Water Salinity Fluctuations in Historical Period Reflected by the Change of Trace Elements in Bore YA in Pudong,Shanghai

The analys is of the change of trace element content in the upper part of Bore-YA indicat es that the content of B and the ratio of B/Ga,Sr/Ba and Cl/Br are sensitive in dicators of paleo-water salinity.The Bore-YA palaeo-salinity index curve shows,several one-hundred-scale salinity fluctuations occurred in this a rea in the last several thousand years,and they are probably relevant to sea-water inundations and recessions resulted from concurrent sea-level fluctuations.The fact indicates that trace elements in sedimental strata in the coastal area are good proxy for conventional sea-level changing indicators.