is 134.99±15.52 ka and 160.95±16.88 ka. This indicates that the last fault active period is in the late Pleistocene.
出处
《大地测量与地球动力学》
CSCD
北大核心
2017年第2期122-126,共5页
Journal of Geodesy and Geodynamics
基金
中国地震局社会公益研究项目(1521401800062)~~
