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DETERMINATION OF 8180 OF SEAWATER IN THE DEEP OCEAN DURING THE LAST GLACIAL MAXIMUM D. P. Schrag and D. J. DePaolo Berkeley Center for Isotope Geochemistry

We present a method for determining the 8180 of seawater in the deep ocean during the last glacial maximum from the measured 8180 values of deep sea pore fluids. Using data from Deep Sea Drilling Project (DSDP) site 576 in the Western Pacific, this method yields a glacial to int~rglacial change in 8180swof 1.010.25%0. This value for ~8180sw is the first direct measurement of deep ocean 8180 for the last glacial maximum and avoids the problems of spatial and temporal variability of the 8180 of surface water implicit in previous determinations. More precise, higherresolution pore fluid measurements are required to improve this determination.