A Study On The Cretaceous Sedimentary Facies And The Regularity Of Uranium Enrichment In The Celaomiao Area

Celaomiao area is located in the east of Bayingebi basin and the north of wolf mountain.Predecessors thought research zone uranium enrichment type including primary sedimentary type,diving oxidation zone type and the interlayer oxidation zone type three types of uranium enrichment.The interlayer oxidation zone type uranium deposit is the mainly.Early in the region have been drilling of uranium,but have not got any uranium exploration breakthrough.Reason may be that the layer is developmental characteristics,sedimentary facies types and their distribution is not clear.And main enrichment of uranium enrichment of sedimentary basin marks and interlayer oxidation zone type uranium deposits are related to the depositional model is not completely consistent,etc.In this paper,the integrated use of field section,core,logging and well logging data,according to the theory and methods of stratigraphy and sedimentology,to division cretaceous strata of the Celaomiao area.And the study of sedimentary facies types and their distribution characteristics.On the basis of the conducted on uranium enrichment type were identified in the study area,the classification characteristics and the favorable uranium enrichment region of uranium with research.In this paper,according to a study measuring the Celaomiao area cretaceous formation development Bayingebi Formation,Suhongtu Formation and Wulansuhai Formation in Celaomiao area.And Bayingebi Formation is divided into three sections.The lower member of the Bayingebi Formation have the largest lake pan.The middle member of the Bayingebi Formation,affected by the epigenetic reduction,is mottled layer.Suhongtu Formation is the basalt layer.The whole section of Wulansuhai Formation is the red layer.Due to the influence of tectonic movement,the directional of the provenance in Celaomiao area changes in different periods.In the period of the lower member of the Bayingebi Formation,Provenance is from Baoyintu uplift.In the period of the middle member of the Bayingebi Formation,the Wolf mountain uplift and become the main source.In the period of the upper member of the Bayingebi Formation,Due to the asymmetrical uplift,northwest become the main source in the study area,and the Wolf mountain also provides part of the sediment.The sediments of Suhongtu Formation are spewing basalt which are mainly from east,west Black Mountain and big Black Mountain.Now because of uplift and denudation,the sediments of the Wulansuhai Formation,which is Residueing in the study area,derived from the Baoyintu uplift which is in the northwest.The lake facies and braided river delta develop in the lower member of the Bayingebi Formation.The alluvial fan develop in the middle member of the Bayingebi Formation.The near-shore underwater fans develop in the upper member of the Bayingebi Formation.The alluvial fan develop in the Wulansuhai Formation.Analyze the conditions within the study area uranium enrichment.Discovery zone type uranium enrichment is primary sedimentary type insteading of the interlayer oxidation zone type.Uranium enrichment period of major development in the depression between alluvial fan,space between braided stream and fan-middle leading dege of the nearshore subaqueous fan.The depression between alluvial fan is in the middle member of the Bayingebi Formation.And space between braided stream and fan-middle leading dege of the nearshore subaqueous fan are in the upper member of the Bayingebi Formation.The depression between alluvial fan is the most conducive to the enrichment of uranium.