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,...
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ftconicet:oai:ri.conicet.gov.ar:11336/4598 2023-10-09T21:45:37+02:00 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 Susana Haberzettl, Torsten Jouve, Guillaume Francus, Pierre Olhendorf, Christian Gebhardt, Catalina Zolitschka, Bernd The Pasado Science Team application/pdf http://hdl.handle.net/11336/4598 eng eng Elsevier info:eu-repo/semantics/altIdentifier/url/http://dx.doi.org/10.1016/j.epsl.2014.11.007 info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0012821X14006980 info:eu-repo/semantics/altIdentifier/issn/0012-821X http://hdl.handle.net/11336/4598 Lisé Pronovost, Agathe; St Onge, Guillaume; Gogorza, Claudia Susana; Haberzettl, Torsten; Jouve, Guillaume; et al.; Rock-magnetic proxies of wind intensity and dust since 51,200 cal BP from lacustrine sediments of Laguna Potrok Aike, southeastern Patagonia; Elsevier; Earth and Planetary Science Letters; 411; 12-2014; 72-86 0012-821X info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-nd/2.5/ar/ Rock Magnetism Wind Intensity Dust Lake Sediments Pasado Southern Hemisphere Wind Intensity https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion ftconicet https://doi.org/10.1016/j.epsl.2014.11.007 2023-09-24T19:30:31Z 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 indicatesthe 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, kLFis interpreted as a dust indicator in the dust source of southern Patagonia at the millennial time scale, when ferrimagnetic grain size and coercivity influence areminimal. 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 MDFIRMup to the centennial time scale. MDFIRMis 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. Fil: Lisé Pronovost, Agathe. Université du Québec à Rimouski. Canada Research Chair in Marine Geology. Institut des sciences de la mer de Rimouski; Canadá. GEOTOP Research Center; ... Article in Journal/Newspaper Antarc* Antarctica Southern Ocean CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Southern Ocean Patagonia Canada Earth and Planetary Science Letters 411 72 86 |
institution |
Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
Rock Magnetism Wind Intensity Dust Lake Sediments Pasado Southern Hemisphere Wind Intensity https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
spellingShingle |
Rock Magnetism Wind Intensity Dust Lake Sediments Pasado Southern Hemisphere Wind Intensity https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 Lisé Pronovost, Agathe St Onge, Guillaume Gogorza, Claudia Susana Haberzettl, Torsten Jouve, Guillaume Francus, Pierre Olhendorf, Christian Gebhardt, Catalina Zolitschka, Bernd The Pasado Science Team Rock-magnetic proxies of wind intensity and dust since 51,200 cal BP from lacustrine sediments of Laguna Potrok Aike, southeastern Patagonia |
topic_facet |
Rock Magnetism Wind Intensity Dust Lake Sediments Pasado Southern Hemisphere Wind Intensity https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
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 indicatesthe 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, kLFis interpreted as a dust indicator in the dust source of southern Patagonia at the millennial time scale, when ferrimagnetic grain size and coercivity influence areminimal. 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 MDFIRMup to the centennial time scale. MDFIRMis 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. Fil: Lisé Pronovost, Agathe. Université du Québec à Rimouski. Canada Research Chair in Marine Geology. Institut des sciences de la mer de Rimouski; Canadá. GEOTOP Research Center; ... |
format |
Article in Journal/Newspaper |
author |
Lisé Pronovost, Agathe St Onge, Guillaume Gogorza, Claudia Susana Haberzettl, Torsten Jouve, Guillaume Francus, Pierre Olhendorf, Christian Gebhardt, Catalina Zolitschka, Bernd The Pasado Science Team |
author_facet |
Lisé Pronovost, Agathe St Onge, Guillaume Gogorza, Claudia Susana Haberzettl, Torsten Jouve, Guillaume Francus, Pierre Olhendorf, Christian Gebhardt, Catalina Zolitschka, Bernd The Pasado Science Team |
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 |
publisher |
Elsevier |
url |
http://hdl.handle.net/11336/4598 |
geographic |
Southern Ocean Patagonia Canada |
geographic_facet |
Southern Ocean Patagonia Canada |
genre |
Antarc* Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctica Southern Ocean |
op_relation |
info:eu-repo/semantics/altIdentifier/url/http://dx.doi.org/10.1016/j.epsl.2014.11.007 info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0012821X14006980 info:eu-repo/semantics/altIdentifier/issn/0012-821X http://hdl.handle.net/11336/4598 Lisé Pronovost, Agathe; St Onge, Guillaume; Gogorza, Claudia Susana; Haberzettl, Torsten; Jouve, Guillaume; et al.; Rock-magnetic proxies of wind intensity and dust since 51,200 cal BP from lacustrine sediments of Laguna Potrok Aike, southeastern Patagonia; Elsevier; Earth and Planetary Science Letters; 411; 12-2014; 72-86 0012-821X |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-nd/2.5/ar/ |
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_ |
1779320415110299648 |