Rock-magnetic signature of precipitation and extreme runoff events in south-eastern Patagonia since 51,200 cal BP from the sediments of Laguna Potrok Aike.
A 106-m long sediment sequence from the maar lake Laguna Potrok Aike in southern Patagonia was recovered in the framework of the International Continental Scientific Drilling Program (ICDP) Potrok Aike maar lake Sediment Archive Drilling prOject (PASADO). About half of the sedimentary sequence is co...
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2014
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Online Access: | https://espace.inrs.ca/id/eprint/3622/ https://doi.org/10.1016/j.quascirev.2014.05.029 |
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ftinrsquebec:oai:espace.inrs.ca:3622 2023-05-15T13:52:41+02:00 Rock-magnetic signature of precipitation and extreme runoff events in south-eastern Patagonia since 51,200 cal BP from the sediments of Laguna Potrok Aike. Lisé-Pronovost, Agathe St-Onge, Guillaume Gogorza, Claudia Jouve, Guillaume Francus, Pierre Zolitschka, Bernd 2014 https://espace.inrs.ca/id/eprint/3622/ https://doi.org/10.1016/j.quascirev.2014.05.029 unknown Lisé-Pronovost, Agathe, St-Onge, Guillaume, Gogorza, Claudia, Jouve, Guillaume, Francus, Pierre et Zolitschka, Bernd (2014). Rock-magnetic signature of precipitation and extreme runoff events in south-eastern Patagonia since 51,200 cal BP from the sediments of Laguna Potrok Aike. Quaternary Science Reviews , vol. 98 . p. 110-125. DOI:10.1016/j.quascirev.2014.05.029 <https://doi.org/10.1016/j.quascirev.2014.05.029>. doi:10.1016/j.quascirev.2014.05.029 rock magnetism Laguna Potrok Aike lacustrine sediment paleoenvironment mass movement deposit gyroremanent magnetization Article Évalué par les pairs 2014 ftinrsquebec https://doi.org/10.1016/j.quascirev.2014.05.029 2023-02-10T11:42:35Z A 106-m long sediment sequence from the maar lake Laguna Potrok Aike in southern Patagonia was recovered in the framework of the International Continental Scientific Drilling Program (ICDP) Potrok Aike maar lake Sediment Archive Drilling prOject (PASADO). About half of the sedimentary sequence is composed of mass movement deposits (MMDs) and the event-corrected record reaches back to 51,200 cal BP. Here we present a high-resolution rock-magnetic study revealing two sedimentary facies associated with MMDs and characterized by two different types of spurious gyroremanent magnetization (GRM) acquired during static alternating field demagnetization. The first rock-magnetic signature is detected in MMDs composed of reworked sand and tephra material. The signature consists of GRM acquired during demagnetization of the natural remanent magnetization (NRM) and other rock-magnetic properties typical of iron sulfides such as greigite. We interpret these intervals as authigenic formation of iron sulfides in suboxic conditions within the MMD. The second rock-magnetic signature consists of a series of 10 short intervals located on the top of MMDs characterized by GRM acquisition during demagnetization of the isothermal remanent magnetization (IRM). Based on geological, limnological, stratigraphic and climatic evidence these layers are interpreted as reflecting pedogenic hematite and/or goethite brought to the lake by runoff events related to precipitation and permafrost melt. The pedogenic iron minerals mobilized from the catchment most likely settled out of suspension on top of MMDs after a rapid remobilization event. The series of runoff events corresponds to periods of increased lacustrine productivity in Laguna Potrok Aike and are coeval within the limit of the chronology to warm periods of the Last Glacial as recorded in Antarctica, the deglaciation in the mid-latitudes of the Southern Hemisphere and enhanced precipitation during the Early Holocene in southeastern Patagonia. Article in Journal/Newspaper Antarc* Antarctica permafrost Institut national de la recherche scientifique, Québec: Espace INRS Patagonia First Rock ENVELOPE(-36.114,-36.114,-54.922,-54.922) Quaternary Science Reviews 98 110 125 |
institution |
Open Polar |
collection |
Institut national de la recherche scientifique, Québec: Espace INRS |
op_collection_id |
ftinrsquebec |
language |
unknown |
topic |
rock magnetism Laguna Potrok Aike lacustrine sediment paleoenvironment mass movement deposit gyroremanent magnetization |
spellingShingle |
rock magnetism Laguna Potrok Aike lacustrine sediment paleoenvironment mass movement deposit gyroremanent magnetization Lisé-Pronovost, Agathe St-Onge, Guillaume Gogorza, Claudia Jouve, Guillaume Francus, Pierre Zolitschka, Bernd Rock-magnetic signature of precipitation and extreme runoff events in south-eastern Patagonia since 51,200 cal BP from the sediments of Laguna Potrok Aike. |
