Rock-magnetic proxies of wind intensity and dust since 51,200 cal BP from lacustrine sediments of Laguna Potrok Aike, southeastern Patagonia
The sedimentary archive from Laguna Potrok Aike is the only continuous record reaching back to the last Glacial period in continental southeastern Patagonia. Located in the path of the Southern Hemisphere westerly winds and in the source region of dust deposited in Antarctica during Glacial periods,...
Published in: | Earth and Planetary Science Letters |
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Online Access: | https://epic.awi.de/id/eprint/43363/ https://doi.org/10.1016/j.epsl.2014.11.007 https://hdl.handle.net/10013/epic.49921 |
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ftawi:oai:epic.awi.de:43363 2024-09-15T17:47:06+00:00 Rock-magnetic proxies of wind intensity and dust since 51,200 cal BP from lacustrine sediments of Laguna Potrok Aike, southeastern Patagonia Lisé-Pronovost, Agathe St-Onge, Guillaume Gogorza, Claudia Haberzettl, Torsten Jouve, Guillaume Francus, Pierre Ohlendorf, Christian Gebhardt, A. Catalina Zolitschka, Bernd 2015 https://epic.awi.de/id/eprint/43363/ https://doi.org/10.1016/j.epsl.2014.11.007 https://hdl.handle.net/10013/epic.49921 unknown Lisé-Pronovost, A. , St-Onge, G. , Gogorza, C. , Haberzettl, T. , Jouve, G. , Francus, P. , Ohlendorf, C. , Gebhardt, A. C. orcid:0000-0002-3227-0676 and Zolitschka, B. (2015) Rock-magnetic proxies of wind intensity and dust since 51,200 cal BP from lacustrine sediments of Laguna Potrok Aike, southeastern Patagonia , Earth and Planetary Science Letters, 411 , pp. 72-86 . doi:10.1016/j.epsl.2014.11.007 <https://doi.org/10.1016/j.epsl.2014.11.007> , hdl:10013/epic.49921 EPIC3Earth and Planetary Science Letters, 411, pp. 72-86, ISSN: 0012821X Article isiRev 2015 ftawi https://doi.org/10.1016/j.epsl.2014.11.007 2024-06-24T04:16:35Z The sedimentary archive from Laguna Potrok Aike is the only continuous record reaching back to the last Glacial period in continental southeastern Patagonia. Located in the path of the Southern Hemisphere westerly winds and in the source region of dust deposited in Antarctica during Glacial periods, southern Patagonia is a vantage point to reconstruct past changes in aeolian activity. Here we use high-resolution rock-magnetic and physical grain size data from site 2 of the International Continental scientific Drilling Program (ICDP) Potrok Aike maar lake Sediment Archive Drilling prOject (PASADO) in order to develop magnetic proxies of dust and wind intensity at 52◦S since 51,200 cal BP. Rock-magnetic analysis indicates the magnetic mineral assemblage is dominated by detrital magnetite. Based on the estimated flux of magnetite to the lake and comparison with distal dust records from the Southern Ocean and Antarctica, kLF is interpreted as a dust indicator in the dust source of southern Patagonia at the millennial time scale, when ferrimagnetic grain size and coercivity influence are minimal. Comparison to physical grain- size data indicates that the median destructive field of isothermal remanent magnetization (MDFIRM) mostly reflects medium to coarse magnetite bearing silts typically transported by winds for short-term suspension. Comparison with wind-intensity proxies from the Southern Hemisphere during the last Glacial period and with regional records from Patagonia since the last deglaciation including marine, lacustrine and peat bog sediments as well as speleothems reveals similar variability with MDFIRM up to the centennial time scale. MDFIRM is interpreted as a wind-intensity proxy independent of moisture changes for southeastern Patagonia, with stronger winds capable of transporting coarser magnetite bearing silts to the lake. Article in Journal/Newspaper Antarc* Antarctica Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Earth and Planetary Science Letters 411 72 86 |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
