摘要
采用热释光(TL)测年的方法对南宁盆地城区埋藏阶地及南宁盆地外围地区三级阶地进行了年代学对比,发现两者形成年代相近,从而确定城区埋藏阶地为三级阶地。同时对城区工程钻孔中出现阶地物质的钻孔进行统计分析,通过Sufer软件做出城区三级阶地厚度等值线图和顶面高程等值线图,找出城区三级阶地沉降特点,结合心圩韦村断裂峙村至老口段及屯里断裂中更新世活动特点,认为南宁盆地三级阶地的沉降,与心圩韦村断裂的峙村至老口段中更新世持续而剧烈活动有关,其沉降中心持续沿往东南方向迁移,但东南面边界为屯里断裂控制,从而使城区沉降最为明显。
The city buried terrace and the third terrace of the surrounding area of Nanning basin are found that both of them is formed in a similar age by comparing their geochronology with the thermoluminescence（TL） dating methods,it can determine that the city buried terrace is the third terrace.At the same time,the drillings with terrace material of the city project are counted and analysed,used the software of Sufer to draw the thickness isoline graphs and the top elevation isolines of the city third terrace,the sedimentation characteristics of the city third terrace are found,coupling the characteristics of pleistocene from Xinxu-Wei village fracture to the Laokou and Tunli fracture,the sedimentation of the third terrace in Nanning basin have some connection with the sustaining and violent activities of the pleistocene from Xinxu-Wei village fracture to the Laokou and Tunli fracture are considered,the subsidence center keeps up a steady move to the South-East,but the boundary of the South-East are controlled by Tunli fracture,so the sedimentation of the city becomes more obvious.
出处
《东华理工大学学报（自然科学版）》
CAS
2010年第1期29-35,共7页
Journal of East China University of Technology(Natural Science)
基金
广西科学研究与技术开发计划项目"广西北部湾经济区深浅构造耦合作用及其与地震关系研究"(桂科攻0816006-6)
广西科学研究与技术开发计划项目"广西北部湾经济区发震构造与未来地震潜势研究"(桂科攻0993001-1)联合资助
关键词
南宁盆地
三级阶地
沉降运动
心圩韦村断裂
Nanning basin
the third terrace
movement of sedimentation
Xinxu-Wei village fault
