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

Thursday, 18 December 2014
Helen Beddow1, Alexander Harrison2, Appy Sluijs1, Bridget Wade3, Diederik Liebrand4 and Lucas J. Lourens5, (1)Utrecht University, Utrecht, 3584, Netherlands, (2)University of Leeds, Leeds, United Kingdom, (3)University College London, London, United Kingdom, (4)University of Southampton, Southampton, United Kingdom, (5)Department of Earth Sciences, Faculty of Geosciences, Utrecht University. Budapestlaan 4, 3584CD, Utrecht, Netherlands
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.