Integrated biomagnetochronology for the Palaeogene of ODP Hole 647A: implications for correlating palaeoceanographic events from high to low latitudes

摘要: Lower Eocene to Oligocene microfossil-rich hemipelagic sediments in ODP Hole 647A, southern Labrador Sea, provide a strategic section for resolving the early history of high North Atlantic climates and ocean circulation, correlating with carbonate-poor lower Cenozoic Arctic Nordic seas. Our new, integrated palaeomagneto- multigroup biostratigraphy (63 dinoflagellate cyst, calcareous nannofossil, planktonic foraminifer diatom datums) significantly improves Site 647 chronostratigraphy provides framework future studies. This new age model, coupled provisional d18O analyses, greater confidence location significant ocean-climate events at this site, including Eocene-Oligocene transition Middle Climatic Optimum. Early hyperthermals may also be present near base section. Palaeomagnetic control is improved Eocene, but not Oligocene. Revised estimates sedimentation biogenic flux indicate changes supply preservation that climatically controlled. A hiatus more precisely constrained, c. 4 million year duration. Age depth errors quantify uncertainties throughout revised model will play an important role stratigraphic correlation between very latitude sites. © The Geological Society London 2013.