鄂尔多斯盆地南部渭北隆起发育时限及其演化  

Development time and evolution characteristics of Weibei uplift in the south of Ordos basin

作　　者：王建强[1] 刘池洋[1] 闫建萍[1,2] 赵红格[1] 高飞 刘超 

机构地区：[1]西北大学大陆动力学国家重点实验室地质学系,西安710069 [2]兰州大学资源环境学院,兰州730000 [3]陕西延长石油集团研究院,西安710075 [4]中海石油(中国)有限公司天津分公司,天津300452

出　　处：《兰州大学学报（自然科学版）》2010年第4期22-29,共8页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金重点项目(90814005);国家自然科学基金项目(40902032);国家重点基础研究发展计划(973计划)项目(2003CB214600);西北大学大陆动力学国家重点试验室开放课题

摘　　要：通过对渭北隆起残存地层展布、沉积特征及构造变形等研究,结合磷灰石裂变径迹测试分析,认为渭北隆起后期经历了明显的改造,在早白垩世末以前应为鄂尔多斯盆地的一部分,总体以沉降接受沉积为主,此时隆起并未发育;而其整体作为正向构造单元应始于早白垩世末以来(约114～83 Ma),大致与鄂尔多斯盆地的消亡时间同步,且经历了早白垩世末—古新世的整体抬升剥蚀和始新世以来的断块翘倾剥蚀两大演化阶段.Based on the study of stratigraphic characteristics, sedimentary features and tectonic deformation, combined with the analysis of apatite fission rack dating, etc, it was suggested that the Weibei uplift had experienced a significant late reformation, which constituted the main part of the Ordos basin, and generally accepted deposition before the end of early cretaceous without the development of uplift. As a positive tectonic unit it should have started between the end of early cretaceous and late cretaceous period （about 114-83 Ma） in line with the demise of the Ordos basin. Its evolution can be divided into the overall uplift stage in late early cretaceous-paleocene and the fault block tilted stage after the Eocene.

关 键 词：渭北隆起 发育时限 裂变径迹 渭河地堑 

分 类 号：P542[天文地球—构造地质学]