Research For Sedimentary Environment Of Changcheng System Of Mesoproterozoic In Ceyu-Lincheng,Hebei Province

The study area is located in the southwest of Hebei Province,the southern section of the Taihang Mountains in the East,tectonically belonging to two tectonic units of North China platform anteclise in eastern Shanxi.The Changcheng System of Mesoproterozoic profile complete sedimentary sequence of sedimentary structure clear,obviously,is an excellent regional sedimentary facies analysis.In this paper,the application of modern theories and methods of sedimentology,stratigraphy,petrology,lithofacies palaeogeography,means of study,combined with outcrop slices identification,systematic analysis of sedimentary facies,sedimentary environment and characteristics of the strata in the Changcheng System.Of the Middle Proterozoic the Changcheng System after the analysis can clearly see that the rock type in the conglomerate,sandstone,siltstone and mudstone of terrigenous clastic rocks.In Tiantai Mountain,the Mount Cangyan,its growth is most complete,the the Great Wall Department of Changzhou ditch group divided into three sections.With the lower down Proterozoic granite and gravelly coarse sandstone unconformity,and Middle Proterozoic group in fault contact with Zhao Jia Zhuang,and the overlying Early Paleozoic Cambrian Mount Holyoke group is in fault contact,or Steamed Buns and Cambrian unconformity group.Only the development of a Wengcheng formation,the thickness of 58.3m.Tiantai Mountain and Mount Cangyan development is complete,the thickness of 233.45 m,156.6m.In the study of sedimentary facies of the Changzhou formation in the Lincheng area of the the Changcheng System,the sedimentary environment,which is dominated by wave and tide,is mainly formed by the wave.The sedimentary features of large wave bedding and ripple at the same time,the development of the sedimentary characteristics of the tide.The Great Wall,Changzhou ditch group to the bottom of the conglomerate and pebbly sandstone,middle to feldspar sandstone,containing glauconite quartz sandstone,quartzite sandstone in the upper part.After the development of the bottom,the deposition of the front and the tidal flat and tidal flat can be caused by the relative movement of the sea level or the sub phase environment.A sedimentary model of development characteristics of phase wave oblique bedding and sandstone sedimentary tidal flow of the coastal shoal.