Sequence Stratigraphy and Sedimentary Facies Analysis of Micangshan Stratigraphic Minor-region (West Section) in South Shaanxi, China
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摘要: 研究区位于扬子陆块北缘，地层区划隶属米仓山地层小区。新元古代—三叠纪地层出露较全，以新元古代—古生代地层为主体，缺失中上志留统、泥盆系、石炭系。在研究区划分了11种主要沉积相类型。新元古界—下古生界共划分7个层序，晚古生界划分出3个层序。经研究认为，克拉通盆地边缘沉积受构造相对活动期和平静期交替控制，在岩相上表现为滞流盆地相发展为陆棚相，最后发展为较稳定的碳酸盐岩台地相的交替出现。Abstract: The study area is located in the northern margin of the Yangtze craton, and the stratigraphic division belongs to the Micangshan stratigraphic minor-region in South Shaanxi. The neoproterozoic-triassic strata, dominated by the neoproterozoic-paleozoic strata, are missing the middle-upper Silurian, Devonian and carboniferous. The study area is divided into 11 main types of sedimentary facies. There are seven sequences in neoproterozoic-lower Palaeozoic and three sequences in late Palaeozoic. It is believed that the margin of the craton basin is alternately controlled by the relative active and quiet periods of tectonics, and the lithofacies shows the alternation from stagnant basin facies to shelf facies, and finally to stable carbonate platform facies.
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