海原—六盘山地区活动构造的活动时间厘定:来自光释光测年的限定  

Determination of the Timing of Active Structures in Haiyuan-Liupan Shan Area: Constraints from OSL Dating

作　　者：肖骏[1,2] 陈汉林[1,2] 林秀斌[1,2,3] Karl-Heinz Wyrwoll 王旭龙[4] 

机构地区：[1]浙江大学地球科学系,浙江杭州310027 [2]教育部含油气盆地构造研究中心,浙江杭州310027 [3]School of Earth and Environment,The University of Western Australia,35 Stirling Highway,Crawley,WA6009,Australia [4]中国科学院地球环境研究所黄土与第四纪地质国家重点实验室,陕西西安710075

出　　处：《地球科学（中国地质大学学报）》2011年第6期993-998,共6页Earth Science-Journal of China University of Geosciences

基　　金：国家自然科学基金青年科学基金项目(No.41102128)

摘　　要：海原-六盘山地区位于现今青藏高原东北部,该地区活动构造的研究不仅可以为地震安全评价提供依据,也可以为第四纪青藏高原的扩展提供限定.在野外地质调查的基础上,运用光释光定年技术,限定研究区活动构造的活动时间.研究显示,海原-六盘山断裂和香山-天景山断裂在晚第四纪存在剧烈活动,产生了如角度不整合(夷平面)、褶皱和断层构造.这些结果表明,研究区应该作为地震安全评价的重点关注区域,同时也显示青藏高原东北部在晚第四纪存在持续的扩展.Haiyuan-Liupan Shan area is located in the northeastern margin of present Tibetan plateau.The study of the active structures in this area will provide constraints not only for the seismic evaluation but also for the northeastward growth of the plateau.Based on the geological survey and optically stimulated luminescence（OSL） dating,the timing of the active structures has been determined.The results indicate that active structures occurred in Late Quaternary along the Haiyuan-Liupan Shan and Xiangshan-Tianjing Shan faults,forming the structures such as angular unconformity（planation surface）,fold and fault.This suggests that Haiyuan-Liupan Shan area should be considered as a focus of seismic evaluation,and also that the Tibetan plateau grew in its northeast margin in Late Quaternary.

关 键 词：青藏高原东北部 构造学 活动构造 光释光 

分 类 号：P542[天文地球—构造地质学]