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混合沉积是沉积学中一个新的研究领域,研究区古生界沉积岩石类型多样,碳酸盐岩和碎屑岩交替出现,为混合沉积的研究提供了良好的实例。在古生代地层沉积格架系统研究基础上,对研究区各时期沉积格局及演化规律进行分析。经过基础性研究后,认为研究区发育以晚奥陶世、早志留世沉积为代表的碎屑岩—碳酸盐岩混积台地以及以早寒武世沉积为代表的碎屑岩—碳酸盐岩混积陆棚沉积2种混积相。碎屑岩—碳酸盐岩混积台地是主要发育于陆源碎屑滨浅海、砂泥质潮坪与碳酸盐缓坡或台地的过渡地带的台地沉积。混积陆棚是指同时发育碎屑岩与碳酸盐岩2种沉积的陆棚。研究区混合沉积主要发育于早古生代早期的镶边碳酸盐岩台地—欠补偿盆地组合和泥盆纪—二叠纪碎屑岩潮坪—碳酸盐岩台地组合内。
Mixed deposition is a new research area in sedimentology. The sedimentary rocks of the Paleozoic in the study area have various types of rocks, and the alternation of carbonate rocks and clastic rocks provides a good example for the study of mixed sediments. Based on the study of the sedimentary framework system of the Paleozoic strata, the sedimentary pattern and evolution law of each period in the study area are analyzed. After the basic research, it is considered that the clastic-carbonate mixed platform represented by Late Ordovician and Early Silurian sediments and the clastic rocks represented by Early Cambrian sediments-carbonate There are two kinds of sedimentary facies deposition in the salt rock mixed land shelf. Clastic rock - carbonate mixed platform is mainly formed in the terrestrial detritus coastal shallow sea, sand tidal flat and carbonate gentle slope or platform transitional terrestrial deposition. Silt mixed shelf refers to the simultaneous development of two kinds of clastic rocks and carbonate sedimentary shelf. The mixed sediments in the study area mainly developed in the early Paleozoic early Cambrian carbonate platform-undercompensated basin combination and Devonian-Permian clastic tidal flat-carbonate platform combination.