单岩性米级旋回在旋回地层划分中识别——以北京西山张夏组为例  

SINGLE-LITHOLOGY METER-SCALE CYCLES IN CYCLIC STRATIGRAPHY:A CASE STUDY OF THE CAMBRIAN CHANGHIA FORMATION IN XISHAN,BEIJING

作　　者：杨俊才[1,2] 马飞宙[3] 

机构地区：[1]中国矿业大学(北京)地球科学与测绘工程学院,北京100083 [2]山西省地质调查院,山西太原030006 [3]中国地质调查局,北京100037

出　　处：《地层学杂志》2014年第3期311-316,共6页Journal of Stratigraphy

基　　金：中石化华北地台烃源岩分布及两大裂谷系盆地研究项目资助

摘　　要：通过对传统米级旋回成因的讨论,提出了在传统的四种米级旋回之间存在米级旋回的过渡类型,即单岩性米级旋回的观点,并从米级旋回的成因及层序—岩相古地理方面对单岩性米级旋回的形成模式进行了分析,在野外露头对北京西山张夏组碳酸盐岩进行了旋回地层划分,就沉积间断面不易识别的旋回地层进行了讨论,并识别出了单岩性米级旋回。层序—岩相古地理背景下的米级旋回模式,可对米级旋回的平面展布进行预测;单岩性米级旋回的发现,有利于提高三级旋回层序识别及划分的精度。We propose the concept of single-lithology meter-scale cycle as a supplement to the four traditional types of meter-scale cycles.The origin of single-lithology meter-scale cycles is analyzed using sequence stratigraphic and paleogeographic data,using examples from the carbonate sequence of the Cambrian Changhia Formation in Xishan of Beijing.The difficulties in the identification of sedimentary discontinuities in cyclic stratigraphy are discussed.The model of meter-scale cyclic stratigraphy,when combined with lithofacies paleogeographic data,can be used to predict the spatial distribution of meter-scale cycles.The introduction of single-lithology meter-scale cycles will help to improve the subdivision,recognition,and correlation of third-order cyclic sequences

关 键 词：旋回地层 层序地层学 单岩性米级旋回 成因模型 张夏组 寒武系 西山 北京 

分 类 号：P539.2[天文地球—古生物学与地层学] P534.41[天文地球—地质学]