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Stable carbon and oxygen isotopes were analyzed from Globigerina bulloides, Globoconella inflata, and Cibicidoides wuellerstorfi in upper Quaternary sediments from ODP Holes 861A through 861C. They are located in 1652 m water depth off the coast of southern Chile at 45°51 'S, 75°41.5'W. The correlation of the oxygen isotope curves with the SPECMAP stack reveals that the record of the uppermost 80 mbsf goes back to oxygen isotope Event 10.2, which is 341 k.y. before the present. Linear sedimentation rates show strong variations and are highest during Terminations I and II, and in the lithostratigraphic Subunit II, where debris flows and sand turbidites occur. Ice-rafted debris was only recorded in four distinct intervals that occur in glacial intervals. Discrepancies between sea-surface paleotemperatures as estimated from oxygen isotopes and occurrences of subtropical planktonic foraminifers reveal the sporadic influence of warm surface waters, driven southward to at least 46°S by El Nino at the end of Termination la. This warm-water influence is corroborated by silicoflagellate assemblages and by the history of the Cordilleran glaciers in southern Chile.

Late Quaternary Stable Isotope Record of Planktonic and Benthic Foraminifers: Site 861, Chile Triple Junction, Southeastern Pacific