Revised age calibrations for the Eocene/Oligocene boundary of ODP Site 199-1218
The ocean depth at which the rate of calcium carbonate input from surface waters equals the rate of dissolution is termed the calcite compensation depth. At present, this depth is ~4,500 m, with some variation between and within ocean basins. The calcite compensation depth is linked to ocean acidity...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.769838 2023-05-15T13:55:14+02:00 Revised age calibrations for the Eocene/Oligocene boundary of ODP Site 199-1218 Coxall, Helen Wilson, Paul A Pälike, Heiko Lear, Caroline H Backman, Jan LATITUDE: 8.889630 * LONGITUDE: -135.366660 * DATE/TIME START: 2001-11-14T00:00:00 * DATE/TIME END: 2001-11-14T00:00:00 * MINIMUM DEPTH, sediment/rock: 204.67 m * MAXIMUM DEPTH, sediment/rock: 244.57 m 2005-09-14 text/tab-separated-values, 20 data points https://doi.pangaea.de/10.1594/PANGAEA.769838 https://doi.org/10.1594/PANGAEA.769838 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.769838 https://doi.org/10.1594/PANGAEA.769838 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Coxall, Helen; Wilson, Paul A; Pälike, Heiko; Lear, Caroline H; Backman, Jan (2005): Rapid stepwise onset of Antarctic glaciation and deeper calcite compensation in the Pacific Ocean. Nature, 433, 53-57, https://doi.org/10.1038/nature03135 199-1218 Age error Age model optional COMPCORE Composite Core Datum level DEPTH sediment/rock Joides Resolution Leg199 North Pacific Ocean Ocean Drilling Program ODP Dataset 2005 ftpangaea https://doi.org/10.1594/PANGAEA.769838 https://doi.org/10.1038/nature03135 2023-01-20T08:52:40Z The ocean depth at which the rate of calcium carbonate input from surface waters equals the rate of dissolution is termed the calcite compensation depth. At present, this depth is ~4,500 m, with some variation between and within ocean basins. The calcite compensation depth is linked to ocean acidity, which is in turn linked to atmospheric carbon dioxide concentrations and hence global climate (Broecker and Peng, 1987). Geological records of changes in the calcite compensation depth show a prominent deepening of more than 1 km near the Eocene/Oligocene boundary (~34 million years ago) (van Andel, 1975, doi:10.1016/0012-821X(75)90086-2) when significant permanent ice sheets first appeared on Antarctica (Kennett and Shackleton, 1976, doi:10.1038/260513a0; Miller et al., 1991, doi:10.1029/90JB02015; Zachos et al., 1996, doi:10.1029/96PA00571; Lear et al., 2000, doi:10.1126/science.287.5451.269), but the relationship between these two events is poorly understood. Here we present ocean sediment records of calcium carbonate content as well as carbon and oxygen isotopic compositions from the tropical Pacific Ocean that cover the Eocene/Oligocene boundary. We find that the deepening of the calcite compensation depth was more rapid than previously documented and occurred in two jumps of about 40,000 years each, synchronous with the stepwise onset of Antarctic ice-sheet growth. The glaciation was initiated, after climatic preconditioning (DeConto and Pollard, 2003, doi:10.1038/nature01290), by an interval when the Earth's orbit of the Sun favoured cool summers. The changes in oxygen-isotope composition across the Eocene/Oligocene boundary are too large to be explained by Antarctic ice-sheet growth alone and must therefore also indicate contemporaneous global cooling and/or Northern Hemisphere glaciation. Dataset Antarc* Antarctic Antarctica Ice Sheet PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Shackleton Pacific Pollard ENVELOPE(64.617,64.617,-70.467,-70.467) Kennett ENVELOPE(-65.167,-65.167,-67.117,-67.117) ENVELOPE(-135.366660,-135.366660,8.889630,8.889630) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
199-1218 Age error Age model optional COMPCORE Composite Core Datum level DEPTH sediment/rock Joides Resolution Leg199 North Pacific Ocean Ocean Drilling Program ODP |
spellingShingle |
199-1218 Age error Age model optional COMPCORE Composite Core Datum level DEPTH sediment/rock Joides Resolution Leg199 North Pacific Ocean Ocean Drilling Program ODP Coxall, Helen Wilson, Paul A Pälike, Heiko Lear, Caroline H Backman, Jan Revised age calibrations for the Eocene/Oligocene boundary of ODP Site 199-1218 |