The sedimentary archive from Laguna Potrok Aike is the only continuous record reaching back to the last Glacial period in continental southeastern Patagonia. Located in the path of the Southern Hemisphere westerly winds and in the source region of dust deposited in Antarctica during Glacial periods, southern Patagonia is a vantage point to reconstruct past changes in aeolian activity. Here we use high-resolution rock-magnetic and physical grain size data from site 2 of the International Continental scientific Drilling Program (ICDP) Potrok Aike maar lake Sediment Archive Drilling prOject (PASADO) in order to develop magnetic proxies of dust and wind intensity at 52◦S since 51,200 cal BP. Rock-magnetic analysis indicates the magnetic mineral assemblage is dominated by detrital magnetite. Based on the estimated flux of magnetite to the lake and comparison with distal dust records from the Southern Ocean and Antarctica, kLF is interpreted as a dust indicator in the dust source of southern Patagonia at the millennial time scale, when ferrimagnetic grain size and coercivity influence are minimal. Comparison to physical grain- size data indicates that the median destructive field of isothermal remanent magnetization (MDFIRM) mostly reflects medium to coarse magnetite bearing silts typically transported by winds for short-term suspension. Comparison with wind-intensity proxies from the Southern Hemisphere during the last Glacial period and with regional records from Patagonia since the last deglaciation including marine, lacustrine and peat bog sediments as well as speleothems reveals similar variability with MDFIRM up to the centennial time scale. MDFIRM is interpreted as a wind-intensity proxy independent of moisture changes for southeastern Patagonia, with stronger winds capable of transporting coarser magnetite bearing silts to the lake. |
format |
Article in Journal/Newspaper |
author |
Lisé-Pronovost, Agathe St-Onge, Guillaume Gogorza, Claudia Haberzettl, Torsten Jouve, Guillaume Francus, Pierre Ohlendorf, Christian Gebhardt, A. Catalina Zolitschka, Bernd |
spellingShingle |
Lisé-Pronovost, Agathe St-Onge, Guillaume Gogorza, Claudia Haberzettl, Torsten Jouve, Guillaume Francus, Pierre Ohlendorf, Christian Gebhardt, A. Catalina Zolitschka, Bernd Rock-magnetic proxies of wind intensity and dust since 51,200 cal BP from lacustrine sediments of Laguna Potrok Aike, southeastern Patagonia |
author_facet |
Lisé-Pronovost, Agathe St-Onge, Guillaume Gogorza, Claudia Haberzettl, Torsten Jouve, Guillaume Francus, Pierre Ohlendorf, Christian Gebhardt, A. Catalina Zolitschka, Bernd |
author_sort |
Lisé-Pronovost, Agathe |
title |
Rock-magnetic proxies of wind intensity and dust since 51,200 cal BP from lacustrine sediments of Laguna Potrok Aike, southeastern Patagonia |
title_short |
Rock-magnetic proxies of wind intensity and dust since 51,200 cal BP from lacustrine sediments of Laguna Potrok Aike, southeastern Patagonia |
title_full |
Rock-magnetic proxies of wind intensity and dust since 51,200 cal BP from lacustrine sediments of Laguna Potrok Aike, southeastern Patagonia |
title_fullStr |
Rock-magnetic proxies of wind intensity and dust since 51,200 cal BP from lacustrine sediments of Laguna Potrok Aike, southeastern Patagonia |
title_full_unstemmed |
Rock-magnetic proxies of wind intensity and dust since 51,200 cal BP from lacustrine sediments of Laguna Potrok Aike, southeastern Patagonia |
title_sort |
rock-magnetic proxies of wind intensity and dust since 51,200 cal bp from lacustrine sediments of laguna potrok aike, southeastern patagonia |
publishDate |
2015 |
url |
https://epic.awi.de/id/eprint/43363/ https://doi.org/10.1016/j.epsl.2014.11.007 https://hdl.handle.net/10013/epic.49921 |
genre |
Antarc* Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctica Southern Ocean |
op_source |
EPIC3Earth and Planetary Science Letters, 411, pp. 72-86, ISSN: 0012821X |
op_relation |
Lisé-Pronovost, A. , St-Onge, G. , Gogorza, C. , Haberzettl, T. , Jouve, G. , Francus, P. , Ohlendorf, C. , Gebhardt, A. C. orcid:0000-0002-3227-0676 and Zolitschka, B. (2015) Rock-magnetic proxies of wind intensity and dust since 51,200 cal BP from lacustrine sediments of Laguna Potrok Aike, southeastern Patagonia , Earth and Planetary Science Letters, 411 , pp. 72-86 . doi:10.1016/j.epsl.2014.11.007 <https://doi.org/10.1016/j.epsl.2014.11.007> , hdl:10013/epic.49921 |
op_doi |
https://doi.org/10.1016/j.epsl.2014.11.007 |
container_title |
Earth and Planetary Science Letters |
container_volume |
411 |
container_start_page |
72 |
op_container_end_page |
86 |
_version_ |
1810495708330983424 |