Late Quaternary clay mineralogy of ODP Site 177-1089 and core PS2821-1 in the Southern Cape Basin
During Leg 177 of the Ocean Drilling Program, an expanded sequence of Pliocene to Holocene calcareous muds was recovered at Site 1089 on a drift deposit in the southern Cape Basin (SE South Atlantic). The reconstruction of detrital sources and modes of sediment transport gives insight into the opera...
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Format: | Dataset |
Language: | English |
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PANGAEA
2002
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Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.706199 https://doi.org/10.1594/PANGAEA.706199 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.706199 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
177-1089A 177-1089B 177-1089C 177-1089D ANT-XIV/3 AWI_Paleo DRILL Drilling/drill rig Joides Resolution KL Leg177 Ocean Drilling Program ODP Paleoenvironmental Reconstructions from Marine Sediments @ AWI Piston corer (BGR type) Polarstern PS2821-1 PS43 PS43/057 South Atlantic Ocean Weddell Sea |
spellingShingle |
177-1089A 177-1089B 177-1089C 177-1089D ANT-XIV/3 AWI_Paleo DRILL Drilling/drill rig Joides Resolution KL Leg177 Ocean Drilling Program ODP Paleoenvironmental Reconstructions from Marine Sediments @ AWI Piston corer (BGR type) Polarstern PS2821-1 PS43 PS43/057 South Atlantic Ocean Weddell Sea Kuhn, Gerhard Diekmann, Bernhard Late Quaternary clay mineralogy of ODP Site 177-1089 and core PS2821-1 in the Southern Cape Basin |
topic_facet |
177-1089A 177-1089B 177-1089C 177-1089D ANT-XIV/3 AWI_Paleo DRILL Drilling/drill rig Joides Resolution KL Leg177 Ocean Drilling Program ODP Paleoenvironmental Reconstructions from Marine Sediments @ AWI Piston corer (BGR type) Polarstern PS2821-1 PS43 PS43/057 South Atlantic Ocean Weddell Sea |
description |
During Leg 177 of the Ocean Drilling Program, an expanded sequence of Pliocene to Holocene calcareous muds was recovered at Site 1089 on a drift deposit in the southern Cape Basin (SE South Atlantic). The reconstruction of detrital sources and modes of sediment transport gives insight into the operational modes of regional current systems in response to climate variability over the last 590kyr, as inferred from sedimentological and mineralogical parameters of the terrigenous sediment fraction. Terrigenous sediments mainly originate from African sources with minor contributions from distant southern sources (South America and Antarctica) and are supplied by circumpolar water masses, North Atlantic Deep Water (NADW), and surface currents of the Agulhas Current. Changes in clay mineralogy as tracers of deep and shallow ocean circulation, best displayed by variations in quartz/feldspar ratios and kaolinite/chlorite ratios of clay, reflect both the northward displacement of NADW injection into the Antarctic Circumpolar Current and a weakening of Agulhas Current leakage from the Indian Ocean around South Africa to the South Atlantic during glacial stages, sub-stages, and stadials. Modifications of these regional current patterns are consistent with perturbations in global conveyor circulation and climate variability on Milankovitch and sub-Milankovitch time scales. Elevated mass-accumulation rates of terrigenous matter generally document high particle fluxes and focusing effects by bottom-current action throughout the late Quaternary. Current sorting and coarsening of terrigenous mud, independently of its source signals, prevails during interglacial periods and is linked to a stronger flow of Antarctic Bottom Water and the invigoration of deep contour currents in response to long-term changes (100-kyr cyclicity) in Antarctic ice-sheet dynamics, high-amplitude fluctuations in global sea level, and increased bottomwater formation. |
format |
Dataset |
author |
Kuhn, Gerhard Diekmann, Bernhard |
author_facet |
Kuhn, Gerhard Diekmann, Bernhard |
author_sort |
Kuhn, Gerhard |
title |
Late Quaternary clay mineralogy of ODP Site 177-1089 and core PS2821-1 in the Southern Cape Basin |
title_short |
Late Quaternary clay mineralogy of ODP Site 177-1089 and core PS2821-1 in the Southern Cape Basin |
title_full |
Late Quaternary clay mineralogy of ODP Site 177-1089 and core PS2821-1 in the Southern Cape Basin |
title_fullStr |
Late Quaternary clay mineralogy of ODP Site 177-1089 and core PS2821-1 in the Southern Cape Basin |
title_full_unstemmed |
Late Quaternary clay mineralogy of ODP Site 177-1089 and core PS2821-1 in the Southern Cape Basin |
title_sort |
late quaternary clay mineralogy of odp site 177-1089 and core ps2821-1 in the southern cape basin |
publisher |
PANGAEA |
publishDate |
2002 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.706199 https://doi.org/10.1594/PANGAEA.706199 |
op_coverage |
MEDIAN LATITUDE: -40.940077 * MEDIAN LONGITUDE: 9.891198 * SOUTH-BOUND LATITUDE: -40.943830 * WEST-BOUND LONGITUDE: 9.888500 * NORTH-BOUND LATITUDE: -40.936100 * EAST-BOUND LONGITUDE: 9.894100 * DATE/TIME START: 1997-03-15T08:53:00 * DATE/TIME END: 1997-12-24T03:15:00 |
long_lat |
ENVELOPE(9.888500,9.894100,-40.936100,-40.943830) |
geographic |
Antarctic The Antarctic Weddell Sea Indian Weddell |
geographic_facet |
Antarctic The Antarctic Weddell Sea Indian Weddell |
genre |
