(Appendix A) Geochemistry of Oligocene sediments of ODP Site 177-1090, supplement to: Anderson, Linda Davis; Delaney, Margaret Lois (2005): Use of multiproxy records on the Agulhas Ridge, Southern Ocean (Ocean Drilling Project Leg 177, Site 1090) to investigate sub-Antarctic hydrography from the Oligocene to the early Miocene. Paleoceanography, 20(3), PA3011
Ocean Drilling Program (ODP) Site 1090, on the Agulhas Ridge in the South Atlantic sector of the Southern Ocean, is ideally located to capture changes in Southern Ocean circulation patterns. Using samples taken from cored sediments, we construct multiproxy records of productivity (biogenic barium (B...
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ftdatacite:10.1594/pangaea.838992 2023-05-15T14:05:25+02:00 (Appendix A) Geochemistry of Oligocene sediments of ODP Site 177-1090, supplement to: Anderson, Linda Davis; Delaney, Margaret Lois (2005): Use of multiproxy records on the Agulhas Ridge, Southern Ocean (Ocean Drilling Project Leg 177, Site 1090) to investigate sub-Antarctic hydrography from the Oligocene to the early Miocene. Paleoceanography, 20(3), PA3011 Anderson, Linda Davis Delaney, Margaret Lois 2005 text/tab-separated-values https://dx.doi.org/10.1594/pangaea.838992 https://doi.pangaea.de/10.1594/PANGAEA.838992 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://www.ncdc.noaa.gov/paleo/study/2628 https://dx.doi.org/10.1029/2004pa001082 https://www.ncdc.noaa.gov/paleo/study/2628 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Event label Sample code/label DEPTH, sediment/rock Depth, composite AGE Manganese Barium Uranium Titanium Aluminium Method comment Barium excess Calcium carbonate Opal, biogenic silica Velocity, shear, amplitude Phosphorus, reactive Phosphorus, detrital Phosphorus, total Accumulation rate, phosphorus Accumulation rate, barium, excess Accumulation rate, calcium carbonate Accumulation rate, opal Accumulation rate, terrigenous Drilling/drill rig DSDP/ODP/IODP sample designation Leg177 Joides Resolution Dataset dataset Supplementary Dataset 2005 ftdatacite https://doi.org/10.1594/pangaea.838992 https://doi.org/10.1029/2004pa001082 2022-02-09T13:17:41Z Ocean Drilling Program (ODP) Site 1090, on the Agulhas Ridge in the South Atlantic sector of the Southern Ocean, is ideally located to capture changes in Southern Ocean circulation patterns. Using samples taken from cored sediments, we construct multiproxy records of productivity (biogenic barium (Baex), opal, and CaCO3 mass accumulation rates (MARs)), nutrient and organic carbon burial (reactive phosphorus (Pr) MARs), and redox conditions (U and Mn enrichments) to investigate hydrographic conditions associated with climatic shifts from the Oligocene through the early Miocene. Orbitally induced cyclicity in U and Mn enrichments (100 kyr) suggests shifts in deepwater characteristics. However, CaCO3 dissolution coincident with low U and Mn enrichments does not indicate low-oxygen, corrosive waters similar to modern conditions. These observations indicate that a well-developed "modern-type" Antarctic Circumpolar Current (ACC) did not yet exist over the period from 30 to 20 Ma, with two potential consequences: The Southern Ocean was not functioning as a silica trap, permitting a broader distribution of silica that may have facilitated organic carbon burial in the ocean in general, and the lack of a deeply mixing ACC may have facilitated organic carbon burial in the Southern Ocean. Both the relative (high opal MARs coincident with low CaCO3 MARs) and absolute (high Pr MARs) burial of organic carbon suggest a powerful mechanism for pCO2 drawdown. Dataset Antarc* Antarctic Southern Ocean DataCite Metadata Store (German National Library of Science and Technology) Antarctic Southern Ocean |
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Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Event label Sample code/label DEPTH, sediment/rock Depth, composite AGE Manganese Barium Uranium Titanium Aluminium Method comment Barium excess Calcium carbonate Opal, biogenic silica Velocity, shear, amplitude Phosphorus, reactive Phosphorus, detrital Phosphorus, total Accumulation rate, phosphorus Accumulation rate, barium, excess Accumulation rate, calcium carbonate Accumulation rate, opal Accumulation rate, terrigenous Drilling/drill rig DSDP/ODP/IODP sample designation Leg177 Joides Resolution |
spellingShingle |
Event label Sample code/label DEPTH, sediment/rock Depth, composite AGE Manganese Barium Uranium Titanium Aluminium Method comment Barium excess Calcium carbonate Opal, biogenic silica Velocity, shear, amplitude Phosphorus, reactive Phosphorus, detrital Phosphorus, total Accumulation rate, phosphorus Accumulation rate, barium, excess Accumulation rate, calcium carbonate Accumulation rate, opal Accumulation rate, terrigenous Drilling/drill rig DSDP/ODP/IODP sample designation Leg177 Joides Resolution Anderson, Linda Davis Delaney, Margaret Lois (Appendix A) Geochemistry of Oligocene sediments of ODP Site 177-1090, supplement to: Anderson, Linda Davis; Delaney, Margaret Lois (2005): Use of multiproxy records on the Agulhas Ridge, Southern Ocean (Ocean Drilling Project Leg 177, Site 1090) to investigate sub-Antarctic hydrography from the Oligocene to the early Miocene. Paleoceanography, 20(3), PA3011 |