topic_facet |
199-1218 Age error Age model optional COMPCORE Composite Core Datum level DEPTH sediment/rock Joides Resolution Leg199 North Pacific Ocean Ocean Drilling Program ODP |
description |
The ocean depth at which the rate of calcium carbonate input from surface waters equals the rate of dissolution is termed the calcite compensation depth. At present, this depth is ~4,500 m, with some variation between and within ocean basins. The calcite compensation depth is linked to ocean acidity, which is in turn linked to atmospheric carbon dioxide concentrations and hence global climate (Broecker and Peng, 1987). Geological records of changes in the calcite compensation depth show a prominent deepening of more than 1 km near the Eocene/Oligocene boundary (~34 million years ago) (van Andel, 1975, doi:10.1016/0012-821X(75)90086-2) when significant permanent ice sheets first appeared on Antarctica (Kennett and Shackleton, 1976, doi:10.1038/260513a0; Miller et al., 1991, doi:10.1029/90JB02015; Zachos et al., 1996, doi:10.1029/96PA00571; Lear et al., 2000, doi:10.1126/science.287.5451.269), but the relationship between these two events is poorly understood. Here we present ocean sediment records of calcium carbonate content as well as carbon and oxygen isotopic compositions from the tropical Pacific Ocean that cover the Eocene/Oligocene boundary. We find that the deepening of the calcite compensation depth was more rapid than previously documented and occurred in two jumps of about 40,000 years each, synchronous with the stepwise onset of Antarctic ice-sheet growth. The glaciation was initiated, after climatic preconditioning (DeConto and Pollard, 2003, doi:10.1038/nature01290), by an interval when the Earth's orbit of the Sun favoured cool summers. The changes in oxygen-isotope composition across the Eocene/Oligocene boundary are too large to be explained by Antarctic ice-sheet growth alone and must therefore also indicate contemporaneous global cooling and/or Northern Hemisphere glaciation. |
format |
Dataset |
author |
Coxall, Helen Wilson, Paul A Pälike, Heiko Lear, Caroline H Backman, Jan |
author_facet |
Coxall, Helen Wilson, Paul A Pälike, Heiko Lear, Caroline H Backman, Jan |
author_sort |
Coxall, Helen |
title |
Revised age calibrations for the Eocene/Oligocene boundary of ODP Site 199-1218 |
title_short |
Revised age calibrations for the Eocene/Oligocene boundary of ODP Site 199-1218 |
title_full |
Revised age calibrations for the Eocene/Oligocene boundary of ODP Site 199-1218 |
title_fullStr |
Revised age calibrations for the Eocene/Oligocene boundary of ODP Site 199-1218 |
title_full_unstemmed |
Revised age calibrations for the Eocene/Oligocene boundary of ODP Site 199-1218 |
title_sort |
revised age calibrations for the eocene/oligocene boundary of odp site 199-1218 |
publisher |
PANGAEA |
publishDate |
2005 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.769838 https://doi.org/10.1594/PANGAEA.769838 |
op_coverage |
LATITUDE: 8.889630 * LONGITUDE: -135.366660 * DATE/TIME START: 2001-11-14T00:00:00 * DATE/TIME END: 2001-11-14T00:00:00 * MINIMUM DEPTH, sediment/rock: 204.67 m * MAXIMUM DEPTH, sediment/rock: 244.57 m |
long_lat |
ENVELOPE(64.617,64.617,-70.467,-70.467) ENVELOPE(-65.167,-65.167,-67.117,-67.117) ENVELOPE(-135.366660,-135.366660,8.889630,8.889630) |
geographic |
Antarctic Shackleton Pacific Pollard Kennett |
geographic_facet |
Antarctic Shackleton Pacific Pollard Kennett |
genre |
Antarc* Antarctic Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet |
op_source |
Supplement to: Coxall, Helen; Wilson, Paul A; Pälike, Heiko; Lear, Caroline H; Backman, Jan (2005): Rapid stepwise onset of Antarctic glaciation and deeper calcite compensation in the Pacific Ocean. Nature, 433, 53-57, https://doi.org/10.1038/nature03135 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.769838 https://doi.org/10.1594/PANGAEA.769838 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.769838 https://doi.org/10.1038/nature03135 |
_version_ |
1766261551259451392 |