摘要
临潼—长安活动断裂带是渭河盆地内部西安凹陷与骊山凸起之间一条重要的活动断裂带,由2条次级断层组成,以灞河、皂河为界划分为北东、中、南西3段,前人对晚更新世以来的断裂的活动性存在2种不同的认识。为了确定临潼—长安断裂带晚更新世以来的活动性,文中以黄土S1、L1S和S0为确定垂直位移的标志和年代标尺,通过DEM地貌分析、断层露头调查,结合地壳形变资料,分析得出临潼—长安断裂带北东段晚更新世以来断裂活动性强,中段活动性其次,南西段活动性弱,与DEM显示的现今临潼—长安活动断裂带上下盘的地貌差异有很好的吻合性。
Lintong-Chang’an fracture zone is an important active fault controlling the Lishan uplift and Xi’an depression in the Weihe Basin.It consists of two secondary faults,and is divided into three sections of northeastern,central and southwestern by Bahe and Zaohe.Predecessors have two kinds of different understanding of fault activity since the Late Pleistocene.In order to determine the activity of the Lintong-Chang’an fracture zone since the Late Pleistocene,the loess S1,L1S and S0 are selected to be the marker and the timescale to determine the fault vertical displacement in the study.By means of DEM geomorphological analysis and the fault outcrop survey,and combined with the crustal deformation data,the research result shows that the activity of the northeastern section is the strongest in the Lintong-Chang’an fracture zone since the Late Pleistocene,the central section is the second and the southwestern section is the weakest.It is consistent with the geomorphological differences shown by DEM in hangwall and footwall of the modern fault zone.
出处
《地学前缘》
EI
CAS
CSCD
北大核心
2013年第4期46-57,共12页
Earth Science Frontiers
基金
中国地质调查局项目'秦岭北缘断裂带构造特征及构造地貌过程研究'(1212011120102)
中国地质调查局项目(1212011120099)
