论文部分内容阅读
龙门山南段前陆盆地发育了巨厚的陆源沉积岩,其中砂岩分布最广、含量最多。在详细观察描述砂岩宏观特征的基础上,通过薄片鉴定、粒度分析等方法,研究了中—新生代砂岩的物质成分及结构特征,指出砂岩的成分成熟度和结构成熟度均中等至低,并按成分—成因分类方法划分了砂岩的岩石类型。根据砂岩特征,分析岩石的组成物质来源于龙门山造山带,再结合前陆盆地充填地层的沉积特征,提出了砂岩的沉积模式。
Longmen Shannan foreland basin developed thick terrigenous sedimentary rock, sandstone which is the most widely distributed, most content. Based on the detailed description of the macroscopic characteristics of sandstones, the material composition and structural characteristics of Mesozoic-Cenozoic sandstones were studied by means of flake identification and particle size analysis. It was pointed out that the compositional maturity and structural maturity of sandstone were both moderate to low and The rock type of sandstone is divided by composition-genesis classification. According to the characteristics of sandstone, the composition of the rock is analyzed from the Longmenshan orogenic belt. Combined with the sedimentary characteristics of the filling strata in the foreland basin, the sedimentary model of sandstone is proposed.