Paleogene oxygen isotope record for Deep Sea Drilling Sites 511 and 512, subantarctic South Atlantic Ocean: paleotemperatures, paleoceanographic changes, and the Eocene/ Oligocene boundary event.

Abstract

An Eocene-Oligocene oxygen and carbon isotope history based on planktonic and benthic foraminifers from Leg 71 cores has been constructed for the Maurice Ewing Bank. The cores cover portions of the middle Eocene, upper Eocene, and lower Oligocene. Surface water isotopic temperatures postulated for the middle Eocene at Site 512 fluctuated within about four degrees but generally averaged about 9oC. Bottom isotopic temperatures at Site 512 (water depth, 1846 m) were generally a degree lower than surface water temperatures. -from Authors