(Appendix A) Geochemistry of Oligocene sediments of ODP Site 177-1090
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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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.838992 2023-05-15T14:03:04+02:00 (Appendix A) Geochemistry of Oligocene sediments of ODP Site 177-1090 Anderson, Linda Davis Delaney, Margaret Lois MEDIAN LATITUDE: -42.913650 * MEDIAN LONGITUDE: 8.899850 * SOUTH-BOUND LATITUDE: -42.913700 * WEST-BOUND LONGITUDE: 8.899700 * NORTH-BOUND LATITUDE: -42.913600 * EAST-BOUND LONGITUDE: 8.900000 * DATE/TIME START: 1997-12-26T15:22:00 * DATE/TIME END: 1997-12-30T00:55:00 * MINIMUM DEPTH, sediment/rock: 102.65 m * MAXIMUM DEPTH, sediment/rock: 213.78 m 2005-11-18 text/tab-separated-values, 5249 data points https://doi.pangaea.de/10.1594/PANGAEA.838992 https://doi.org/10.1594/PANGAEA.838992 en eng PANGAEA Anderson, Linda Davis; Delaney, Margaret Lois (2005): NOAA/WDS Paleoclimatology - Southern Ocean Oligocene to early Miocene Paleoceanographic Data. NOAA National Centers for Environmental Information, https://doi.org/10.25921/D3SR-9W31 https://doi.pangaea.de/10.1594/PANGAEA.838992 https://doi.org/10.1594/PANGAEA.838992 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY 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, https://doi.org/10.1029/2004PA001082 177-1090B 177-1090D Accumulation rate barium excess calcium carbonate opal phosphorus terrigenous AGE Aluminium Barium excess Depth composite sediment/rock DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Event label Joides Resolution Leg177 Manganese Method comment biogenic silica detrital reactive total Sample code/label South Atlantic Ocean Titanium Uranium Velocity shear amplitude Dataset 2005 ftpangaea https://doi.org/10.1594/PANGAEA.838992 https://doi.org/10.1029/2004PA001082 https://doi.org/10.25921/D3SR-9W31 2023-01-20T09:04:38Z 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 South Atlantic Ocean Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Southern Ocean ENVELOPE(8.899700,8.900000,-42.913600,-42.913700) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
177-1090B 177-1090D Accumulation rate barium excess calcium carbonate opal phosphorus terrigenous AGE Aluminium Barium excess Depth composite sediment/rock DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Event label Joides Resolution Leg177 Manganese Method comment biogenic silica detrital reactive total Sample code/label South Atlantic Ocean Titanium Uranium Velocity shear amplitude |
spellingShingle |
177-1090B 177-1090D Accumulation rate barium excess calcium carbonate opal phosphorus terrigenous AGE Aluminium Barium excess Depth composite sediment/rock DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Event label Joides Resolution Leg177 Manganese Method comment biogenic silica detrital reactive total Sample code/label South Atlantic Ocean Titanium Uranium Velocity shear amplitude Anderson, Linda Davis Delaney, Margaret Lois (Appendix A) Geochemistry of Oligocene sediments of ODP Site 177-1090 |
topic_facet |
177-1090B 177-1090D Accumulation rate barium excess calcium carbonate opal phosphorus terrigenous AGE Aluminium Barium excess Depth composite sediment/rock DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Event label Joides Resolution Leg177 Manganese Method comment biogenic silica detrital reactive total Sample code/label South Atlantic Ocean Titanium Uranium Velocity shear amplitude |
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 |
title_short |
(Appendix A) Geochemistry of Oligocene sediments of ODP Site 177-1090 |
title_full |
(Appendix A) Geochemistry of Oligocene sediments of ODP Site 177-1090 |
title_fullStr |
(Appendix A) Geochemistry of Oligocene sediments of ODP Site 177-1090 |
title_full_unstemmed |
(Appendix A) Geochemistry of Oligocene sediments of ODP Site 177-1090 |
title_sort |
(appendix a) geochemistry of oligocene sediments of odp site 177-1090 |
publisher |
PANGAEA |
publishDate |
2005 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.838992 https://doi.org/10.1594/PANGAEA.838992 |
op_coverage |
MEDIAN LATITUDE: -42.913650 * MEDIAN LONGITUDE: 8.899850 * SOUTH-BOUND LATITUDE: -42.913700 * WEST-BOUND LONGITUDE: 8.899700 * NORTH-BOUND LATITUDE: -42.913600 * EAST-BOUND LONGITUDE: 8.900000 * DATE/TIME START: 1997-12-26T15:22:00 * DATE/TIME END: 1997-12-30T00:55:00 * MINIMUM DEPTH, sediment/rock: 102.65 m * MAXIMUM DEPTH, sediment/rock: 213.78 m |
long_lat |
ENVELOPE(8.899700,8.900000,-42.913600,-42.913700) |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic South Atlantic Ocean Southern Ocean |
genre_facet |
Antarc* Antarctic South Atlantic Ocean Southern Ocean |
op_source |
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, https://doi.org/10.1029/2004PA001082 |
op_relation |
Anderson, Linda Davis; Delaney, Margaret Lois (2005): NOAA/WDS Paleoclimatology - Southern Ocean Oligocene to early Miocene Paleoceanographic Data. NOAA National Centers for Environmental Information, https://doi.org/10.25921/D3SR-9W31 https://doi.pangaea.de/10.1594/PANGAEA.838992 https://doi.org/10.1594/PANGAEA.838992 |
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.838992 https://doi.org/10.1029/2004PA001082 https://doi.org/10.25921/D3SR-9W31 |
_version_ |
1766273560562630656 |