Sedimentology of ODP sites in the Cape Basin, southeast Atlantic Ocean, supplement to: Diester-Haass, Lieselotte; Meyers, Philip A; Bickert, Torsten (2004): Carbonate crash and biogenic bloom in the late Miocene: Evidence from ODP Sites 1085, 1086, and 1087 in the Cape Basin, southeast Atlantic Ocean. Paleoceanography, 19(1), PA1007
Middle/late Miocene to early Pliocene sedimentary sequences along the continental margin of southwest Africa have changes that correspond to the carbonate crash (12-9 Ma) and biogenic bloom events (~7-4 Ma) described in the equatorial Pacific by Farrell et al. (1995, doi:10.2973/odp.proc.sr.138.143....
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ftdatacite:10.1594/pangaea.737121 2023-05-15T17:25:28+02:00 Sedimentology of ODP sites in the Cape Basin, southeast Atlantic Ocean, supplement to: Diester-Haass, Lieselotte; Meyers, Philip A; Bickert, Torsten (2004): Carbonate crash and biogenic bloom in the late Miocene: Evidence from ODP Sites 1085, 1086, and 1087 in the Cape Basin, southeast Atlantic Ocean. Paleoceanography, 19(1), PA1007 Diester-Haass, Lieselotte Meyers, Philip A Bickert, Torsten 2004 application/zip https://dx.doi.org/10.1594/pangaea.737121 https://doi.pangaea.de/10.1594/PANGAEA.737121 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.1029/2003pa000933 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Composite Core Drilling/drill rig Leg175 Joides Resolution Ocean Drilling Program ODP Supplementary Collection of Datasets Collection article 2004 ftdatacite https://doi.org/10.1594/pangaea.737121 https://doi.org/10.1029/2003pa000933 2022-02-08T16:02:21Z Middle/late Miocene to early Pliocene sedimentary sequences along the continental margin of southwest Africa have changes that correspond to the carbonate crash (12-9 Ma) and biogenic bloom events (~7-4 Ma) described in the equatorial Pacific by Farrell et al. (1995, doi:10.2973/odp.proc.sr.138.143.1995). To explore the origins of these changes, we analyzed the carbon and coarse fraction contents of sediments from ODP Sites 1085, 1086, and 1087 at a time resolution of 5 to 30 kyr. Several major drops in CaCO3 concentration between 12 and 9 Ma are caused by dilution from major increases in clastic input from the Oranje River during global sea level regressions. Abundant pyrite crystals and good preservation of fish debris reflect low oxygenation of bottom/pore waters. Regional productivity was enhanced during the time equivalent to the carbonate crash period. Higher benthic/planktic foraminiferal ratios indicate that CaCO3 dissolution at Site 1085 peaked between 9 to 7 Ma, which was after the global carbonate crash. This period of enhanced dissolution suggests that Site 1085 was located within a low-oxygen water mass that dissolved CaCO3 more easily than North Atlantic Deep Water, which began to bathe this site at 7 Ma. At 7 to 6 Ma, the onset of the biogenic bloom, increases and variations in total organic carbon and benthic foraminiferal accumulation rates show that paleoproductivity increased significantly above values observed during the carbonate crash period and fluctuated widely. We attribute the late Miocene paleoproductivity increase off southwest Africa to ocean-wide increases in nutrient supply and delivery. Article in Journal/Newspaper North Atlantic Deep Water North Atlantic DataCite Metadata Store (German National Library of Science and Technology) Pacific |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Composite Core Drilling/drill rig Leg175 Joides Resolution Ocean Drilling Program ODP |
spellingShingle |
Composite Core Drilling/drill rig Leg175 Joides Resolution Ocean Drilling Program ODP Diester-Haass, Lieselotte Meyers, Philip A Bickert, Torsten Sedimentology of ODP sites in the Cape Basin, southeast Atlantic Ocean, supplement to: Diester-Haass, Lieselotte; Meyers, Philip A; Bickert, Torsten (2004): Carbonate crash and biogenic bloom in the late Miocene: Evidence from ODP Sites 1085, 1086, and 1087 in the Cape Basin, southeast Atlantic Ocean. Paleoceanography, 19(1), PA1007 |
topic_facet |
Composite Core Drilling/drill rig Leg175 Joides Resolution Ocean Drilling Program ODP |
description |
