Lead isotopic evidence for an Australian source of aeolian dust to Antarctica at times over the last 170,000 years
Systematic analysis of Pb, Sr and Nd isotopes of 32 fluvial clay samples (< 2 μm fraction) from many of the major tributaries of the vast (1.10 6 km 2 ) Murray Darling Basin (MDB), located in semiarid southeastern Australia, displays similar isotopic values between some MDB clays and dust from se...
Published in: | Palaeogeography, Palaeoclimatology, Palaeoecology |
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ftmacquarieunicr:oai:https://researchers.mq.edu.au:publications/06d5512f-72b2-4fb8-99e8-f117d349a784 2024-09-30T14:27:13+00:00 Lead isotopic evidence for an Australian source of aeolian dust to Antarctica at times over the last 170,000 years De Deckker, Patrick Norman, Marc Goodwin, Ian D. Wain, Alan Gingele, Franz X. 2010-01-15 https://researchers.mq.edu.au/en/publications/06d5512f-72b2-4fb8-99e8-f117d349a784 https://doi.org/10.1016/j.palaeo.2009.11.013 http://www.scopus.com/inward/record.url?scp=72749086798&partnerID=8YFLogxK eng eng info:eu-repo/semantics/closedAccess De Deckker , P , Norman , M , Goodwin , I D , Wain , A & Gingele , F X 2010 , ' Lead isotopic evidence for an Australian source of aeolian dust to Antarctica at times over the last 170,000 years ' , Palaeogeography, Palaeoclimatology, Palaeoecology , vol. 285 , no. 3-4 , pp. 205-223 . https://doi.org/10.1016/j.palaeo.2009.11.013 Airborne dust Antarctic ice cores Argentina EPICA Murray Darling Basin Nd isotopes Patagonia Pb Sr Vostok article 2010 ftmacquarieunicr https://doi.org/10.1016/j.palaeo.2009.11.013 2024-09-18T23:49:09Z Systematic analysis of Pb, Sr and Nd isotopes of 32 fluvial clay samples (< 2 μm fraction) from many of the major tributaries of the vast (1.10 6 km 2 ) Murray Darling Basin (MDB), located in semiarid southeastern Australia, displays similar isotopic values between some MDB clays and dust from several ice core samples from the EPICA Dome C in Antarctica. Close scrutiny of several ratios of the four Pb isotopes, and in particular 208 Pb/ 207 Pb versus 206 Pb/ 207 Pb, shows that several samples from the Darling-sub-basin of the MDB display similar values for the same isotopes for Dome C samples from different ages, and more particularly during wet phases in Australia [Marine Isotopic Stages 5e, 3 and 1]. The combination of Nd and Sr isotopic ratios from the same MDB fluvial clays clearly eliminates the Murray sub-basin, and supports the Darling sub-basin as a potential source of aeolian material to Antarctica. Overall, the Australian dust supply to Antarctica predominantly occurred during interglacial periods. The work presented here shows that aerosols generated in southeastern Australia can travel to parts of West Antarctica and this is supported by atmospheric observations and models. In addition, evidence of Australian dust in Antarctic ice cores further implies dust deposition in the Southern Ocean would have occurred in the past. Current meteorological observations also imply that the western Pacific and Indian Ocean sector of the Southern Ocean would frequently receive aeolian dust components originating from southeastern Australia. Article in Journal/Newspaper Antarc* Antarctic Antarctica EPICA ice core Southern Ocean West Antarctica Macquarie University Research Portal Antarctic Southern Ocean Patagonia West Antarctica Pacific Indian Argentina Palaeogeography, Palaeoclimatology, Palaeoecology 285 3-4 205 223 |
institution |
Open Polar |
collection |
Macquarie University Research Portal |
op_collection_id |
ftmacquarieunicr |
language |
English |
topic |
Airborne dust Antarctic ice cores Argentina EPICA Murray Darling Basin Nd isotopes Patagonia Pb Sr Vostok |
spellingShingle |
Airborne dust Antarctic ice cores Argentina EPICA Murray Darling Basin Nd isotopes Patagonia Pb Sr Vostok De Deckker, Patrick Norman, Marc Goodwin, Ian D. Wain, Alan Gingele, Franz X. Lead isotopic evidence for an Australian source of aeolian dust to Antarctica at times over the last 170,000 years |
