湘西王村剖面寒武系浊积岩特征研究

Study of Characteristics of Cambrian Turbidite of Wangcun Profile in Western Hunan

湘西王村地区的寒武系代表江南斜坡相沉积序列，传统的下寒武统划分为杷榔组、清虚洞组；中寒武统划分为敖溪组、花桥组（下部）；上寒武统划分为花桥组（上部）、追屯组。其中，花桥组中浊流沉积最为发育，包括经典浊积岩和高密度浊流沉积两种类型．经典浊积岩的特征完全可以由鲍玛层序来描述，但最常见的是AE、CDE组合等，其岩性主要为泥灰岩和泥晶灰岩。高密度浊流沉积粒度较粗，常含有细砾组分。常见粗尾粒序层理，也可见平行层理和中至大型交错层理，它们在垂向上构成似鲍玛层序，如ABC等。浊流的主要沉积场所是斜坡的中下部。

The Cambrian sedimentary sequence in Wangcun region, West Hu＇nan, is on behalf of tile southern Changiiang slope facies, the traditional division of the Lower Cambrian Balang, Qingxudong Formations; Middle Cambrian is divided into Aoxi, Huaqiao Formations （the lower part of ）; Upper Cambrian Huaqiao divided into Formations （upper）, to recover Tuen Fornlation. Among them, Huaqiao Formation turbidite most development, including the classic and high-density turbidites are two types of turbidite deposition, classic characteristics of turbidites can be described by the Bouma sequence, t）ut the most common AE , CDE portfolio in terms of their lithology mainly marl anti mudstone. High-densily turbidity current deposits are with coarse grain size, which often contain fine gravel component. Common coarse tail graded bedding, parallel bedding and can also be found medium to large-scale cross bedding, they constitute a vertical like Bouma sequence, such as the ABC and so on. The main location is turbidite deposition in the lower part of the slope, basin margin and basin plain turbidite deposits much less than the slope.