Reserch On Multi-stratigraphic Division Of Carboniferous-Permian Section In Guanyinyan, Mojiang Cunty Of Yunnan Province

The section of Guanyinyan,Mojiang county,Yunnan province was a continuous strata from the Upper Carboniferous to the bottom of the Middle Permian. The lower of this section was the light gray,thin to the middle bedded lithic quartz sandstone,within which there are the coal lines,rich in plant fossils. The Upper of this section was gray-dark gray,thick-massive bedded limestone,within which there are a large number of fusulinid fossils.According to the Principles of modern stratigraphic,this article divided the section to the lithostratigraphic units. And divided several fossil zones according to the distribution of fusulinid,foraminifera and plants fossils in the strata. And research on the chronostratigraphy of fossils according to the age assignment and regional comparison.A lot of the fusulinid and the non-fusulinid foraminifera was collected in the Upper 395m of section of the Guanyinyan. A systematic and detailed biostratigraphic study was Carried out after it. During the laboratory analysis,13 genera and 26 species was identified in 65 individuals of the fusulinid. The accurated location of the fusulinid fossil zone was Established in the section and was compared with other regions of fusulinid fossil zone in the Lower-Middle Permian. Respectively,from the bottom were the Triticites~Eoparafusulina pusilla assemblage zone;the Darvasites sinensis~ Pseudofusulina vulgaris assemblage zone;the Schubertella~Rugosofusulina paramoderata oppelzone;the Rugosofusulina paramoderata ~Pseudofusulina krotowi interval zone;Pseudofusulina krotowi range zone. The 6 fossil zones was established of non- fusulinid foraminifera base on the 18 genera and 43 species in 65 individuals. from the bottom were : Nodosaria longissima~Tetrataxis minima latispiralis assemblage zone,Langella conicula~Globina elliptica assemblage zone,Nodosaria parva~Palaeotextularia bella Lipina assemblage zone,Climacammina hunanica~Climacammina bicammina interval zone,Nodosaria tenuisepta~Climacammina bicammina interval zone,Globivalvulina graeca Reichel range zone。There is no fusulinid fossil in the lower part of the Guanyinyan section. The stratigraphic classification was mainly based on the plants fossils. The plants fossils was abundant in this part of the section,include 8 genera and 17 species,and was has the Late Carboniferous-Early Permian flora characteristic. The Gigantonoclea sp. was occurred in the 38 horizon of the section,which as identified after the Permian. So,this thesis thought that the appearance of Gigantonoclea sp. is the beginning of the Permian,or the boundary of the Carboniferous the Permian is between the 37 horizon and the 38 horizon.The mainly study object is fusulinid in this thesis,but combine a variety of other fossils and the lithostratigraphic unit. on the base of this , the further chronostratigraphic division was carried out,and the boundary of chronostratigraphic unit was established of the guanyinyan section in this thesis, which was the Zisongian,Longlinian,Luodianian. The true sense of the multiple stratigraphic division was achieved in this thesis,at the same time,this thesis improved the study accuracy of the biostratigraphy of the Upper Carboniferous~ Lower Permian in this region,and build the basis for the high-precision multi-stratigraphic division and the global correlation of stratigraphic.