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Late Pleistocene glaciolacustrine MIS 3 record at Fagnano Lake, Central Tierra del Fuego, southern Argentina

Published online by Cambridge University Press:  14 December 2020

Romina Sanci ,
María J. Orgeira ,
Andrea Coronato ,
Rita Tófalo ,
Héctor O. Panarello ,
Diego Quiroga ,
Ramiro López ,
Pedro Palermo  and
Claudia S. Gogorza
Romina Sanci*
Affiliation:
Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGEBA-CONICET), Facultad de Ciencias Exactas y Naturales (Universidad de Buenos Aires), Intendente Güiraldes 2160, Pabellón II, Piso 1, Ciudad Universitaria (C1428EGA), CABA, Argentina.
María J. Orgeira
Affiliation:
Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGEBA-CONICET), Facultad de Ciencias Exactas y Naturales (Universidad de Buenos Aires), Intendente Güiraldes 2160, Pabellón II, Piso 1, Ciudad Universitaria (C1428EGA), CABA, Argentina.
Andrea Coronato
Affiliation:
Centro Austral de Investigaciones Científicas (CADIC-CONICET), B. Houssay 200 (9410) Ushuaia, Tierra del Fuego, Argentina. Instituto de Ciencias Polares, Ambiente y Recursos Naturales (ICPA-UNTDF), Walanika 250 (9410) Ushuaia, Tierra del Fuego, Argentina.
Rita Tófalo
Affiliation:
Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGEBA-CONICET), Facultad de Ciencias Exactas y Naturales (Universidad de Buenos Aires), Intendente Güiraldes 2160, Pabellón II, Piso 1, Ciudad Universitaria (C1428EGA), CABA, Argentina.
Héctor O. Panarello
Affiliation:
Instituto de Geocronología y Geología Isotópica (INGEIS--CONICET), Facultad de Ciencias Exactas y Naturales (Universidad de Buenos Aires), Intendente Güiraldes 2160, Pabellón INGEIS, Ciudad Universitaria, CABA, Argentina (C1428EGA).
Diego Quiroga
Affiliation:
Centro Austral de Investigaciones Científicas (CADIC-CONICET), B. Houssay 200 (9410) Ushuaia, Tierra del Fuego, Argentina. Instituto de Ciencias Polares, Ambiente y Recursos Naturales (ICPA-UNTDF), Walanika 250 (9410) Ushuaia, Tierra del Fuego, Argentina.
Ramiro López
Affiliation:
Centro Austral de Investigaciones Científicas (CADIC-CONICET), B. Houssay 200 (9410) Ushuaia, Tierra del Fuego, Argentina.
Pedro Palermo
Affiliation:
Instituto De Fisica Arroyo Seco (IFAS), Facultad de Ciencias Exactas, Universidad Nacional del Centro de la provincia de Buenos Aires, Pinto 399 (7000), Tandil, Argentina.
Claudia S. Gogorza
Affiliation:
Instituto De Fisica Arroyo Seco (IFAS), Facultad de Ciencias Exactas, Universidad Nacional del Centro de la provincia de Buenos Aires, Pinto 399 (7000), Tandil, Argentina.
*
*Corresponding author at: E-mail address: [email protected]
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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 14C 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.

Keywords

Glaciolacustrine deposit14C modeled ageC isotopesMIS 3PaleoclimateTierra del Fuego
Type
Thematic Set: Southern Hemisphere Last Glacial Maximum (SHeMax)
Information
Quaternary Research , Volume 102 , July 2021 , pp. 53 - 67
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Copyright
Copyright © University of Washington. Published by Cambridge University Press, 2020

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