郯庐断裂带白垩纪伸展活动对合肥盆地的制约  

Constraints of Cretaceous extension of Tan Lu fault zone on Hefei Basin

作　　者：黄蒙[1] HUANG Meng(Anhui Geological Survey Institute(Anhui Institute of Geological Sciences),Hefei 230000,China)

机构地区：[1]安徽省地质调查院(安徽省地质科学研究所),安徽合肥230000

出　　处：《世界有色金属》2020年第12期58-59,共2页World Nonferrous Metals

摘　　要：本文通过对郯庐断裂带合肥盆地盆缘断层及盆内同沉积断层擦痕应力场反演等多方面的综合研究,推演出白垩纪时期郯庐断裂带伸展规律:早白垩世早-中期、晚期至晚白垩世,伸展方向由北西西-南东东向、北西-南东向转变为近南北向,总体具顺时针旋转特征。结合合肥盆地白垩纪地层分布格局分析发现,盆内沉降带由北北东向转变为近东西向以及最大沉降中心逆时针方向迁移均是当时(晚中生代)伸展方位转变的结果。Based on the comprehensive study of the stress field inversion of the basin margin faults and synsedimentary faults in the basin of the Tan Lu fault zone in Hefei Basin,this paper deduces the extension law of the Tan Lu fault zone in the Cretaceous period:from the early middle stage of Early Cretaceous to the late Cretaceous,the extension direction changed from nww-se,NWSE to nearly ns,with clockwise rotation characteristics Sign.Combined with the analysis of Cretaceous stratigraphic distribution pattern in Hefei Basin,it is found that the change of subsidence zone from NNE to EW and the migration of the largest subsidence center in the basin in an anticlockwise direction are the results of the extensional orientation transformation at that time(Late Mesozoic).

关 键 词：郯庐断裂带 合肥盆地 基底断裂 伸展方向 

分 类 号：P618.13[天文地球—矿床学]