Middle/late Miocene to early Pliocene sedimentary sequences along the continental margin of southwest Africa have changes that correspond to the carbonate crash (12-9 Ma) and biogenic bloom events (~7-4 Ma) described in the equatorial Pacific by Farrell et al. (1995, doi:10.2973/odp.proc.sr.138.143.1995). To explore the origins of these changes, we analyzed the carbon and coarse fraction contents of sediments from ODP Sites 1085, 1086, and 1087 at a time resolution of 5 to 30 kyr. Several major drops in CaCO3 concentration between 12 and 9 Ma are caused by dilution from major increases in clastic input from the Oranje River during global sea level regressions. Abundant pyrite crystals and good preservation of fish debris reflect low oxygenation of bottom/pore waters. Regional productivity was enhanced during the time equivalent to the carbonate crash period. Higher benthic/planktic foraminiferal ratios indicate that CaCO3 dissolution at Site 1085 peaked between 9 to 7 Ma, which was after the global carbonate crash. This period of enhanced dissolution suggests that Site 1085 was located within a low-oxygen water mass that dissolved CaCO3 more easily than North Atlantic Deep Water, which began to bathe this site at 7 Ma. At 7 to 6 Ma, the onset of the biogenic bloom, increases and variations in total organic carbon and benthic foraminiferal accumulation rates show that paleoproductivity increased significantly above values observed during the carbonate crash period and fluctuated widely. We attribute the late Miocene paleoproductivity increase off southwest Africa to ocean-wide increases in nutrient supply and delivery. |
format |
Article in Journal/Newspaper |
author |
Diester-Haass, Lieselotte Meyers, Philip A Bickert, Torsten |
author_facet |
Diester-Haass, Lieselotte Meyers, Philip A Bickert, Torsten |
author_sort |
Diester-Haass, Lieselotte |
title |
Sedimentology of ODP sites in the Cape Basin, southeast Atlantic Ocean, supplement to: Diester-Haass, Lieselotte; Meyers, Philip A; Bickert, Torsten (2004): Carbonate crash and biogenic bloom in the late Miocene: Evidence from ODP Sites 1085, 1086, and 1087 in the Cape Basin, southeast Atlantic Ocean. Paleoceanography, 19(1), PA1007 |
title_short |
Sedimentology of ODP sites in the Cape Basin, southeast Atlantic Ocean, supplement to: Diester-Haass, Lieselotte; Meyers, Philip A; Bickert, Torsten (2004): Carbonate crash and biogenic bloom in the late Miocene: Evidence from ODP Sites 1085, 1086, and 1087 in the Cape Basin, southeast Atlantic Ocean. Paleoceanography, 19(1), PA1007 |
title_full |
Sedimentology of ODP sites in the Cape Basin, southeast Atlantic Ocean, supplement to: Diester-Haass, Lieselotte; Meyers, Philip A; Bickert, Torsten (2004): Carbonate crash and biogenic bloom in the late Miocene: Evidence from ODP Sites 1085, 1086, and 1087 in the Cape Basin, southeast Atlantic Ocean. Paleoceanography, 19(1), PA1007 |
title_fullStr |
Sedimentology of ODP sites in the Cape Basin, southeast Atlantic Ocean, supplement to: Diester-Haass, Lieselotte; Meyers, Philip A; Bickert, Torsten (2004): Carbonate crash and biogenic bloom in the late Miocene: Evidence from ODP Sites 1085, 1086, and 1087 in the Cape Basin, southeast Atlantic Ocean. Paleoceanography, 19(1), PA1007 |
title_full_unstemmed |
Sedimentology of ODP sites in the Cape Basin, southeast Atlantic Ocean, supplement to: Diester-Haass, Lieselotte; Meyers, Philip A; Bickert, Torsten (2004): Carbonate crash and biogenic bloom in the late Miocene: Evidence from ODP Sites 1085, 1086, and 1087 in the Cape Basin, southeast Atlantic Ocean. Paleoceanography, 19(1), PA1007 |
title_sort |
sedimentology of odp sites in the cape basin, southeast atlantic ocean, supplement to: diester-haass, lieselotte; meyers, philip a; bickert, torsten (2004): carbonate crash and biogenic bloom in the late miocene: evidence from odp sites 1085, 1086, and 1087 in the cape basin, southeast atlantic ocean. paleoceanography, 19(1), pa1007 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
2004 |
url |
https://dx.doi.org/10.1594/pangaea.737121 https://doi.pangaea.de/10.1594/PANGAEA.737121 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic Deep Water North Atlantic |
genre_facet |
North Atlantic Deep Water North Atlantic |
op_relation |
https://dx.doi.org/10.1029/2003pa000933 |
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.737121 https://doi.org/10.1029/2003pa000933 |
_version_ |
1766116906462347264 |