Late Pleistocene oceanographic and depositional variations along the Wilkes Land margin (East Antarctica) reconstructed with geochemical proxies in deep-sea sediments
Water masses and depositional environments over the last 500 ka were reconstructed using absolute and relative abundances of lithogenous, biogenous and redox-sensitive elements in four sediment cores from two channel-levee systems of the Wilkes Land continental slope (East Antarctica). Sediments old...
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Online Access: | https://epic.awi.de/id/eprint/50542/ https://doi.org/10.1016/j.gloplacha.2019.103045 https://hdl.handle.net/10013/epic.606d0978-26d0-4bbf-9ade-f315c133fc50 |
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ftawi:oai:epic.awi.de:50542 2023-05-15T13:45:21+02:00 Late Pleistocene oceanographic and depositional variations along the Wilkes Land margin (East Antarctica) reconstructed with geochemical proxies in deep-sea sediments Jimenez-Espejo, Francisco J. Presti, Massimo Kuhn, Gerhard Mckay, Robert Crosta, Xavier Escutia, Carlota Lucchi, Renata G. Tolotti, Raffaella Yoshimura, Toshihiro Ortega Huertas, Miguel Macrì, Patrizia Caburlotto, Andrea De Santis, Laura 2020 https://epic.awi.de/id/eprint/50542/ https://doi.org/10.1016/j.gloplacha.2019.103045 https://hdl.handle.net/10013/epic.606d0978-26d0-4bbf-9ade-f315c133fc50 unknown Jimenez-Espejo, F. J. , Presti, M. , Kuhn, G. orcid:0000-0001-6069-7485 , Mckay, R. , Crosta, X. , Escutia, C. , Lucchi, R. G. , Tolotti, R. , Yoshimura, T. , Ortega Huertas, M. , Macrì, P. , Caburlotto, A. and De Santis, L. (2020) Late Pleistocene oceanographic and depositional variations along the Wilkes Land margin (East Antarctica) reconstructed with geochemical proxies in deep-sea sediments , Global and Planetary Change, 184 , p. 103045 . doi:10.1016/j.gloplacha.2019.103045 <https://doi.org/10.1016/j.gloplacha.2019.103045> , hdl:10013/epic.606d0978-26d0-4bbf-9ade-f315c133fc50 EPIC3Global and Planetary Change, 184, pp. 103045, ISSN: 09218181 Article isiRev 2020 ftawi https://doi.org/10.1016/j.gloplacha.2019.103045 2021-12-24T15:45:04Z Water masses and depositional environments over the last 500 ka were reconstructed using absolute and relative abundances of lithogenous, biogenous and redox-sensitive elements in four sediment cores from two channel-levee systems of the Wilkes Land continental slope (East Antarctica). Sediments older than the Mid-Bruhnes event (MBE, 430 ka BP) show reduced glacial/interglacial variability in the abundance of elements associated to the terrigenous mineral phases (i.e. Al, Ti, Fe and partly Si). This suggests minor ice-sheet size changes occurred in the Antarctic margin during the pre-MBE “lukewarm” interval. Post-MBE sediments record instead a high variability between glacial and interglacial periods in the concentration of terrigenous and biogenous (i.e. Ca, Ba) elements suggesting larger amplitude changes in both ice-sheet size and ocean conditions toward the gradual establishment of last glacial cycle conditions. Moreover, a marked increase of Mn during the glacial to interglacial transitions, indicates a post-depositional migration of the redox front and re-oxidation of the surface sediment layers linked to major changes in bottom water oxygen conditions associated to Antarctic Bottom Water formation along the margin at the onset of deglaciations. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Sheet Wilkes Land Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic East Antarctica The Antarctic Wilkes Land ENVELOPE(120.000,120.000,-69.000,-69.000) Global and Planetary Change 184 103045 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Water masses and depositional environments over the last 500 ka were reconstructed using absolute and relative abundances of lithogenous, biogenous and redox-sensitive elements in four sediment cores from two channel-levee systems of the Wilkes Land continental slope (East Antarctica). Sediments older than the Mid-Bruhnes event (MBE, 430 ka BP) show reduced glacial/interglacial variability in the abundance of elements associated to the terrigenous mineral phases (i.e. Al, Ti, Fe and partly Si). This suggests minor ice-sheet size changes occurred in the