Discussion on Characteristics of GeoChemical and Sedimentary Environments of the Shisanlitai Formation of Fuzhou Bay, Liaoning Province

Key words: 
• East Liaoning Peninsula

Abstract: It is demonstrated by a series of measured data on chemical elements, rare elements and REE elements of the Shisanlitai Formation as follows: Fe2O3/FeO near or more than 2, δEu less than 1, despite one sample of Ceanom less than 0, U/Th ratio less than 0. 75, V/Cr less than 2, Ni/Co less than 5, all of those reflect a high oxidation environment, which is caused by shallow water body of the Shisanlitai Formation. A rich K, SiO2 and REE special mudstone of the Shisanlitai Formation offered plenty of materials for the formation of authegenic monazite. The mudstone contains low CaO less than 0.68%, CaO/MgO less than 0.6, Sr/Ba less than 0.33, which reflect low salinity during diagenetic stage, might be a fresh water lagoon back stromatolite reef environment. The tectonic environment might be a stable stage after Rodinia supper continent crack stage in the Shisanlitai Formation stage.