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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): Pleistocene chronology of sediments from the Lomonosov Ridge [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.832427, Supplement to: O'Regan, M et al. (2008): Constraints on the Pleistocene chronology of sediments from the Lomonosov Ridge. Paleoceanography, 23(1), PA1S19, https://doi.org/10.1029/2007PA001551

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Abstract:
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.
Project(s):
Integrated Ocean Drilling Program / International Ocean Discovery Program (IODP)
International Polar Year (2007-2008) (IPY)
Coverage:
Median Latitude: 87.897451 * Median Longitude: 138.010001 * South-bound Latitude: 87.890000 * West-bound Longitude: 137.650000 * North-bound Latitude: 87.933330 * East-bound Longitude: 139.535000
Date/Time Start: 2004-08-19T00:00:00 * Date/Time End: 2004-08-26T00:00:00
Comment:
Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
5 datasets

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Datasets listed in this publication series

  1. O'Regan, M; King, JW; Backman, J et al. (2008): (Table S3) Possible ties beyond 1215 ka in the faster sedimentation rate age model of IODP Exp302 composite core. https://doi.org/10.1594/PANGAEA.832426
  2. O'Regan, M; King, JW; Backman, J et al. (2008): (Table S3) Possible ties beyond 1215 ka in the slower sedimentation rate age model of IODP Exp302 composite core. https://doi.org/10.1594/PANGAEA.832425
  3. O'Regan, M; King, JW; Backman, J et al. (2008): (Table S1) Summary of elastic properties of sediments from lithologic Unit 1 of IODP Exp302 composite core. https://doi.org/10.1594/PANGAEA.832423
  4. O'Regan, M; King, JW; Backman, J et al. (2008): (Table S2) Stratigraphic correlation tie points between IODP Exp302 composite core, PS-2185-6 and 96/1-PC. https://doi.org/10.1594/PANGAEA.832424
  5. O'Regan, M; King, JW; Backman, J et al. (2010): (Table 1) Age markers and errors for the last 1215 ka in IODP Exp302. https://doi.org/10.1594/PANGAEA.733880