Antarctic margin during the pre-MBE “lukewarm” interval. Post-MBE sediments record instead a high variability between glacial and interglacial periods in the concentration of terrigenous and biogenous (i.e. Ca, Ba) elements suggesting larger amplitude changes in both ice-sheet size and ocean conditions toward the gradual establishment of last glacial cycle conditions. Moreover, a marked increase of Mn during the glacial to interglacial transitions, indicates a post-depositional migration of the redox front and re-oxidation of the surface sediment layers linked to major changes in bottom water oxygen conditions associated to Antarctic Bottom Water formation along the margin at the onset of deglaciations. |
format |
Article in Journal/Newspaper |
author |
Jimenez-Espejo, Francisco J. Presti, Massimo Kuhn, Gerhard Mckay, Robert Crosta, Xavier Escutia, Carlota Lucchi, Renata G. Tolotti, Raffaella Yoshimura, Toshihiro Ortega Huertas, Miguel Macrì, Patrizia Caburlotto, Andrea De Santis, Laura |
spellingShingle |
Jimenez-Espejo, Francisco J. Presti, Massimo Kuhn, Gerhard Mckay, Robert Crosta, Xavier Escutia, Carlota Lucchi, Renata G. Tolotti, Raffaella Yoshimura, Toshihiro Ortega Huertas, Miguel Macrì, Patrizia Caburlotto, Andrea De Santis, Laura Late Pleistocene oceanographic and depositional variations along the Wilkes Land margin (East Antarctica) reconstructed with geochemical proxies in deep-sea sediments |
author_facet |
Jimenez-Espejo, Francisco J. Presti, Massimo Kuhn, Gerhard Mckay, Robert Crosta, Xavier Escutia, Carlota Lucchi, Renata G. Tolotti, Raffaella Yoshimura, Toshihiro Ortega Huertas, Miguel Macrì, Patrizia Caburlotto, Andrea De Santis, Laura |
author_sort |
Jimenez-Espejo, Francisco J. |
title |
Late Pleistocene oceanographic and depositional variations along the Wilkes Land margin (East Antarctica) reconstructed with geochemical proxies in deep-sea sediments |
title_short |
Late Pleistocene oceanographic and depositional variations along the Wilkes Land margin (East Antarctica) reconstructed with geochemical proxies in deep-sea sediments |
title_full |
Late Pleistocene oceanographic and depositional variations along the Wilkes Land margin (East Antarctica) reconstructed with geochemical proxies in deep-sea sediments |
title_fullStr |
Late Pleistocene oceanographic and depositional variations along the Wilkes Land margin (East Antarctica) reconstructed with geochemical proxies in deep-sea sediments |
title_full_unstemmed |
Late Pleistocene oceanographic and depositional variations along the Wilkes Land margin (East Antarctica) reconstructed with geochemical proxies in deep-sea sediments |
title_sort |
late pleistocene oceanographic and depositional variations along the wilkes land margin (east antarctica) reconstructed with geochemical proxies in deep-sea sediments |
publishDate |
2020 |
url |
https://epic.awi.de/id/eprint/50542/ https://doi.org/10.1016/j.gloplacha.2019.103045 https://hdl.handle.net/10013/epic.606d0978-26d0-4bbf-9ade-f315c133fc50 |
long_lat |
ENVELOPE(120.000,120.000,-69.000,-69.000) |
geographic |
Antarctic East Antarctica The Antarctic Wilkes Land |
geographic_facet |
Antarctic East Antarctica The Antarctic Wilkes Land |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Wilkes Land |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Wilkes Land |
op_source |
EPIC3Global and Planetary Change, 184, pp. 103045, ISSN: 09218181 |
op_relation |
Jimenez-Espejo, F. J. , Presti, M. , Kuhn, G. orcid:0000-0001-6069-7485 , Mckay, R. , Crosta, X. , Escutia, C. , Lucchi, R. G. , Tolotti, R. , Yoshimura, T. , Ortega Huertas, M. , Macrì, P. , Caburlotto, A. and De Santis, L. (2020) Late Pleistocene oceanographic and depositional variations along the Wilkes Land margin (East Antarctica) reconstructed with geochemical proxies in deep-sea sediments , Global and Planetary Change, 184 , p. 103045 . doi:10.1016/j.gloplacha.2019.103045 <https://doi.org/10.1016/j.gloplacha.2019.103045> , hdl:10013/epic.606d0978-26d0-4bbf-9ade-f315c133fc50 |
op_doi |
https://doi.org/10.1016/j.gloplacha.2019.103045 |
container_title |
Global and Planetary Change |
container_volume |
184 |
container_start_page |
103045 |
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1766221794606317568 |