皖北新元古代刘老碑组滑塌沉积及其地质意义  

Neoproterozoic slumping deposit in the Liulaobei Formation in the north of Anhui and its implication

作　　者：李双应[1] 洪天求[1] 郑文武[1] 贾志海[1] 

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2003年第6期1115-1120,共6页Journal of Hefei University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(49872012);教育部科学技术研究重点资助项目(99068)

摘　　要：安徽北部淮南、凤阳地区刘老碑组为一套页岩、钙质泥岩和泥灰岩沉积,厚度685～857m,中上部发育Chuaria化石群。刘老碑组中段发育一套滑塌沉积。滑塌沉积1～3层,单层厚30～200cm,由粉砂质泥岩、钙质泥岩、泥质粉晶灰岩及含石英粉砂粉晶灰岩组成。滑塌沉积中褶皱发育,有平卧不对称褶皱、旋转滑塌等。滑塌褶皱轴面产状表明,存在一个走向近EW,向SE154°±倾斜的大陆边缘斜坡。并且推测发育Chuaria化石群的刘老碑组中段页岩可能形成于水体较深的大陆边缘环境。The Liulaobei Formation (LF) at Huainan and Fengyang areas in the north of Anhui consists of deposits of shale, calcilute and marl,its thickness is 685~857 m, and the Chuaria fossil assemblage develops on the middle and upper members of the LF. Slumping deposits, which comprise silt-mudstone, calcilutite, mudmicrite and quartz silt-bearing micrite,occur on the middle member of the LF,and 1~3 beds are found out with the bed thickness being 30~200 cm. Recumbent asymmetric folds, rotational slumps and so on are present in the slumping deposits. Fold axial surface attitudes indicate a palaeoslope with the strike being EW and the dip SE154°±. Furthermore, it is inferred that the middle member of the LF,in which the Chuaria fossil assemblage develops,belongs to the deep-sea continental margin.

关 键 词：安徽 刘老碑组 新元古代 滑塌沉积 

分 类 号：P512.2[天文地球—地质学]