Late Pleistocene glaciolacustrine MIS 3 record at Fagnano Lake, Central Tierra del Fuego, southern Argentina
Abstract A late Pleistocene glaciolacustrine record was studied at Fagnano Lake (54°35´S, 67°20´W), central Isla Grande de Tierra del Fuego, southernmost South America. Two profiles from the Río Valdéz outcrop were collected for isotopic, geochemical, sedimentological, and geophysical analyses. The...
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Language: | English |
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Cambridge University Press (CUP)
2020
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Online Access: | http://dx.doi.org/10.1017/qua.2020.93 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589420000939 |
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crcambridgeupr:10.1017/qua.2020.93 2024-05-19T07:42:11+00:00 Late Pleistocene glaciolacustrine MIS 3 record at Fagnano Lake, Central Tierra del Fuego, southern Argentina Sanci, Romina Orgeira, María J. Coronato, Andrea Tófalo, Rita Panarello, Héctor O. Quiroga, Diego López, Ramiro Palermo, Pedro Gogorza, Claudia S. 2020 http://dx.doi.org/10.1017/qua.2020.93 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589420000939 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research page 1-15 ISSN 0033-5894 1096-0287 journal-article 2020 crcambridgeupr https://doi.org/10.1017/qua.2020.93 2024-05-02T06:50:52Z Abstract A late Pleistocene glaciolacustrine record was studied at Fagnano Lake (54°35´S, 67°20´W), central Isla Grande de Tierra del Fuego, southernmost South America. Two profiles from the Río Valdéz outcrop were collected for isotopic, geochemical, sedimentological, and geophysical analyses. The sedimentological characteristics, such as rhythmites, presence of dropstones, absence of fossil record, and scarce presence of organic matter, suggest deposition in an ice-contact lake, possibly dammed by the Fagnano paleoglacier. Organic matter of C3 plant origin suggests certain cold and wet conditions. A chronology of the late Pleistocene outcrop was obtained from five 14 C ages resulting in an age-depth model. The time span covered 49.01 cal ka BP to 32.14 cal ka BP. Based on the thickness of the deposit and the calculated average sedimentation rate, the glacial environment could have been present in the study area prior to the last glacial maximum, in agreement with the Inútil-San Sebastián paleoglacier. Both glaciers flowed from the same mountain ice sheet in the Darwin Cordillera, which makes it possible to infer a different behavior of this ice cap from those of the Patagonian Andes, perhaps forced by different atmospheric dynamics and proximity to the wet and cold subantarctic air masses. Article in Journal/Newspaper Ice Sheet Tierra del Fuego Cambridge University Press Quaternary Research 1 15 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract A late Pleistocene glaciolacustrine record was studied at Fagnano Lake (54°35´S, 67°20´W), central Isla Grande de Tierra del Fuego, southernmost South America. Two profiles from the Río Valdéz outcrop were collected for isotopic, geochemical, sedimentological, and geophysical analyses. The sedimentological characteristics, such as rhythmites, presence of dropstones, absence of fossil record, and scarce presence of organic matter, suggest deposition in an ice-contact lake, possibly dammed by the Fagnano paleoglacier. Organic matter of C3 plant origin suggests certain cold and wet conditions. A chronology of the late Pleistocene outcrop was obtained from five 14 C ages resulting in an age-depth model. The time span covered 49.01 cal ka BP to 32.14 cal ka BP. Based on the thickness of the deposit and the calculated average sedimentation rate, the glacial environment could have been present in the study area prior to the last glacial maximum, in agreement with the Inútil-San Sebastián paleoglacier. Both glaciers flowed from the same mountain ice sheet in the Darwin Cordillera, which makes it possible to infer a different behavior of this ice cap from those of the Patagonian Andes, perhaps forced by different atmospheric dynamics and proximity to the wet and cold subantarctic air masses. |
format |
Article in Journal/Newspaper |
author |
Sanci, Romina Orgeira, María J. Coronato, Andrea Tófalo, Rita Panarello, Héctor O. Quiroga, Diego López, Ramiro Palermo, Pedro Gogorza, Claudia S. |
spellingShingle |
Sanci, Romina Orgeira, María J. Coronato, Andrea Tófalo, Rita Panarello, Héctor O. Quiroga, Diego López, Ramiro Palermo, Pedro Gogorza, Claudia S. Late Pleistocene glaciolacustrine MIS 3 record at Fagnano Lake, Central Tierra del Fuego, southern Argentina |
author_facet |
Sanci, Romina Orgeira, María J. Coronato, Andrea Tófalo, Rita Panarello, Héctor O. Quiroga, Diego López, Ramiro Palermo, Pedro Gogorza, Claudia S. |
author_sort |
Sanci, Romina |
title |
Late Pleistocene glaciolacustrine MIS 3 record at Fagnano Lake, Central Tierra del Fuego, southern Argentina |
title_short |
Late Pleistocene glaciolacustrine MIS 3 record at Fagnano Lake, Central Tierra del Fuego, southern Argentina |
title_full |
Late Pleistocene glaciolacustrine MIS 3 record at Fagnano Lake, Central Tierra del Fuego, southern Argentina |
title_fullStr |
Late Pleistocene glaciolacustrine MIS 3 record at Fagnano Lake, Central Tierra del Fuego, southern Argentina |
title_full_unstemmed |
Late Pleistocene glaciolacustrine MIS 3 record at Fagnano Lake, Central Tierra del Fuego, southern Argentina |
title_sort |
late pleistocene glaciolacustrine mis 3 record at fagnano lake, central tierra del fuego, southern argentina |
publisher |
Cambridge University Press (CUP) |
publishDate |
2020 |
url |
http://dx.doi.org/10.1017/qua.2020.93 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589420000939 |
genre |
Ice Sheet Tierra del Fuego |
genre_facet |
Ice Sheet Tierra del Fuego |
op_source |
Quaternary Research page 1-15 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/qua.2020.93 |
container_title |
Quaternary Research |
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1 |
op_container_end_page |
15 |
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1799481838358495232 |