Orbital forcing and climate response at the Oligocene-Miocene boundary: stable isotope records from IODP site U1334

Helen Beddow, Department of Earth Sciences, Faculty of Geosciences, Utrecht University, Budapestlaan 4, 3584 CD, Utrecht, Netherlands, Alexander Harrison, University of Leeds, Leeds, United Kingdom, Appy Sluijs, Utrecht University, Utrecht, Netherlands, Bridget Wade, University College London, Department of Earth Sciences, London, United Kingdom, Diederik Liebrand, University of Southampton, National Oceanographic Centre, Southampton, United Kingdom and Lucas Joost Lourens, Department of Earth Sciences, Faculty of Geosciences, Utrecht University. Budapestlaan 4, 3584CD, Utrecht, Netherlands
Abstract:
An extreme, transient expansion of the Antarctic ice sheet at the Oligocene-Miocene boundary (the Mi-1 event) marks an important transition in Cenozoic climate. Here, we present new high-resolution benthic and planktic stable isotope records from IODP Site U1334, in the eastern equatorial Pacific Ocean. These newly generated records resolve the role of orbital forcing in late Oligocene – early Miocene climatic changes and reconstruct the evolution of surface to deep water gradients to improve our understanding of this pivotal boundary.
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