Arctic chronology report

Abstract

Our major goal improving the chronostratigraphic framework for ODP site 910 and 911 from the marginal Arctic Ocean was successfully achieved. We have agreed on a new age model for both sites. We do not see any evidence for a hiatus in the sections. The collection of new high-resolution seismic data across the Yermak Plateau allows a perfect correlation between the sites. Both the new biostratigraphic and paleomagnetic data support the inferences from seismic correlation that the base of Hole 911A is slightly younger (~5.3 Ma) than Hole 910C (~5.8 Ma) (Fig. 1.1). The new data indicate that the base of the boreholes is approximately 2.5 Ma older than previously assigned (see ODP Leg 151 Scientific\/Initial Reports) (Fig. 1.2). All available old\/new age fixpoints for both boreholes are summarized in Table 1.1.