topic_facet |
rock magnetism Laguna Potrok Aike lacustrine sediment paleoenvironment mass movement deposit gyroremanent magnetization |
description |
A 106-m long sediment sequence from the maar lake Laguna Potrok Aike in southern Patagonia was recovered in the framework of the International Continental Scientific Drilling Program (ICDP) Potrok Aike maar lake Sediment Archive Drilling prOject (PASADO). About half of the sedimentary sequence is composed of mass movement deposits (MMDs) and the event-corrected record reaches back to 51,200 cal BP. Here we present a high-resolution rock-magnetic study revealing two sedimentary facies associated with MMDs and characterized by two different types of spurious gyroremanent magnetization (GRM) acquired during static alternating field demagnetization. The first rock-magnetic signature is detected in MMDs composed of reworked sand and tephra material. The signature consists of GRM acquired during demagnetization of the natural remanent magnetization (NRM) and other rock-magnetic properties typical of iron sulfides such as greigite. We interpret these intervals as authigenic formation of iron sulfides in suboxic conditions within the MMD. The second rock-magnetic signature consists of a series of 10 short intervals located on the top of MMDs characterized by GRM acquisition during demagnetization of the isothermal remanent magnetization (IRM). Based on geological, limnological, stratigraphic and climatic evidence these layers are interpreted as reflecting pedogenic hematite and/or goethite brought to the lake by runoff events related to precipitation and permafrost melt. The pedogenic iron minerals mobilized from the catchment most likely settled out of suspension on top of MMDs after a rapid remobilization event. The series of runoff events corresponds to periods of increased lacustrine productivity in Laguna Potrok Aike and are coeval within the limit of the chronology to warm periods of the Last Glacial as recorded in Antarctica, the deglaciation in the mid-latitudes of the Southern Hemisphere and enhanced precipitation during the Early Holocene in southeastern Patagonia. |
format |
Article in Journal/Newspaper |
author |
Lisé-Pronovost, Agathe St-Onge, Guillaume Gogorza, Claudia Jouve, Guillaume Francus, Pierre Zolitschka, Bernd |
author_facet |
Lisé-Pronovost, Agathe St-Onge, Guillaume Gogorza, Claudia Jouve, Guillaume Francus, Pierre Zolitschka, Bernd |
author_sort |
Lisé-Pronovost, Agathe |
title |
Rock-magnetic signature of precipitation and extreme runoff events in south-eastern Patagonia since 51,200 cal BP from the sediments of Laguna Potrok Aike. |
title_short |
Rock-magnetic signature of precipitation and extreme runoff events in south-eastern Patagonia since 51,200 cal BP from the sediments of Laguna Potrok Aike. |
title_full |
Rock-magnetic signature of precipitation and extreme runoff events in south-eastern Patagonia since 51,200 cal BP from the sediments of Laguna Potrok Aike. |
title_fullStr |
Rock-magnetic signature of precipitation and extreme runoff events in south-eastern Patagonia since 51,200 cal BP from the sediments of Laguna Potrok Aike. |
title_full_unstemmed |
Rock-magnetic signature of precipitation and extreme runoff events in south-eastern Patagonia since 51,200 cal BP from the sediments of Laguna Potrok Aike. |
title_sort |
rock-magnetic signature of precipitation and extreme runoff events in south-eastern patagonia since 51,200 cal bp from the sediments of laguna potrok aike. |
publishDate |
2014 |
url |
https://espace.inrs.ca/id/eprint/3622/ https://doi.org/10.1016/j.quascirev.2014.05.029 |
long_lat |
ENVELOPE(-36.114,-36.114,-54.922,-54.922) |
geographic |
Patagonia First Rock |
geographic_facet |
Patagonia First Rock |
genre |
Antarc* Antarctica permafrost |
genre_facet |
Antarc* Antarctica permafrost |
op_relation |
Lisé-Pronovost, Agathe, St-Onge, Guillaume, Gogorza, Claudia, Jouve, Guillaume, Francus, Pierre et Zolitschka, Bernd (2014). Rock-magnetic signature of precipitation and extreme runoff events in south-eastern Patagonia since 51,200 cal BP from the sediments of Laguna Potrok Aike. Quaternary Science Reviews , vol. 98 . p. 110-125. DOI:10.1016/j.quascirev.2014.05.029 <https://doi.org/10.1016/j.quascirev.2014.05.029>. doi:10.1016/j.quascirev.2014.05.029 |
op_doi |
https://doi.org/10.1016/j.quascirev.2014.05.029 |
container_title |
Quaternary Science Reviews |
container_volume |
98 |
container_start_page |
110 |
op_container_end_page |
125 |
_version_ |
1766257103001878528 |