Pleistocene chronology of sediments from the Lomonosov Ridge, supplement to: O'Regan, Matthew; King, John W; Backman, Jan; Jakobsson, Martin; Pälike, Heiko; Moran, Kathryn; Heil, Chip; Sakamoto, Tatsuhiko; Cronin, Thomas M; Jordan, Richard William (2008): Constraints on the Pleistocene chronology of sediments from the Lomonosov Ridge. Paleoceanography, 23(1), PA1S19

• Main Authors: O'Regan, Matthew, King, John W, Backman, Jan, Jakobsson, Martin, Pälike, Heiko, Moran, Kathryn, Heil, Chip, Sakamoto, Tatsuhiko, Cronin, Thomas M, Jordan, Richard William
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2008
• Subjects: Integrated Ocean Drilling Program / International Ocean Discovery Program IODP; International Polar Year 2007-2008 IPY; Arctic; Arctic Ocean; International Polar Year; IPY; Lomonosov Ridge
• Online Access: https://dx.doi.org/10.1594/pangaea.832427; https://doi.pangaea.de/10.1594/PANGAEA.832427

Despite its importance in the global climate system, age-calibrated marine geologic records reflecting the evolution of glacial cycles through the Pleistocene are largely absent from the central Arctic Ocean. This is especially true for sediments older than 200 ka. Three sites cored during the Integrated Ocean Drilling Program's Expedition 302, the Arctic Coring Expedition (ACEX), provide a 27 m continuous sedimentary section from the Lomonosov Ridge in the central Arctic Ocean. Two key biostratigraphic datums and constraints from the magnetic inclination data are used to anchor the chronology of these sediments back to the base of the Cobb Mountain subchron (1215 ka). Beyond 1215 ka, two best fitting geomagnetic models are used to investigate the nature of cyclostratigraphic change. Within this chronology we show that bulk and mineral magnetic properties of the sediments vary on predicted Milankovitch frequencies. These cyclic variations record "glacial" and "interglacial" modes of sediment deposition on the Lomonosov Ridge as evident in studies of ice-rafted debris and stable isotopic and faunal assemblages for the last two glacial cycles and were used to tune the age model. Potential errors, which largely arise from uncertainties in the nature of downhole paleomagnetic variability, and the choice of a tuning target are handled by defining an error envelope that is based on the best fitting cyclostratigraphic and geomagnetic solutions. : Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150