Cenozoic and Upper Cretaceous bulk carbonate stable carbon and oxygen isotopes from IODP Sites U1513, U1514 and U1516, Expedition 369 in the southeast Indian Ocean

Kirsty Edgar, Kenneth G. MacLeod, Takashi Hasegawa, Emma Hanson, Ian Boomer, Nicola Kirby

Research output: Contribution to journalArticlepeer-review

Abstract

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.
Original languageEnglish
JournalProceedings of the International Ocean Discovery Program
Publication statusAccepted/In press - 22 Feb 2022

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Not yet published as of 09/05/2022.

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