巢湖二叠系栖霞组岩石学特征与沉积环境分析

Characteristic of Petrography and Analysis of the Sedimentary Environment of the Qixia Formation in Chaohu Region

通过野外剖面观察和室内薄片的鉴定,以沉积环境分析为主线,讨论了巢北地区二叠系栖霞组岩石的沉积、成岩特征和所代表的不同沉积环境。该段地层中主要岩性泥晶生屑石灰岩及生屑泥晶石灰岩,其次为硅质岩。根据岩石特征及沉积构造分析了本区栖霞组之沉积环境,主要可分为瀉湖、海湾环境,斜坡环境,台凹环境及开阔台地环境,可划分为两个海侵海退旋回。

Through the outdoor observation of the Qixia formation in Chaohu re tification of slices, discussed the sedimentary course,the sedimentary characters and gio the n and the indoor iden- different sedimentary environments. The lithology of this rock formation consists of micritic limestone and bioclastic micritic limestone and chert. According to sedimentary characteristics and the conformation, the sedimentary environments in this Qixia area can be divided into the lagoon environment, the Gulf environment, the slope environment, the concave environment and the open platform environment, and the sedimentary course can be divided into two transgression and regression cycles.