topic_facet |
Airborne dust Antarctic ice cores Argentina EPICA Murray Darling Basin Nd isotopes Patagonia Pb Sr Vostok |
description |
Systematic analysis of Pb, Sr and Nd isotopes of 32 fluvial clay samples (< 2 μm fraction) from many of the major tributaries of the vast (1.10 6 km 2 ) Murray Darling Basin (MDB), located in semiarid southeastern Australia, displays similar isotopic values between some MDB clays and dust from several ice core samples from the EPICA Dome C in Antarctica. Close scrutiny of several ratios of the four Pb isotopes, and in particular 208 Pb/ 207 Pb versus 206 Pb/ 207 Pb, shows that several samples from the Darling-sub-basin of the MDB display similar values for the same isotopes for Dome C samples from different ages, and more particularly during wet phases in Australia [Marine Isotopic Stages 5e, 3 and 1]. The combination of Nd and Sr isotopic ratios from the same MDB fluvial clays clearly eliminates the Murray sub-basin, and supports the Darling sub-basin as a potential source of aeolian material to Antarctica. Overall, the Australian dust supply to Antarctica predominantly occurred during interglacial periods. The work presented here shows that aerosols generated in southeastern Australia can travel to parts of West Antarctica and this is supported by atmospheric observations and models. In addition, evidence of Australian dust in Antarctic ice cores further implies dust deposition in the Southern Ocean would have occurred in the past. Current meteorological observations also imply that the western Pacific and Indian Ocean sector of the Southern Ocean would frequently receive aeolian dust components originating from southeastern Australia. |
format |
Article in Journal/Newspaper |
author |
De Deckker, Patrick Norman, Marc Goodwin, Ian D. Wain, Alan Gingele, Franz X. |
author_facet |
De Deckker, Patrick Norman, Marc Goodwin, Ian D. Wain, Alan Gingele, Franz X. |
author_sort |
De Deckker, Patrick |
title |
Lead isotopic evidence for an Australian source of aeolian dust to Antarctica at times over the last 170,000 years |
title_short |
Lead isotopic evidence for an Australian source of aeolian dust to Antarctica at times over the last 170,000 years |
title_full |
Lead isotopic evidence for an Australian source of aeolian dust to Antarctica at times over the last 170,000 years |
title_fullStr |
Lead isotopic evidence for an Australian source of aeolian dust to Antarctica at times over the last 170,000 years |
title_full_unstemmed |
Lead isotopic evidence for an Australian source of aeolian dust to Antarctica at times over the last 170,000 years |
title_sort |
lead isotopic evidence for an australian source of aeolian dust to antarctica at times over the last 170,000 years |
publishDate |
2010 |
url |
https://researchers.mq.edu.au/en/publications/06d5512f-72b2-4fb8-99e8-f117d349a784 https://doi.org/10.1016/j.palaeo.2009.11.013 http://www.scopus.com/inward/record.url?scp=72749086798&partnerID=8YFLogxK |
geographic |
Antarctic Southern Ocean Patagonia West Antarctica Pacific Indian Argentina |
geographic_facet |
Antarctic Southern Ocean Patagonia West Antarctica Pacific Indian Argentina |
genre |
Antarc* Antarctic Antarctica EPICA ice core Southern Ocean West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica EPICA ice core Southern Ocean West Antarctica |
op_source |
De Deckker , P , Norman , M , Goodwin , I D , Wain , A & Gingele , F X 2010 , ' Lead isotopic evidence for an Australian source of aeolian dust to Antarctica at times over the last 170,000 years ' , Palaeogeography, Palaeoclimatology, Palaeoecology , vol. 285 , no. 3-4 , pp. 205-223 . https://doi.org/10.1016/j.palaeo.2009.11.013 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.palaeo.2009.11.013 |
container_title |
Palaeogeography, Palaeoclimatology, Palaeoecology |
container_volume |
285 |
container_issue |
3-4 |
container_start_page |
205 |
op_container_end_page |
223 |
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1811633367815290880 |