论文部分内容阅读
通过分析石炭纪—早二叠世滇黔桂盆地北缘深水区的地层序列和沉积特征,探讨沉积演化过程及其控制因素。研究区深水地层序列包括下述的9个岩石地层单元:鹿寨组(C_1lz)、巴平组(C_1bp)、下如牙组(C_1xr)、上如牙组(C_1sr)、王佑组(C_1w)、睦化组(C_1m)、打屋坝组(C_1dw)、南丹组(C_1-P_1nd)和船埠头组(C_1c),并且可以识别出4种主要的深水沉积相:台间盆地相、斜坡相、深水陆棚相和台前斜坡相,以砂岩、碳质页岩、硅质泥岩、硅质岩、钙屑碎屑岩、泥晶灰岩和白云质灰岩为主要特征,与桂西南深水盆地的差别显著。依据地层序列和沉积组合的时空分布特征,可以将石炭纪—早二叠世滇黔桂盆地北缘深水区的沉积演化划分为3个阶段:1)裂谷作用强烈期(早石炭亚纪汤耙沟期早期);2)裂谷作用减弱期(早石炭亚纪汤耙沟期中期—德坞期);3)裂谷作用稳定期(晚石炭亚纪—早二叠世)。
By analyzing the sequence and sedimentary characteristics of the deep water in the northern margin of Carboniferous - Early Permian Dianqianui Basin, we discuss the sedimentary evolution process and its controlling factors. The deep-water sequence of the study area includes the following nine lithostratigraphic units: C_1lz, C_1bp, C_1xr, C_1sr, C_1w, C_1m, C_1dw, C_1-P_1nd and C_1c, and four main types of deep-water sedimentary facies can be identified: the platform between the platform and the slope Facies, deep shelf facies and foreground slope facies, with sandstone, carbonaceous shale, siliceous mudstone, silicalite, calcareous clastic rock, limestone and dolomitic limestone as the main features, Deepwater basin differences are significant. Based on the temporal and spatial distribution of sedimentary sequences and sedimentary assemblages, the sedimentary evolution of the deep-water area in the northern margin of the Carboniferous-Early Permian Dianqiangui basin can be divided into three stages: 1) intense rifting (early Carboniferous Decoction Early Rake Ditch); 2) Weakened rifting (Early Carboniferous); and (3) Rift stable period (Late Carboniferous-Early Permian).