Detailed seismic analysis of the Terraces sector in the southern Argentine Basin: implications for bottom water flow changes during the Neogene
Sedimentary processes in the Argentine Basin and particularly on the Argentine margin are largely controlled by the interaction of the seafloor with the abyssal circulation which is characterised by the interaction of northward flowing Antarctic water masses (Antarctic Intermediate Water, AAIW; Circ...
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ftawi:oai:epic.awi.de:25842 2024-09-15T17:44:58+00:00 Detailed seismic analysis of the Terraces sector in the southern Argentine Basin: implications for bottom water flow changes during the Neogene Gruetzner, Jens Uenzelmann-Neben, Gabriele Franke, Dieter 2011 https://epic.awi.de/id/eprint/25842/ https://hdl.handle.net/10013/epic.38778 unknown Gruetzner, J. orcid:0000-0001-5445-2393 , Uenzelmann-Neben, G. orcid:0000-0002-0115-5923 and Franke, D. (2011) Detailed seismic analysis of the Terraces sector in the southern Argentine Basin: implications for bottom water flow changes during the Neogene , Colloquium of the DFG Priority Program SPP1375:South Atlantic Margin Processes and Links with onshore Evolution (SAMPLE), Potsdam, 7 June 2011 - 10 June 2011 . hdl:10013/epic.38778 EPIC3Colloquium of the DFG Priority Program SPP1375:South Atlantic Margin Processes and Links with onshore Evolution (SAMPLE), Potsdam, 2011-06-07-2011-06-10 Conference notRev 2011 ftawi 2024-06-24T04:03:41Z Sedimentary processes in the Argentine Basin and particularly on the Argentine margin are largely controlled by the interaction of the seafloor with the abyssal circulation which is characterised by the interaction of northward flowing Antarctic water masses (Antarctic Intermediate Water, AAIW; Circumpolar Deep Water, CDW; Antarctic Bottom Water, AABW) and southward flowing North Atlantic Deep Water (NADW). The interaction of these water masses with the seafloor is obvious from the fact that the present depths of each of the water masses coincide with the position of a specific sedimentary terrace on continental slope. This set of continental slope terraces located between 44°S and 48°S reveals both erosional (e.g. channels) and depositional (e.g. sediment drifts) features of contourites. Here, we present the internal seismic structure of the terraces (especially the Valentin Feilberg Terrace), identify phases of terraces evolution in a seismostratigraphic context and discuss their record of the variability of the Neogene Southern Ocean palaeoceanography in response to the influence of global climate and tectonic events. Maps of reflectors depth and seismic unit thickness are compiled and the shape and location of unit depocentres relative to the continental slope are interpreted as indications for the major transport and depositional processes. Based on regional correlation we established a seismostratigraphic model for the sedimentary development of the Valentine Feilberg Terrace. The terrace grew from 17 Ma onward mainly under the influence of geostrophic bottom currents (AABW and CDW) originating from the south. A prominent intermediate unit that exhibits an aggradational stacking pattern is inferred to have been deposited during the Miocene Climatic Optimum (MCO, ~17-14 Ma). Above this unit the sediment record of the Valentine Feilberg Terrace can be divided into 5 subunits that show a variety of different drifts, moats and channels and contain a high resolution palaeoceanographic record of late Miocene to ... Conference Object Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
Sedimentary processes in the Argentine Basin and particularly on the Argentine margin are largely controlled by the interaction of the seafloor with the abyssal circulation which is characterised by the interaction of northward flowing Antarctic water masses (Antarctic Intermediate Water, AAIW; Circumpolar Deep Water, CDW; Antarctic Bottom Water, AABW) and southward flowing North Atlantic Deep Water (NADW). The interaction of these water masses with the seafloor is obvious from the fact that the present depths of each of the water masses coincide with the position of a specific sedimentary terrace on continental slope. This set of continental slope terraces located between 44°S and 48°S reveals both erosional (e.g. channels) and depositional (e.g. sediment drifts) features of contourites. Here, we present the internal seismic structure of the terraces (especially the Valentin Feilberg Terrace), identify phases of terraces evolution in a seismostratigraphic context and discuss their record of the variability of the Neogene Southern Ocean palaeoceanography in response to the influence of global climate and tectonic events. Maps of reflectors depth and seismic unit thickness are compiled and the shape and location of unit depocentres relative to the continental slope are interpreted as indications for the major transport and depositional processes. Based on regional correlation we established a seismostratigraphic model for the sedimentary development of the Valentine Feilberg Terrace. The terrace grew from 17 Ma onward mainly under the influence of geostrophic bottom currents (AABW and CDW) originating from the south. A prominent intermediate unit that exhibits an aggradational stacking pattern is inferred to have been deposited during the Miocene Climatic Optimum (MCO, ~17-14 Ma). Above this unit the sediment record of the Valentine Feilberg Terrace can be divided into 5 subunits that show a variety of different drifts, moats and channels and contain a high resolution palaeoceanographic record of late Miocene to ... |
format |
Conference Object |
author |
Gruetzner, Jens Uenzelmann-Neben, Gabriele Franke, Dieter |
spellingShingle |
Gruetzner, Jens Uenzelmann-Neben, Gabriele Franke, Dieter Detailed seismic analysis of the Terraces sector in the southern Argentine Basin: implications for bottom water flow changes during the Neogene |
author_facet |
Gruetzner, Jens Uenzelmann-Neben, Gabriele Franke, Dieter |
author_sort |
Gruetzner, Jens |
title |
Detailed seismic analysis of the Terraces sector in the southern Argentine Basin: implications for bottom water flow changes during the Neogene |
title_short |
Detailed seismic analysis of the Terraces sector in the southern Argentine Basin: implications for bottom water flow changes during the Neogene |
title_full |
Detailed seismic analysis of the Terraces sector in the southern Argentine Basin: implications for bottom water flow changes during the Neogene |
title_fullStr |
Detailed seismic analysis of the Terraces sector in the southern Argentine Basin: implications for bottom water flow changes during the Neogene |
title_full_unstemmed |
Detailed seismic analysis of the Terraces sector in the southern Argentine Basin: implications for bottom water flow changes during the Neogene |
title_sort |
detailed seismic analysis of the terraces sector in the southern argentine basin: implications for bottom water flow changes during the neogene |
publishDate |
2011 |
url |
https://epic.awi.de/id/eprint/25842/ https://hdl.handle.net/10013/epic.38778 |
genre |
Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic Southern Ocean |
genre_facet |
Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic Southern Ocean |
op_source |
EPIC3Colloquium of the DFG Priority Program SPP1375:South Atlantic Margin Processes and Links with onshore Evolution (SAMPLE), Potsdam, 2011-06-07-2011-06-10 |
op_relation |
Gruetzner, J. orcid:0000-0001-5445-2393 , Uenzelmann-Neben, G. orcid:0000-0002-0115-5923 and Franke, D. (2011) Detailed seismic analysis of the Terraces sector in the southern Argentine Basin: implications for bottom water flow changes during the Neogene , Colloquium of the DFG Priority Program SPP1375:South Atlantic Margin Processes and Links with onshore Evolution (SAMPLE), Potsdam, 7 June 2011 - 10 June 2011 . hdl:10013/epic.38778 |
_version_ |
1810492653275447296 |