A Study On Dendrolite Of The Cambrian Furongian In The Fuzhouwan Section,Liaodong Peninsula

The profile of Fuzhou section is located in Liaodong Peninsula,northeast of North China platform,where there are a lot of microbial carbonate dominated biomounds in the Paleozoic.The Cambrian Furongian of North China platform can be divided into Changshan formation and Fengshan formation,and three third-order sequences can be identified.The dentrolite biomounds of Furongian in the study area are mainly developed in the forced regression system domain at the top of the tertiary sequence,representing the products of the relative sea level decline period,which is not in line with the classic sequence stratigraphic model.The abundant sedimentary phenomena such as the outcropping of a large number of dentrolite and the identification of tertiary sequences in the section of the study area provide valuable examples for the study of Cambrian microbial carbonate rocks.Dentrolite is a kind of non striated layered microbial rock with dendrite medium structure.Due to its limitation of distribution,there are few academic researches on it,and its definition is also confused,especially because of the transition relationship with clot,which makes it difficult to distinguish them.In this paper,the macroscopical and micro characteristics of the Cambrian Furongian tree in the profile of Fuzhou section were studied and analyzed systematically.Under microscope,the residual sheath of calcified cyanobacteria sheath was identified by Epiphyton and accompanied by Renalcis,Hedstroemia,Bacinella and Girvanella.The remaining substances were studied emphatically,and the species were divided into five types according to the different morphological structure.The main species of the study area were the crude branching appendages.The discovery of various calcified cyanobacteria residues further proves that the dendrite biomock in the study area is a microbial carbonate rock formed by the microbial mat or microbial membrane dominated by calcified cyanobacteria.In addition,pyrite particles are widely observed under microscope,which indicates that sulfate returning cyanobacteria may play a role in the formation of Cambrian hibiscite biomock in Liaodong Peninsula The role of prednisone.The growth mode of dendrite in the dendrite biomock can be divided into four stages: ?1trunk extension and basic expansion;?2 branches;?3 expansion and convergence,and then repeat stages ?2 and ?3 until the growth of ?4 is completed.The formation of dendrite biomock is complicated and diverse.The formation of the dendrite biomock in the study area is mainly due to the calcification of cyanobacteria sheath,the calcification of EPS and microbial mat,the capture and binding of microbial mat,and the role of sulfur reducing cyanobacteria.The main role of this study is mineralization,and the capture and binding of microbial mat are mainly reflected in the local.This paper studies the macroscopical and microscopic studies of the Cambrian Furongian dendrite biomock in Liaodong Peninsula,and speculates and discusses its formation process.However,the specific genetic mechanism of the formation of dentrolite still needs to be further studied and discussed.