拉萨盆地白垩纪地层的沉积特征及沉积环境

过去曾将拉萨盆地白垩纪地层划分出海陆过渡相及河流相,经研究认为主要是一套障壁海岸环境,局部出现滨岸、及滨岸沼泽和三角洲环境,并没有河流冲积相沉积,根据该地层中岩石组合、沉积构造、古生物特征划分出5种不同的环境类型,在此基础上对该地区白垩纪地层沉积环境的构造背景进行了分析.

Sediment Character and Sediment Environment of the Cretaceous Period Stratum in Lasa Basin

On the basis of the sediment character of the Cretaceous period stratum in Lasa Basin, its sediment environment has been analyzed comprehensively. In the past the set of stratum is divided into transitional facies and river facies. However, the research shows that it is a set of barrier seashore environment, locally appears onshore, onshore marshal and delta environment, and there is no fluvial outwash facies sediment. According to rock association, sedimentary structure, welwitschiopside character it can be further divided into five different environment types, on the basis of this idea the structure context of the Cretaceous period stratum sediment environment can be further discussed and analyzed.