CAJ | 학술논문

采用微相分析的方法,对北京西山下苇甸剖面中寒武统碳酸盐岩的生物组合、颗粒成分、基质类型及其结构等微相特征做了深入研究,区分出8种碳酸盐岩微相类型,即微角砾状生屑-岩屑泥粒灰岩,异地生屑泥粒-粒泥灰岩,含包壳鲕粒和磨圆生屑的泥粒-粒泥灰岩,含包壳鲕粒的颗粒灰岩,海百合茎泥粒灰岩,同心圆鲕粒颗粒灰岩,泥晶鲕粒颗粒-泥粒灰岩,放射鲕粒颗粒-泥粒灰岩.8种微相类型在中寒武统剖面上不等同出现构成了代表两次海平面下降-上升的演化过程,即由徐庄组下部的开阔台地相开始,向上至徐庄组上部变化为滩前斜坡相,张夏组下部又返回至开阔台地相,最后在张夏组上部又以滩前斜坡相告终.
채용미상분석적방법,대북경서산하위전부면중한무통탄산염암적생물조합、과립성분、기질류형급기결구등미상특정주료심입연구,구분출8충탄산염암미상류형,즉미각력상생설-암설니립회암,이지생설니립-립니회암,함포각이립화마원생설적니립-립니회암,함포각이립적과립회암,해백합경니립회암,동심원이립과립회암,니정이립과립-니립회암,방사이립과립-니립회암.8충미상류형재중한무통부면상불등동출현구성료대표량차해평면하강-상승적연화과정,즉유서장조하부적개활태지상개시,향상지서장조상부변화위탄전사파상,장하조하부우반회지개활태지상,최후재장하조상부우이탄전사파상고종.
By means of microfacies analysis, this paper studies in detail the grain composition, the types and texture of the matrix, the microfacies characteristics of the carbonate rocks of Middle Cambrian of Xia-weidian profile in Western Hills, Beijing. The Middle Cambrian carbonate rocks in the studied profile can be mainly divided into eight microfacies types, including microbreccia bioclastic-lithoclastic packstone, al-lochthonous bioclastic packstone and wackstone, packstone and wackstone with coated micrite ooids and abraded bioclastic, grainstone with coated micrite ooids, crinoids packstone, ooid grainstone with concentric ooids, grainstone and packstone with micrite ooids, grainstone and packstone with radial ooids. Analysis of all the microfacies reveals that the Middle Cambrian of the studied profile had experienced two sedimentary facies sequences of sea level rise. One of the sedimentary facies sequences starts from an open marine facies of the lower part of Xuzhuang Formation, and gradually evolves upwards to a slope facies of the shoal front of the upper part of Xuzhuang Formation. The others develop from an open marine facies of the lower part of Zhangxia Formation to a slope facies of the shoal front of the upper part of Zhangxia Formation.