topic_facet |
Event label Sample code/label DEPTH, sediment/rock Depth, composite AGE Manganese Barium Uranium Titanium Aluminium Method comment Barium excess Calcium carbonate Opal, biogenic silica Velocity, shear, amplitude Phosphorus, reactive Phosphorus, detrital Phosphorus, total Accumulation rate, phosphorus Accumulation rate, barium, excess Accumulation rate, calcium carbonate Accumulation rate, opal Accumulation rate, terrigenous Drilling/drill rig DSDP/ODP/IODP sample designation Leg177 Joides Resolution |
description |
Ocean Drilling Program (ODP) Site 1090, on the Agulhas Ridge in the South Atlantic sector of the Southern Ocean, is ideally located to capture changes in Southern Ocean circulation patterns. Using samples taken from cored sediments, we construct multiproxy records of productivity (biogenic barium (Baex), opal, and CaCO3 mass accumulation rates (MARs)), nutrient and organic carbon burial (reactive phosphorus (Pr) MARs), and redox conditions (U and Mn enrichments) to investigate hydrographic conditions associated with climatic shifts from the Oligocene through the early Miocene. Orbitally induced cyclicity in U and Mn enrichments (100 kyr) suggests shifts in deepwater characteristics. However, CaCO3 dissolution coincident with low U and Mn enrichments does not indicate low-oxygen, corrosive waters similar to modern conditions. These observations indicate that a well-developed "modern-type" Antarctic Circumpolar Current (ACC) did not yet exist over the period from 30 to 20 Ma, with two potential consequences: The Southern Ocean was not functioning as a silica trap, permitting a broader distribution of silica that may have facilitated organic carbon burial in the ocean in general, and the lack of a deeply mixing ACC may have facilitated organic carbon burial in the Southern Ocean. Both the relative (high opal MARs coincident with low CaCO3 MARs) and absolute (high Pr MARs) burial of organic carbon suggest a powerful mechanism for pCO2 drawdown. |
format |
Dataset |
author |
Anderson, Linda Davis Delaney, Margaret Lois |
author_facet |
Anderson, Linda Davis Delaney, Margaret Lois |
author_sort |
Anderson, Linda Davis |
title |
(Appendix A) Geochemistry of Oligocene sediments of ODP Site 177-1090, supplement to: Anderson, Linda Davis; Delaney, Margaret Lois (2005): Use of multiproxy records on the Agulhas Ridge, Southern Ocean (Ocean Drilling Project Leg 177, Site 1090) to investigate sub-Antarctic hydrography from the Oligocene to the early Miocene. Paleoceanography, 20(3), PA3011 |
title_short |
(Appendix A) Geochemistry of Oligocene sediments of ODP Site 177-1090, supplement to: Anderson, Linda Davis; Delaney, Margaret Lois (2005): Use of multiproxy records on the Agulhas Ridge, Southern Ocean (Ocean Drilling Project Leg 177, Site 1090) to investigate sub-Antarctic hydrography from the Oligocene to the early Miocene. Paleoceanography, 20(3), PA3011 |
title_full |
(Appendix A) Geochemistry of Oligocene sediments of ODP Site 177-1090, supplement to: Anderson, Linda Davis; Delaney, Margaret Lois (2005): Use of multiproxy records on the Agulhas Ridge, Southern Ocean (Ocean Drilling Project Leg 177, Site 1090) to investigate sub-Antarctic hydrography from the Oligocene to the early Miocene. Paleoceanography, 20(3), PA3011 |
title_fullStr |
(Appendix A) Geochemistry of Oligocene sediments of ODP Site 177-1090, supplement to: Anderson, Linda Davis; Delaney, Margaret Lois (2005): Use of multiproxy records on the Agulhas Ridge, Southern Ocean (Ocean Drilling Project Leg 177, Site 1090) to investigate sub-Antarctic hydrography from the Oligocene to the early Miocene. Paleoceanography, 20(3), PA3011 |
title_full_unstemmed |
(Appendix A) Geochemistry of Oligocene sediments of ODP Site 177-1090, supplement to: Anderson, Linda Davis; Delaney, Margaret Lois (2005): Use of multiproxy records on the Agulhas Ridge, Southern Ocean (Ocean Drilling Project Leg 177, Site 1090) to investigate sub-Antarctic hydrography from the Oligocene to the early Miocene. Paleoceanography, 20(3), PA3011 |
title_sort |
(appendix a) geochemistry of oligocene sediments of odp site 177-1090, supplement to: anderson, linda davis; delaney, margaret lois (2005): use of multiproxy records on the agulhas ridge, southern ocean (ocean drilling project leg 177, site 1090) to investigate sub-antarctic hydrography from the oligocene to the early miocene. paleoceanography, 20(3), pa3011 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
2005 |
url |
https://dx.doi.org/10.1594/pangaea.838992 https://doi.pangaea.de/10.1594/PANGAEA.838992 |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_relation |
https://www.ncdc.noaa.gov/paleo/study/2628 https://dx.doi.org/10.1029/2004pa001082 https://www.ncdc.noaa.gov/paleo/study/2628 |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.838992 https://doi.org/10.1029/2004pa001082 |
_version_ |
1766277292723535872 |