前寒武纪海侵碎屑岩系的沉积序列与层序地层划分——以辽宁凌源剖面常州沟组为例  

SEDIMENTARY CHARACTERISTICS AND SEQUENCE STRATIGRAPHY OF THE CHANGZHOUGOU FORMATION IN THE LINGYUAN AREA,LIAONING PROVINCE

作　　者：郭丽娜[1] 

机构地区：[1]中国地质大学地球科学与资源学院,北京100083

出　　处：《地层学杂志》2014年第2期245-252,共8页Journal of Stratigraphy

基　　金：国家自然科学基金项目(No.40472065);中国石油化工股份有限公司海相前瞻性项目(No.C0800-07-ZS-164)资助

摘　　要：辽宁凌源剖面的常州沟组为大套交错层理粗和含砾砂岩所组成,厚度超过1500m。这套海侵碎屑岩沉积包括潮下坪、潮间坪和潮上坪至局限瀉湖等相带。根据沉积相序列的反复性所代表的旋回性,可以将常州沟组划分出4个三级层序。每个三级层序的三分性较明显,由海侵体系域、早期高水位体系域和晚期高水位体系域组成,其中晚期高水位体系域类似于强迫型海退体系域。辽宁凌源剖面常州沟组沉积相序列的旋回性所表征的层序划分,为探索前寒武纪厚度巨大的海侵碎屑岩系的层序地层划分提供了一个典型实例。The sequence stratigraphy of the Changzhougou Formation in the Lingyuan area of western Liaoning Province is studied on the basis of a comprehensive analysis of sedimentary facies.The Changzhougou Formation consists of a thick succession（1500min thickness）of terrigenous clastic tidal deposits,with massive cross-stratification and an erosional basal surface.According to the stacking patterns of lithofacies sequence and the characteristic of sedimentary structures,the Changzhougou Formation in the Lingyuan area includes subtidal flat,intertidal flat and supratidal flat,and restricted lagoon facies.The Changzhougou Formation can be divided into 4third-order sequences（S.1-S.4）.Each third-order sequence includes three parts,which are the transgressive system tract,early highstand system tract,and late highstand system tract.This paper systematically describes the characteristic of the strata,sedimentary structures and system tracts of each sequence.

关 键 词：层序地层学 沉积相 常州沟组 前寒武系 凌源 辽宁 

分 类 号：P539.2[天文地球—古生物学与地层学] P534.3[天文地球—地质学]