从断层擦痕反演的郯庐断裂带南段合肥盆地白垩纪构造应力场  

Cretaceous crustal stress field characteristic of Hefei Basin in southern Tanlu fault from inversion the fault striation

作　　者：邓佳良 储东如[1] 王翔[1] 汪雅菲 吴昊 沈仕豪 刘家云[1] 吴家富[1] Deng Jialiang;Chu Dongru;Wang Xiang;Wang Yafei;Wu Hao;Shen Shihao;Liu Jiayun;Wu Jiafu(Anhui Institute of Geological Survey,Hefei230001)

机构地区：[1]安徽省地质调查院,合肥230001

出　　处：《地质科学》2020年第2期519-536,共18页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：中国地质调查局地质调查项目(编号:12120113067800,12120113069200);安徽省国土资源科技项目(编号:2009-k-23)资助。

摘　　要：本文通过断层擦痕应力场反演方法,对郯庐断裂带南段合肥盆地白垩纪伸展活动进行了详细研究,厘清了郯庐断裂带南段合肥盆地白垩纪拉伸方向的演变规律。研究结果显示:从早白垩世早-中期、晚期到晚白垩世,拉伸方向由NWW-SEE向、NW-SE向到近SN向转变,具顺时针旋转特征。与西太平洋区大洋板块运动方向对比分析认为:郯庐断裂带南段合肥盆地白垩纪伸展活动发生在弧后拉张的动力学背景下,拉伸方向的演变可能是西太平洋区大洋板块运动方向改变的结果。Based on the method of the fault-striated stress field inversion,the extensional activity of Cretaceous extensional activity of Hefei Basin in the south of Tanlu fault zone was studied in detail and the evolution law of extension direction of it is clarified.The results show that from early-middle stage of the Early Cretaceous and late stage to Late Cretaceous,the tensile direction changed from NWW-SEE to NW-SEE to near SN,with clockwise rotation characteristic.Compared with the ocean plate movement direction in the western Pacific region,it is considered that the Cretaceous extensional activity of Hefei Basin in the south of Tanlu fault zone occurred under the dynamic background of back-arc tension,and the evolution of the extension direction is the result of the movement direction change of the ocean plate in the western Pacific region.

关 键 词：郯庐断裂带南段 合肥盆地 应力场反演 伸展方向 动力学背景 

分 类 号：P542[天文地球—构造地质学]