The stratigraphic order characteristics of coal-bearing strata in the Lower and Middle Jurassic in Shenmu area, North Shaanxi

The Jurassic coalfield of north Shaanxi,is the largest coalfield probed in China at present.Based on the production and data of regional geological survey in Shenmu area of north Shaanxi with 1:50 000,this paper systemically analyzes the stratig raphic order characteristics of coal-bearing strata in Mesozoic,and the sedimentary patterns in the basin,and the rock-stratum model in this area is established at the first step.Meanw hile this paper reflects the newest progress of the sequence stratigraphic study of the area,and deals with the helpful research on applying the sequence stratigraphy theories to the analysis of the processore-forming and prognostication ore-forming.