(Table 1) Age markers and errors for the last 1215 ka in IODP Exp302 ...

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 Integ...

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Bibliographic Details
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: Dataset
Language:English
Published: PANGAEA 2010
Subjects:
DEPTH, sediment/rock
Age model
Datum level
Age, minimum/young
Age, maximum/old
Age, comment
Composite Core
see references
Calculated, see references
see comment
Exp302
CCGS Captain Molly Kool Vidar Viking
Integrated Ocean Drilling Program / International Ocean Discovery Program IODP
Arctic
Arctic Ocean
Greenland
Greenland Sea
Lomonosov Ridge
Online Access:https://dx.doi.org/10.1594/pangaea.733880
https://doi.pangaea.de/10.1594/PANGAEA.733880
Description
Summary: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 ... : 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. ...

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