Sedimentary Micro Phase Characteristics and Sedimentary Environment of Longtan Formation Coal Bearing Rock Series in Qixingguan Area of Guizhou
Longtan formation of Permian is an important coal seam in the middle and west Guizhou,REE,U,Sc,Nb and other key element concentrated in some special geologic condition,so it's a potential are for rare mineral resource.The analyses on the sedimentary phase and sedimentary environment of Lontan formation,Per-mian in Qixingguan district of Bijie has important significance for study the time-space distribution of REE,U,Sc,Nb and other key metallic element.In this paper,base on the field measured section,combine with rock in-dentify,paleontological fossil and so on,the rock association relation of Longtan formation and sedimentary mi-crofacies characteristics are studied and analyzed.According the rock association characteristics,the Longtan formation in the study area is divided into 3 sections,their lithology include gray-deep gray siltite,sandstone,carbonaceous claystone with coal seam 6 to 45 seams,marine shell fossil and continental plant fossil Pecopteris sp.developed which the thickness is 150 to 210 m.Meanwhile,the Longtan formation in the study area is en-sured to be sea-land transient phase delta deposit,3 secondary phase(delta plain,delta edge and delta)and 9 sedimentary micro phase(distributary channel,breached dike and so on)are divided.The sedimentary environ-ment of three lithologic members in Longtan formation of this period are discussed and analyzed,it's thought that the diversion bay and swamp micro phase in the delta plain secondary phase are favorable for the sedimen-tary environment of clay mineral and organic matter,it affords beneficial condition for the concentration of REE,Li and other metal elements.
Sedimentary micro-phaseLongtan formationCoal bearing rock seriesQixingguan di-strictGuizhou
万方数据
维普
