贵州紫云晚石炭世叶状藻礁灰岩微相特征与沉积环境的研究

紫云晚石炭世叶状藻礁发育在碳酸盐岩台地边缘内。研究以碳酸盐岩微相分析为主要手段，对叶状藻礁剖面中岩石的微相特征和沉积环境研究。主要总结出6个微相类型，为生物碎屑粒泥灰岩、生物碎屑泥粒灰岩、球粒生屑泥粒灰岩、叶状藻粒泥灰岩—叶状藻泥粒灰岩、腕足泥粒灰岩、生物碎屑颗粒灰岩。总结了一个在开阔台地与台地边缘过渡带上的局部相模式，由较深水的开阔台地相、叶状藻礁相、台内斜坡相和台内较浅水的斜坡相、较浅水的开阔台地相、台内浅滩相过渡，分析总结了叶状藻礁的沉积环境。微相组合及其在剖面纵向分布规律显示，剖面的总体沉积环境为潮下带浅水开阔台地环境。 

Sedimentary Environment and Microfacies Analysis of the Late Carboniferous Phylloid Algal Reef in the Ziyun County, Guizhou

The late Carboniferous phylloid aglal reef occurs in the carbonate platform margin. In this paper the phyl-loid reef's microfacies characteristic and sedimentary environment are analyzed by the way of detailed section microfa-cies analysis. We summed up 6 carbonate microfacies, i. e. bioclastic wackstone, bioclastic packstone, pelleted bio-clastic packstone, phylloid algal wackstone and packstone, brachiopod packstone, bioclastic grainstone. We sums up a part sedimentary facies model, transfers from the depth open carbonate platform facies, phylloid algal reef facies, inner carbonate platform slope facies, inner carbonate platform shallow slope facies, shallow open carbonate platform facies, to intraplatform shoal facies, analyzing sedimentary environment of phylloid aglal reef. Based on the distribu-tion of microfacies in the section, we can speculate it is the open carbonate platform environment in subtidal zone.