Antarc* Antarctic Antarctica Ice Sheet NADW North Atlantic Deep Water North Atlantic South Atlantic Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet NADW North Atlantic Deep Water North Atlantic South Atlantic Ocean Weddell Sea |
op_source |
Supplement to: Kuhn, Gerhard; Diekmann, Bernhard (2002): Late Quaternary variability of ocean circulation in the southeastern South Atlantic inferred from the terrigenous sediment record of a drift deposit in the southern Cape Basin (ODP Site 1089). Palaeogeography, Palaeoclimatology, Palaeoecology, 182(3-4), 287-303, https://doi.org/10.1016/S0031-0182(01)00500-4 |
op_relation |
Kuhn, Gerhard; Diekmann, Bernhard (2003): Data report: Bulk sediment composition, grain-size, clay and silt mineralogy of Pleistocene sediments from ODP Leg 177 Sites 1089 and 1090. In: Gersonde, R; Hodell, DA; Blum, P (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 177, 1-10, https://doi.org/10.2973/odp.proc.sr.177.116.2003 https://doi.pangaea.de/10.1594/PANGAEA.706199 https://doi.org/10.1594/PANGAEA.706199 |
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.706199 https://doi.org/10.1016/S0031-0182(01)00500-4 https://doi.org/10.2973/odp.proc.sr.177.116.2003 |
_version_ |
1766163392048922624 |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.706199 2023-05-15T13:42:09+02:00 Late Quaternary clay mineralogy of ODP Site 177-1089 and core PS2821-1 in the Southern Cape Basin Kuhn, Gerhard Diekmann, Bernhard MEDIAN LATITUDE: -40.940077 * MEDIAN LONGITUDE: 9.891198 * SOUTH-BOUND LATITUDE: -40.943830 * WEST-BOUND LONGITUDE: 9.888500 * NORTH-BOUND LATITUDE: -40.936100 * EAST-BOUND LONGITUDE: 9.894100 * DATE/TIME START: 1997-03-15T08:53:00 * DATE/TIME END: 1997-12-24T03:15:00 2002-10-20 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.706199 https://doi.org/10.1594/PANGAEA.706199 en eng PANGAEA Kuhn, Gerhard; Diekmann, Bernhard (2003): Data report: Bulk sediment composition, grain-size, clay and silt mineralogy of Pleistocene sediments from ODP Leg 177 Sites 1089 and 1090. In: Gersonde, R; Hodell, DA; Blum, P (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 177, 1-10, https://doi.org/10.2973/odp.proc.sr.177.116.2003 https://doi.pangaea.de/10.1594/PANGAEA.706199 https://doi.org/10.1594/PANGAEA.706199 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Kuhn, Gerhard; Diekmann, Bernhard (2002): Late Quaternary variability of ocean circulation in the southeastern South Atlantic inferred from the terrigenous sediment record of a drift deposit in the southern Cape Basin (ODP Site 1089). Palaeogeography, Palaeoclimatology, Palaeoecology, 182(3-4), 287-303, https://doi.org/10.1016/S0031-0182(01)00500-4 177-1089A 177-1089B 177-1089C 177-1089D ANT-XIV/3 AWI_Paleo DRILL Drilling/drill rig Joides Resolution KL Leg177 Ocean Drilling Program ODP Paleoenvironmental Reconstructions from Marine Sediments @ AWI Piston corer (BGR type) Polarstern PS2821-1 PS43 PS43/057 South Atlantic Ocean Weddell Sea Dataset 2002 ftpangaea https://doi.org/10.1594/PANGAEA.706199 https://doi.org/10.1016/S0031-0182(01)00500-4 https://doi.org/10.2973/odp.proc.sr.177.116.2003 2023-01-20T07:31:14Z During Leg 177 of the Ocean Drilling Program, an expanded sequence of Pliocene to Holocene calcareous muds was recovered at Site 1089 on a drift deposit in the southern Cape Basin (SE South Atlantic). The reconstruction of detrital sources and modes of sediment transport gives insight into the operational modes of regional current systems in response to climate variability over the last 590kyr, as inferred from sedimentological and mineralogical parameters of the terrigenous sediment fraction. Terrigenous sediments mainly originate from African sources with minor contributions from distant southern sources (South America and Antarctica) and are supplied by circumpolar water masses, North Atlantic Deep Water (NADW), and surface currents of the Agulhas Current. Changes in clay mineralogy as tracers of deep and shallow ocean circulation, best displayed by variations in quartz/feldspar ratios and kaolinite/chlorite ratios of clay, reflect both the northward displacement of NADW injection into the Antarctic Circumpolar Current and a weakening of Agulhas Current leakage from the Indian Ocean around South Africa to the South Atlantic during glacial stages, sub-stages, and stadials. Modifications of these regional current patterns are consistent with perturbations in global conveyor circulation and climate variability on Milankovitch and sub-Milankovitch time scales. Elevated mass-accumulation rates of terrigenous matter generally document high particle fluxes and focusing effects by bottom-current action throughout the late Quaternary. Current sorting and coarsening of terrigenous mud, independently of its source signals, prevails during interglacial periods and is linked to a stronger flow of Antarctic Bottom Water and the invigoration of deep contour currents in response to long-term changes (100-kyr cyclicity) in Antarctic ice-sheet dynamics, high-amplitude fluctuations in global sea level, and increased bottomwater formation. Dataset Antarc* Antarctic Antarctica Ice Sheet NADW North Atlantic Deep Water North Atlantic South Atlantic Ocean Weddell Sea PANGAEA - Data Publisher for Earth & Environmental Science Antarctic The Antarctic Weddell Sea Indian Weddell ENVELOPE(9.888500,9.894100,-40.936100,-40.943830) |