Late Quaternary Sporopollen Assemblages And Sedimentary Environment In The Coastal Plain Of Southeast Ningbo

The quaternary sediments in the coastal plain area belong to the land-sea interaction deposition,and a good record of paleoclimate change is recorded,which is a better region to study the changes of paleoclimate and the sedimentary characteristics.Quaternary sediments not only record geological environment evolution information,but also have close relationship with human productive life.Due to the wide distribution of quaternary sediments in the coastal plain,the composition of sediments and lithofacies can provide basis for the construction of infrastructure.Therefore,the study of the paleoclimate and sedimentary environment in the southeast coastal plain of Ningbo,it can be used to predict the future climate change in the region,and also to provide reference for human production and life.Z02 Drilling is located in the coastal plain of southeastern Ningbo,which is used as a standard feature for ¹⁴C,OSL,geomagnetic survey year,with Sporopollen as the main,foraminifera,ostracods,particle size and other environmental alternatives to analyze the paleoclimate,paleo-vegetation and paleo-environmental information in the region.Through the characteristics of the project construction drilling and data collection,combined with chronology,rock stratigraphy,biological stratigraphy,climate stratigraphy and other comprehensive analysis to determine the stratigraphic division of the borehole sediments.Based on the chronology,the changes of paleo-vegetation in the late Quaternary were determined by the information reflected in the spore-pollen combination zone.On the basis of the chronology,the climatic changes in the late Quaternary of drilling area were determined by spore-pollen analysis and compared with the oxygen isotope in the deep sea,the regional climate change was found not only affected by global climate change,but also had regional characteristics.The changes of sedimentary environment in the late Quaternary of drilling area were analyzed by the chronology and granularity parameters,Foraminifera,ostracods and lithology characteristics,which showed that the late Pleistocene belonged to Continental and the Holocene belonged to Marine.To sum up,the article has restored to some extent the information of paleoclimate and paleoenvironment in the characteristic drilling area of the southeast coastal plain of Ningbo.The preparation of spore-pollen map,particle size parameter diagram,micro-body paleontology distribution map,sedimentary stratigraphic Division map,compre-hensive stratigraphic analysis diagram and so on will provide reference for future research.