(Table 1) Age markers and errors for the last 1215 ka in IODP Exp302
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| Sprache: | en |
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PANGAEA
2010
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| author | O'Regan, Matthew King, John W Backman, Jan Jakobsson, Martin Pälike, Heiko Moran, Kathryn Heil, Chip Sakamoto, Tatsuhiko Cronin, Thomas M Jordan, Richard William |
| author_facet | O'Regan, Matthew King, John W Backman, Jan Jakobsson, Martin Pälike, Heiko Moran, Kathryn Heil, Chip Sakamoto, Tatsuhiko Cronin, Thomas M Jordan, Richard William |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_733880 |
| institution | PANGAEA |
| language | en |
| publishDate | 2010 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 1) Age markers and errors for the last 1215 ka in IODP Exp302 O'Regan, Matthew King, John W Backman, Jan Jakobsson, Martin Pälike, Heiko Moran, Kathryn Heil, Chip Sakamoto, Tatsuhiko Cronin, Thomas M Jordan, Richard William 302-CompSite; ACEX; Age, comment; Age, maximum/old; Age, minimum/young; Age model; Arctic Coring Expedition, ACEX; Calculated, see reference(s); CCGS Captain Molly Kool (Vidar Viking); COMPCORE; Composite Core; Datum level; DEPTH, sediment/rock; Exp302; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; see comment; see reference(s) 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. |
| title | (Table 1) Age markers and errors for the last 1215 ka in IODP Exp302 |
| topic | 302-CompSite; ACEX; Age, comment; Age, maximum/old; Age, minimum/young; Age model; Arctic Coring Expedition, ACEX; Calculated, see reference(s); CCGS Captain Molly Kool (Vidar Viking); COMPCORE; Composite Core; Datum level; DEPTH, sediment/rock; Exp302; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; see comment; see reference(s) |
| url | https://doi.org/10.1594/PANGAEA.733880 |