牟平—即墨断裂带白垩纪构造应力场及转化机制  

CRETACEOUS STRESS FIELD OF THE MUPING-JIMO FAULT BELT AND ITS IMPLICATION FOR TECTONIC EVOLUTION

作　　者：张勇[1,2,3] 任凤楼[4] 龚淑云[5] 张现荣 林曼曼 刘珊珊[1,2,3] 

机构地区：[1]国土资源部海洋油气资源和环境地质重点实验室,青岛266071 [2]青岛海洋地质研究所,青岛266071 [3]石家庄经济学院,石家庄050031 [4]中石化胜利油田分公司西部新区研究中心,东营257015 [5]深圳市地质局,深圳518023

出　　处：《海洋地质与第四纪地质》2013年第2期79-85,共7页Marine Geology & Quaternary Geology

基　　金：1:25万海洋区域地质调查(试点)项目(GZH200900501);国家自然科学基金项目(41202081)

摘　　要：系统地分析了胶莱盆地内部牟平-即墨断裂带的基本组成特征及空间展布,利用古构造应力场测量、反演的分析方法,重塑了该断裂带白垩纪的古构造应力及其演化。结果表明,该断裂带白垩纪运动历史划分为5个阶段:(1)早白垩世中期莱阳期NW-SE向伸展,为造山后的弱引张;(2)早白垩世中晚期青山期近EW向伸展,属于陆内断陷构造;(3)早白垩世末期NW—SE向挤压,这期挤压应力作用发生在早、晚白垩世之间,古太平洋板块向东亚大陆斜向俯冲汇聚产生的走滑作用占据主导地位,是区域构造作用的结果;(4)晚白垩世王氏期近N—S向伸展,可能一直持续到古新世,是古太平洋板块运动方向发生了变化及中国西部特提斯构造体系远程效应的联合结果;(5)古新世晚期的NE—SW向挤压。Cretaceous is a key period for tectonic transformation in eastern China.Comparing to the Tan-Lu fault belt,the Jimo-Muping fault belt is another large-scale tectonic boundary in the east part of China.Many geologists have devoted to the studies of the structural characters and evolution history,especially those in Cretaceous,in the past decades.This time,we,based on the measured data,calculated the Cretaceous tectonic stress fields of the Muping-Jimo fault.The results indicate that the evolutionary history of the fault can be classified into five stages,i.e.1） the Laiyang stage of Early Cretaceous dominated by NW—SE extension,under the control of the post-orogenic extension;2） the Qingshan stage of Early Cretaceous dominated by W—E extension caused by a rifting process;3） the NW—SE compression stage at the end of Early Cretaceous due to the oblique subduction of the Paleo-Pacific Plate under the East Asian continent;4） the Wangshi stage of Late Cretaceous dominated by N—S extension,controlled by the Tethys system and the direction change of the subduction of the Paleo-Pacific Plate;5） the stage of Late Paleocene dominated by NE—SW compression.

关 键 词：牟平—即墨断裂 白垩纪 应力场反演 胶莱盆地 

分 类 号：P736.1[天文地球—海洋地质]