Paleoclimatic Change And Sedimentary Response Of The Late Carboniferous-Early Permian In The Basin Of Craton In North China Block

The late Paleozoic is the only large-scale transition period from glacial period to interglacial period since the land has plants.This may be consistent with the current climate change.It is significance for us to predict the future climate that studying Paleozoic sedimentary records to obtain paleoclimate.A large number of coal measures strata deposits have been developed in the Late Paleozoic epicontinental basin in North China Block,It records information about climate conversion.This paper studies sea level changes and paleoclimate in the Western Shandong in eastern of North China,and compare with Russian platform,North American platform and South China.Get the conclusion as follows:(1)Using petrology,sequence stratigraphy and chronostratigraphy to analysis late Carboniferous-Early Permian strata in Western Shandong,so that the sequence stratigraphy can be analyzed.It divided two third-order sequence and obtained the law of sea level change,Combined zircon U-Pb isotope data establishment the framework of absolute age.(2)Take the mudstone to major element experiment and calculation indicating climate chemical index that include CIA,CIW,WIP,PIA.It indicated that the Western Shandong has the characteristics of hot and then warm after correct the results.Carbon isotope analysis of carbonate rocks indicated that Sea level rises first and then falls.(3)Comparing the ancient sea level and carbon isotope in the Western Shandong with other regions.It showed that the research area has a good relationship with other regions.Analyze local differences with sequence stratigraphy and chemical weathering indicators.It is concluded that the sediments in the Western Shandong are mainly controlled by global climate change and also affected by regional tectonic activities.