O'Regan, Matthew; King, John W; Backman, Jan; Jakobsson, Martin; Pälike, Heiko; Moran, Kathryn; Heil, Chip; Sakamoto, Tatsuhiko; Cronin, Thomas M; Jordan, Richard William (2010): (Table 1) Age markers and errors for the last 1215 ka in IODP Exp302 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.733880, In 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.
Further details:
Cronin, Thomas M; Smith, Shannon A; Eynaud, Frédérique; O'Regan, Matthew; King, John W (2008): Quaternary paleoceanography of the central Arctic based on Integrated Ocean Drilling Program Arctic Coring Expedition 302 foraminiferal assemblages. Paleoceanography, 23(1), PA1S18, https://doi.org/10.1029/2007PA001484
Lund, Steven P; Stoner, Joseph S; Channell, James E T; Acton, Gary D (2006): A summary of Brunhes paleomagnetic field variability recorded in Ocean Drilling Program cores. Physics of The Earth and Planetary Interiors, 156(3-4), 194-204, https://doi.org/10.1016/j.pepi.2005.10.009
Martinson, Douglas G; Pisias, Nicklas G; Hays, James D; Imbrie, John D; Moore, Theodore C; Shackleton, Nicholas J (1987): Age Dating and the orbital theory of the ice ages: development of a high-resolution 0 to 300,000-year chronostratigraphy. Quaternary Research, 27, 1-29, https://doi.org/10.1016/0033-5894(87)90046-9
Nowaczyk, Norbert R; Frederichs, Thomas (1999): Geomagnetic events and relative palaeointensity variations during the past 300 ka as recorded in Kolbeinsey Ridge sediments, Iceland Sea: indication for a strongly variable geomagnetic field. International Journal of Earth Sciences, 88(1), 116-131, https://doi.org/10.1007/s005310050250
Project(s):
Coverage:
Latitude: 87.890000 * Longitude: 137.650000
Minimum DEPTH, sediment/rock: 0.00 m * Maximum DEPTH, sediment/rock: 16.23 m
Event(s):
302-CompSite * Latitude: 87.890000 * Longitude: 137.650000 * Elevation: -1251.0 m * Campaign: Exp302 (Arctic Coring Expedition, ACEX) * Basis: CCGS Captain Molly Kool (Vidar Viking) * Method/Device: Composite Core (COMPCORE) * Comment: Virtual core composed of spliced cores from Holes M0002A, M0003A, M0004A and M0004C. Virtual position and water depth is calculated as the mean of all Exp302 sites.
Comment:
Depths are given in revised meters composite depth (rmcd) with the best estimate for the age provided in the second column. The type of marker that was used to derive the age estimate is given in the third column; SC is stratigraphic correlation to cores 96/12-1PC and PS2185-6; NGS is Norwegian-Greenland Sea. Minimum and maximum age estimates are provided with both the method of determination and the source of the error estimate where applicable.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 2 | Age model | Age model | ka | O'Regan, Matthew | see reference(s) | |
| 3 | Datum level | DL | O'Regan, Matthew | |||
| 4 | Age, minimum/young | Age min | ka | O'Regan, Matthew | Calculated, see reference(s) | |
| 5 | Age, maximum/old | Age max | ka | O'Regan, Matthew | Calculated, see reference(s) | |
| 6 | Age, comment | Comm | O'Regan, Matthew | see comment |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
124 data points