Seismic reflection imaging of a canyon system at the Argentine continental margin to identify changes in sediment transport und ocean circulation
The deposition of contourites in the oceans is controlled by bottom water currents and thus the characterization of contouritic features (e.g. sediment drifts, moats) with seismic reflection data provides a means to reconstruct past changes in the abyssal circulation. This is particularly challengin...
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ftawi:oai:epic.awi.de:30435 2024-09-15T17:44:51+00:00 Seismic reflection imaging of a canyon system at the Argentine continental margin to identify changes in sediment transport und ocean circulation Gruetzner, Jens Uenzelmann-Neben, Gabriele Franke, Dieter 2012 application/pdf https://epic.awi.de/id/eprint/30435/ https://epic.awi.de/id/eprint/30435/1/EGU2012-4268.pdf https://hdl.handle.net/10013/epic.39354 https://hdl.handle.net/10013/epic.39354.d001 unknown https://epic.awi.de/id/eprint/30435/1/EGU2012-4268.pdf https://hdl.handle.net/10013/epic.39354.d001 Gruetzner, J. orcid:0000-0001-5445-2393 , Uenzelmann-Neben, G. orcid:0000-0002-0115-5923 and Franke, D. (2012) Seismic reflection imaging of a canyon system at the Argentine continental margin to identify changes in sediment transport und ocean circulation , EGU General Assembly 2012, Vienna, 22 April 2012 - 27 April 2012 . hdl:10013/epic.39354 EPIC3EGU General Assembly 2012, Vienna, 2012-04-22-2012-04-27 Conference notRev 2012 ftawi 2024-06-24T04:05:07Z The deposition of contourites in the oceans is controlled by bottom water currents and thus the characterization of contouritic features (e.g. sediment drifts, moats) with seismic reflection data provides a means to reconstruct past changes in the abyssal circulation. This is particularly challenging in areas with significant interaction of the contour currents with turbiditic processes. We here present a detailed investigation of such a depositional system located between 41 and 45S at the slope of the Argentine continental margin. A complex history of sediment deposition in the study area is indicated by the presence of a canyon system, submarine channels and sediment drifts. We use a dense grid of seismic reflection profiles to identify sedimentary units from regional reflector PLe (~65 Ma) upward, map depocentre geometries and separate along-slope from down-slope processes. The most prominent indicator for along-slope current controlled transport processes is a detached, elongated and buried sediment drift that most likely is the extension of a giant drift previously identified further to the south where it crops out at the seafloor. Overall, the feature extends over more than 400 km along the margin and is bounded by regional reflectors AR4 and AR5. Based on a tentative seismostratigraphy for the area the drift grew from ~34 to 17 Ma and was likely shaped by Antarctic bottom water (AABW) circulating in the Argentine Basin. Along with Miocene climate cooling (< 12 Ma) down-slope processes became more prominent. The upper sedimentary column is characterized by a major erosional unconformity and the development of the canyon system. Conference Object Antarc* Antarctic Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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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 |
The deposition of contourites in the oceans is controlled by bottom water currents and thus the characterization of contouritic features (e.g. sediment drifts, moats) with seismic reflection data provides a means to reconstruct past changes in the abyssal circulation. This is particularly challenging in areas with significant interaction of the contour currents with turbiditic processes. We here present a detailed investigation of such a depositional system located between 41 and 45S at the slope of the Argentine continental margin. A complex history of sediment deposition in the study area is indicated by the presence of a canyon system, submarine channels and sediment drifts. We use a dense grid of seismic reflection profiles to identify sedimentary units from regional reflector PLe (~65 Ma) upward, map depocentre geometries and separate along-slope from down-slope processes. The most prominent indicator for along-slope current controlled transport processes is a detached, elongated and buried sediment drift that most likely is the extension of a giant drift previously identified further to the south where it crops out at the seafloor. Overall, the feature extends over more than 400 km along the margin and is bounded by regional reflectors AR4 and AR5. Based on a tentative seismostratigraphy for the area the drift grew from ~34 to 17 Ma and was likely shaped by Antarctic bottom water (AABW) circulating in the Argentine Basin. Along with Miocene climate cooling (< 12 Ma) down-slope processes became more prominent. The upper sedimentary column is characterized by a major erosional unconformity and the development of the canyon system. |
format |
Conference Object |
author |
Gruetzner, Jens Uenzelmann-Neben, Gabriele Franke, Dieter |
spellingShingle |
Gruetzner, Jens Uenzelmann-Neben, Gabriele Franke, Dieter Seismic reflection imaging of a canyon system at the Argentine continental margin to identify changes in sediment transport und ocean circulation |
author_facet |
Gruetzner, Jens Uenzelmann-Neben, Gabriele Franke, Dieter |
author_sort |
Gruetzner, Jens |
title |
Seismic reflection imaging of a canyon system at the Argentine continental margin to identify changes in sediment transport und ocean circulation |
title_short |
Seismic reflection imaging of a canyon system at the Argentine continental margin to identify changes in sediment transport und ocean circulation |
title_full |
Seismic reflection imaging of a canyon system at the Argentine continental margin to identify changes in sediment transport und ocean circulation |
title_fullStr |
Seismic reflection imaging of a canyon system at the Argentine continental margin to identify changes in sediment transport und ocean circulation |
title_full_unstemmed |
Seismic reflection imaging of a canyon system at the Argentine continental margin to identify changes in sediment transport und ocean circulation |
title_sort |
seismic reflection imaging of a canyon system at the argentine continental margin to identify changes in sediment transport und ocean circulation |
publishDate |
2012 |
url |
https://epic.awi.de/id/eprint/30435/ https://epic.awi.de/id/eprint/30435/1/EGU2012-4268.pdf https://hdl.handle.net/10013/epic.39354 https://hdl.handle.net/10013/epic.39354.d001 |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
EPIC3EGU General Assembly 2012, Vienna, 2012-04-22-2012-04-27 |
op_relation |
https://epic.awi.de/id/eprint/30435/1/EGU2012-4268.pdf https://hdl.handle.net/10013/epic.39354.d001 Gruetzner, J. orcid:0000-0001-5445-2393 , Uenzelmann-Neben, G. orcid:0000-0002-0115-5923 and Franke, D. (2012) Seismic reflection imaging of a canyon system at the Argentine continental margin to identify changes in sediment transport und ocean circulation , EGU General Assembly 2012, Vienna, 22 April 2012 - 27 April 2012 . hdl:10013/epic.39354 |
_version_ |
1810492533018460160 |