Sedimentological, geochemical, micropaleontological and rock magnetic proxies of sediment core GeoB6211-2
Surface currents and sediment distribution of the SE South American upper continental margin are under influence of the South American Monsoon System (SAMS) and the Southern Westerly Wind Belt (SWWB). Both climatic systems determine the meridional position of the Subtropical Shelf Front (STSF) and p...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.805136 2024-09-15T17:43:15+00:00 Sedimentological, geochemical, micropaleontological and rock magnetic proxies of sediment core GeoB6211-2 Razik, Sebastian Chiessi, Cristiano Mazur Romero, Oscar E von Dobeneck, Tilo LATITUDE: -32.505200 * LONGITUDE: -50.242700 * DATE/TIME START: 1999-12-12T17:21:00 * DATE/TIME END: 1999-12-12T17:21:00 2013 application/zip, 12 datasets https://doi.pangaea.de/10.1594/PANGAEA.805136 https://doi.org/10.1594/PANGAEA.805136 en eng PANGAEA Müller, Peter J (2004): Carbon and nitrogen data of sediment core GeoB6211-2 [dataset]. Department of Geosciences, Bremen University, PANGAEA, https://doi.org/10.1594/PANGAEA.137054 Müller, Peter J (2004): Density and water content of sediment core GeoB6211-2 [dataset]. Department of Geosciences, Bremen University, PANGAEA, https://doi.org/10.1594/PANGAEA.137022 https://doi.pangaea.de/10.1594/PANGAEA.805136 https://doi.org/10.1594/PANGAEA.805136 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Razik, Sebastian; Chiessi, Cristiano Mazur; Romero, Oscar E; von Dobeneck, Tilo (2013): Interaction of the South American Monsoon System and the Southern Westerly Wind Belt during the last 14 kyr. Palaeogeography, Palaeoclimatology, Palaeoecology, 374, 28-40, https://doi.org/10.1016/j.palaeo.2012.12.022 Argentine Basin Center for Marine Environmental Sciences GeoB GeoB6211-2 Geosciences University of Bremen Gravity corer (Kiel type) M46/2 MARUM Meteor (1986) SL dataset publication series 2013 ftpangaea https://doi.org/10.1594/PANGAEA.80513610.1016/j.palaeo.2012.12.02210.1594/PANGAEA.13705410.1594/PANGAEA.137022 2024-07-24T02:31:21Z Surface currents and sediment distribution of the SE South American upper continental margin are under influence of the South American Monsoon System (SAMS) and the Southern Westerly Wind Belt (SWWB). Both climatic systems determine the meridional position of the Subtropical Shelf Front (STSF) and probably also of the Brazil-Malvinas Confluence (BMC). We reconstruct the changing impact of the SAMS and the SWWB on sediment composition at the upper Rio Grande Cone off southern Brazil during the last 14 cal kyr combining sedimentological, geochemical, micropaleontological and rock magnetic proxies of marine sediment core GeoB 6211-2. Sharp reciprocal changes in ferri- and paramagnetic mineral content and prominent grain-size shifts give strong clues to systematic source changes and transport modes of these mostly terrigenous sediments. Our interpretations support the assumption that the SAMS over SE South America was weaker than today during most of the Late Glacial and entire Early Holocene, while the SWWB was contracted to more southern latitudes, resembling modern austral summer-like conditions. In consequence, the STSF and the BMC were driven to more southern positions than today's, favoring the deposition of Fe-rich but weakly magnetic La Plata River silts at the Rio Grande Cone. During the Mid Holocene, the northern boundary of the SWWB migrated northward, while the STSF reached its northernmost position of the last 14 cal kyr and the BMC most likely arrived at its modern position. This shift enabled the transport of Antarctic diatoms and more strongly magnetic Argentinean shelf sands to the Rio Grande Cone, while sediment contributions from the La Plata River became less important. During the Late Holocene, the modern El Niño Southern Oscillation set in and the SAMS and the austral tradewinds intensified, causing a southward shift of the STSF to its modern position. This reinforced a significant deposition of La Plata River silts at the Rio Grande Cone. These higher magnetic silts with intermediate Fe ... Other/Unknown Material Antarc* Antarctic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-50.242700,-50.242700,-32.505200,-32.505200) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Argentine Basin Center for Marine Environmental Sciences GeoB GeoB6211-2 Geosciences University of Bremen Gravity corer (Kiel type) M46/2 MARUM Meteor (1986) SL |
spellingShingle |
Argentine Basin Center for Marine Environmental Sciences GeoB GeoB6211-2 Geosciences University of Bremen Gravity corer (Kiel type) M46/2 MARUM Meteor (1986) SL Razik, Sebastian Chiessi, Cristiano Mazur Romero, Oscar E von Dobeneck, Tilo Sedimentological, geochemical, micropaleontological and rock magnetic proxies of sediment core GeoB6211-2 |
