International Ocean Discovery Program (IODP) Expedition 369, recovered pelagic sediments spanning the Albian to Pleistocene at Sites U1513, U1514 and U1516. The cores provide an opportunity to determine paleo-climatic and -oceanographic dynamics from a hitherto poorly sampled mid-high latitude location across an ~110 million year long interval, beginning during the Cretaceous super-greenhouse when eastern Gondwana was still largely assembled and ending during the modern icehouse climate after the final break-up of Gondwana. Here we present ~650 bulk carbonate carbon and oxygen stable isotope datapoints and plot them alongside shipboard datasets to present a first broad documentation of chemostratigraphic data that reveal the stratigraphic position of key climatic transitions and events at Sites U1513, U1514 and U1516. These records show a pronounced long-term d13C decrease and d18O increase from the Albian/Cenomanian through to the Pleistocene. Superimposed on this long-term trend are transient d13C and d18O events correlated with Ocean Anoxic Event 2, peak Cretaceous warmth during the Turonian, Santonian to Maastrichtian cooling, Cretaceous-Paleogene boundary, the Paleocene-Eocene Thermal Maximum (PETM), the early Eocene Climatic Optimum, middle Eocene Climatic Optimum, and the Eocene-Oligocene transition. Recognizing these isotopic events confirms and refines shipboard interpretations and, more importantly, demonstrate the suitability of Sites U1513, U1514, and U1516 for future high-resolution paleoceanographic works aimed at illuminating the links between tectonic and oceanographic dynamics and global versus local environmental changes.
|Number of pages
|Proceedings of the International Ocean Discovery Program
|Published - 20 May 2022