SEDIMENTARY ENVIRONMENTAL EVOLUTION OF NINGSHAO PLAIN SINCE LAST GLACIAL MAXIMUM

Abstract

The HMD Core(29°59.064′N、121°21.754′E) was collected near the Hemudu Civilization site at Ningshao Plain,the southern bank of Hangzhou Bay.The core is 45.3 m long with clay and silt as its main lithological components.The results of grain size,C/N ratio,organic carbon isotope(δ13CTOC) value and pollen analysis reveal the sedimentary environmental changes and paleoclimatic evolution stages in Ningshao Plain since LGM.It also shows that,the main organic source of HMD Core was from endogenous water plants,and the δ13CTOC values variation was mainly controlled by the change in atmospheric CO2 pressure.It is a good response to global climatic changes.