A 6000 YEAR MULTI-PROXY PALEOCLIMATE RECORD FROM A COASTAL POND AND BLUE HOLE ON THE ISLAND OF ELEUTHERA, BAHAMAS
High resolution XRF scans of Ca, Br, Fe and Sr as well as loss on ignition show a marked change around 3700 cal yBP that correlates with the top of a peat layer in Shad Pond and potential rapid sea level rise. This is followed by a period of high variability from 3700 yBP until approximately 2000 yBP possibly representing wet/dry cycles. This is corroborated by the ∂18O record recovered from ostracode shells as well as their trace element Mg:Ca and Sr:Ca ratios. The ∂18O records show an overall depletion from +1.47 ppm to -2.04 ppm (VPDB) throughout the 6000 year record, with highest variability between the 4000-3000 yBP period. Trace element analyses reveal a Mg:Ca and Sr:Ca record that positively co-varies and trends with the ∂18O record. Evidence for a meteoric lens collapse at 1.6-1.8 ka as sea-level rise breached a local sill and altered coastal circulation in Shad Pond is also apparent. Despite the differences in lake type (i.e. coastal lagoon vs. blue hole), the records from these two lakes show similar paleoclimatic trends. These multi-proxy records correspond to other patterns seen regionally in the Caribbean as well as globally.