河南登封地区寒武系第三统张夏组米级旋回及其演化  

METER-SCALE CYCLES AND THEIR EVOLUTION FROM THE CAMBRIAN CHANGHIA FORMATION,DENGFENG AREA,HENAN

作　　者：齐永安[1] 孙长彦[1] 王敏[1] 李妲 代明月[1] 

机构地区：[1]河南理工大学资源环境学院,河南省生物遗迹与成矿过程重点实验室,河南焦作454000

出　　处：《地层学杂志》2013年第1期101-111,共11页Journal of Stratigraphy

基　　金：国家自然科学基金项目(No.41072003);河南省基础与前沿项目(112300413213);高校博士点基金博导类联合课题(20114116110001)资助成果

摘　　要：河南登封地区寒武系第三统张夏组是一套167m厚的碳酸盐岩地层,出露连续且完整,发育以微生物岩主导和以后生动物扰动灰岩主导的两种米级旋回类型。通过对米级旋回的演化及其沉积学和古遗迹学特征分析,张夏组自下而上由以微生物岩主导的米级旋回逐渐让位于以后生动物扰动灰岩主导的米级旋回;沉积体系由无鲕粒滩的碳酸盐岩台地逐渐向发育厚层鲕粒滩的碳酸盐岩台地演化;沉积环境从潮下低能深水演变为开阔台地,并逐渐变浅形成鲕粒滩、局限台地;沉积岩类型从叠层石、凝块石灰岩等微生物岩逐渐变化为生物碎屑灰岩、生物扰动灰岩和含生物扰动鲕粒灰岩。The Third Series Changhia Formation of Cambrian in the Dengfeng Area, Henan, deposited the 167 m thick carbonates, display the continuous and abundant depositional and palaeoichnological records which can be better used for the study of meter-scale cycles. Two main types of meter-scale cycles, respectively dominated by microbiolites and by metazoan bioturbated limestones, can be recognized from Changhia Formation. Based on the evolution of meter-scale cycles and their depositional and palaeoichnological features, The cycles dominated by microbiolites give ways to the cycles dominated by metazoan bioturbated limestones from bottom to top in Changhia Formation; the depositional system evolves from the carbonate platform without oolitic shoals into the platform developed oolitic shoals; the sedimentary environments develop from low energy deep subtidal zone to open platform zone, and gradually become shallower into oolitic shoals and eventually end up with restricted platform; the rock types change from the microbiolites of stromatolite, trombolite into bioclastic limestones, bioturbated limestone and oolitic limestone.

关 键 词：岩石地层 米级旋回 微生物岩 后生动物扰动灰岩 沉积环境演化 张夏组 寒武系 登封 河南 

分 类 号：P534.41[天文地球—古生物学与地层学]