topic_facet |
Argentine Basin Center for Marine Environmental Sciences GeoB GeoB6211-2 Geosciences University of Bremen Gravity corer (Kiel type) M46/2 MARUM Meteor (1986) SL |
description |
Surface currents and sediment distribution of the SE South American upper continental margin are under influence of the South American Monsoon System (SAMS) and the Southern Westerly Wind Belt (SWWB). Both climatic systems determine the meridional position of the Subtropical Shelf Front (STSF) and probably also of the Brazil-Malvinas Confluence (BMC). We reconstruct the changing impact of the SAMS and the SWWB on sediment composition at the upper Rio Grande Cone off southern Brazil during the last 14 cal kyr combining sedimentological, geochemical, micropaleontological and rock magnetic proxies of marine sediment core GeoB 6211-2. Sharp reciprocal changes in ferri- and paramagnetic mineral content and prominent grain-size shifts give strong clues to systematic source changes and transport modes of these mostly terrigenous sediments. Our interpretations support the assumption that the SAMS over SE South America was weaker than today during most of the Late Glacial and entire Early Holocene, while the SWWB was contracted to more southern latitudes, resembling modern austral summer-like conditions. In consequence, the STSF and the BMC were driven to more southern positions than today's, favoring the deposition of Fe-rich but weakly magnetic La Plata River silts at the Rio Grande Cone. During the Mid Holocene, the northern boundary of the SWWB migrated northward, while the STSF reached its northernmost position of the last 14 cal kyr and the BMC most likely arrived at its modern position. This shift enabled the transport of Antarctic diatoms and more strongly magnetic Argentinean shelf sands to the Rio Grande Cone, while sediment contributions from the La Plata River became less important. During the Late Holocene, the modern El Niño Southern Oscillation set in and the SAMS and the austral tradewinds intensified, causing a southward shift of the STSF to its modern position. This reinforced a significant deposition of La Plata River silts at the Rio Grande Cone. These higher magnetic silts with intermediate Fe ... |
format |
Other/Unknown Material |
author |
Razik, Sebastian Chiessi, Cristiano Mazur Romero, Oscar E von Dobeneck, Tilo |
author_facet |
Razik, Sebastian Chiessi, Cristiano Mazur Romero, Oscar E von Dobeneck, Tilo |
author_sort |
Razik, Sebastian |
title |
Sedimentological, geochemical, micropaleontological and rock magnetic proxies of sediment core GeoB6211-2 |
title_short |
Sedimentological, geochemical, micropaleontological and rock magnetic proxies of sediment core GeoB6211-2 |
title_full |
Sedimentological, geochemical, micropaleontological and rock magnetic proxies of sediment core GeoB6211-2 |
title_fullStr |
Sedimentological, geochemical, micropaleontological and rock magnetic proxies of sediment core GeoB6211-2 |
title_full_unstemmed |
Sedimentological, geochemical, micropaleontological and rock magnetic proxies of sediment core GeoB6211-2 |
title_sort |
sedimentological, geochemical, micropaleontological and rock magnetic proxies of sediment core geob6211-2 |
publisher |
PANGAEA |
publishDate |
2013 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.805136 https://doi.org/10.1594/PANGAEA.805136 |
op_coverage |
LATITUDE: -32.505200 * LONGITUDE: -50.242700 * DATE/TIME START: 1999-12-12T17:21:00 * DATE/TIME END: 1999-12-12T17:21:00 |
long_lat |
ENVELOPE(-50.242700,-50.242700,-32.505200,-32.505200) |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Supplement to: Razik, Sebastian; Chiessi, Cristiano Mazur; Romero, Oscar E; von Dobeneck, Tilo (2013): Interaction of the South American Monsoon System and the Southern Westerly Wind Belt during the last 14 kyr. Palaeogeography, Palaeoclimatology, Palaeoecology, 374, 28-40, https://doi.org/10.1016/j.palaeo.2012.12.022 |
op_relation |
Müller, Peter J (2004): Carbon and nitrogen data of sediment core GeoB6211-2 [dataset]. Department of Geosciences, Bremen University, PANGAEA, https://doi.org/10.1594/PANGAEA.137054 Müller, Peter J (2004): Density and water content of sediment core GeoB6211-2 [dataset]. Department of Geosciences, Bremen University, PANGAEA, https://doi.org/10.1594/PANGAEA.137022 https://doi.pangaea.de/10.1594/PANGAEA.805136 https://doi.org/10.1594/PANGAEA.805136 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.80513610.1016/j.palaeo.2012.12.02210.1594/PANGAEA.13705410.1594/PANGAEA.137022 |
_version_ |
1810490113921122304 |