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研究区内二叠系—三叠系生物化石较丰富,门类有腕足类、蜓类、珊瑚、菊石、牙形石、双壳类及有孔虫等。这些生物门类明显受沉积环境控制。对研究区内中二叠统—中三叠统的古生物化石进行了详细的分析和埋藏特征研究,根据生物化石在时间与空间上的组合特征,将研究区中二叠统—中三叠统生物群划分为17个生物群落,并论述了各群落的组成、结构和环境特征。研究表明,不同生态类型的群落其分布的地理位置有一定差异,主要体现在以下2个大的区块,即分别分布于研究区的主体区块和其边缘区块,前者以底栖固着型为特征,后者以游泳型及底栖游移型为特征。根据化石群落与沉积特征的组合情况,识别出6种类型的生物相,并总结了其生物相模式,阐述了各生物相中的生物类别、生态类型、典型群落以及对应的沉积相等特征。化石群落的划分和分析对于四川盆地二叠纪—三叠纪的古环境、古地理及其演化的研究具有一定的意义,生物相的研究对于研究区古生物地理学和古板块构造的恢复具有一定的意义。
The Permian-Triassic biofuels in the study area are rich in species, including brachiopods, dragonflies, corals, ammonites, conodonts, bivalves and foraminifera. These biota are clearly controlled by the sedimentary environment. According to the combination features of biofuels in time and space, the paper analyzes the Middle Permian-Middle Triassic paleontology fossils in the study area and analyzes the characteristics of the Middle Paleo-Middle Triassic The biota is divided into 17 biomes and discusses the composition, structure and environmental characteristics of the communities. The results show that there are some differences in the geographical distribution of different ecotype communities, mainly in the following two large blocks, namely the main block and the edge block in the study area respectively. As the feature, which is characterized by swimming and benthic migratory. According to the combination of fossil communities and sedimentary features, six types of biological facies are identified, and their biological facies patterns are summarized. The biological types, ecological types, typical communities and corresponding sedimentary characteristics in each biological facies are expounded. The division and analysis of fossil communities have certain significance for the study of paleoenvironment, palaeogeography and evolution of the Permian-Triassic in the Sichuan Basin. The study of the biofacies has certain significance for the restoration of palaeogeography and the ancient plate tectonics in the study area Meaning.