Origin and evolution of lago Yehuin (Tierra del Fuego, Argentina): Results from a geophysical survey

ABSTRACT Lago Yehuin, a WNW-ESE elongated basin located in the outer fold-and-thrust belt of the Fuegian Andes, occupies a compartmented structural depression originated along a segment of the left-lateral Lago Deseado fault system. This paper describes the first geophysical survey performed within...

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Autores principales:	Lozano,Jorge G., Tassone,Alejandro, Lodolo,Emanuele, Menichetti,Marco, Cerredo,María E., Bran,Donaldo M., Esteban,Federico, Ormazabal,Juan P., Baradello,Luca, Vilas,Juan F.
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2018
Materias:	Lago Yehuin Fuegian Andes Single-channel seismic profiles Strike-slip tectonics
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062018000300318
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spelling	oai:scielo:S0718-710620180003003182018-11-05Origin and evolution of lago Yehuin (Tierra del Fuego, Argentina): Results from a geophysical surveyLozano,Jorge G.Tassone,AlejandroLodolo,EmanueleMenichetti,MarcoCerredo,María E.Bran,Donaldo M.Esteban,FedericoOrmazabal,Juan P.Baradello,LucaVilas,Juan F. Lago Yehuin Fuegian Andes Single-channel seismic profiles Strike-slip tectonics ABSTRACT Lago Yehuin, a WNW-ESE elongated basin located in the outer fold-and-thrust belt of the Fuegian Andes, occupies a compartmented structural depression originated along a segment of the left-lateral Lago Deseado fault system. This paper describes the first geophysical survey performed within the lake. New acquired high-resolution single-channel seismic data, integrated with geological information in the surroundings of the Lago Yehuin, allowed to: (i) produce a complete bathymetric map of the lake, (ii) reconstruct the basement surface of the lake, and (iii) analyze the geometry, distribution, and thickness of the sedimentary infill. Two sub-basins were recognized within Lago Yehuin: A western sub-basin, 7.5 km long, with a maximum depth of 118 m; an eastern sub-basin, 7.2 km long with a maximum depth of 80 m. Both sub-basins are limited by a set of normal faults which overprint NE-verging thrusts. Three seismostratigraphic units have been identified in the seismic records: (1) a lower unit with wedged geometry interpreted as a mass flow deposits; (2) a thick (up to 120 m) intermediate unit of glacio-lacustrine nature and irregularly distributed in the Yehuin basin; (3) a thin (generally <10 m) upper lacustrine unit which drapes the entire basin. Lago Yehuin is considered a Neogene basin generated by strike-slip tectonics that was later affected by glacial and glacio-lacustrine deposition. Interpreted submerged ridge moraines within Lago Yehuin are correlated with onland moraine arcs built by the complete recessional paths of Fuego and Ewan ice lobes. A significant structural control is proposed not only for the formation of Lago Yehuin, but also for the general paths of the northern arms of the Fagnano palaeo-glacier.info:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Andean geology v.45 n.3 20182018-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062018000300318en10.5027/andgeov45n3-3085
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Lago Yehuin Fuegian Andes Single-channel seismic profiles Strike-slip tectonics
spellingShingle	Lago Yehuin Fuegian Andes Single-channel seismic profiles Strike-slip tectonics Lozano,Jorge G. Tassone,Alejandro Lodolo,Emanuele Menichetti,Marco Cerredo,María E. Bran,Donaldo M. Esteban,Federico Ormazabal,Juan P. Baradello,Luca Vilas,Juan F. Origin and evolution of lago Yehuin (Tierra del Fuego, Argentina): Results from a geophysical survey
description	ABSTRACT Lago Yehuin, a WNW-ESE elongated basin located in the outer fold-and-thrust belt of the Fuegian Andes, occupies a compartmented structural depression originated along a segment of the left-lateral Lago Deseado fault system. This paper describes the first geophysical survey performed within the lake. New acquired high-resolution single-channel seismic data, integrated with geological information in the surroundings of the Lago Yehuin, allowed to: (i) produce a complete bathymetric map of the lake, (ii) reconstruct the basement surface of the lake, and (iii) analyze the geometry, distribution, and thickness of the sedimentary infill. Two sub-basins were recognized within Lago Yehuin: A western sub-basin, 7.5 km long, with a maximum depth of 118 m; an eastern sub-basin, 7.2 km long with a maximum depth of 80 m. Both sub-basins are limited by a set of normal faults which overprint NE-verging thrusts. Three seismostratigraphic units have been identified in the seismic records: (1) a lower unit with wedged geometry interpreted as a mass flow deposits; (2) a thick (up to 120 m) intermediate unit of glacio-lacustrine nature and irregularly distributed in the Yehuin basin; (3) a thin (generally <10 m) upper lacustrine unit which drapes the entire basin. Lago Yehuin is considered a Neogene basin generated by strike-slip tectonics that was later affected by glacial and glacio-lacustrine deposition. Interpreted submerged ridge moraines within Lago Yehuin are correlated with onland moraine arcs built by the complete recessional paths of Fuego and Ewan ice lobes. A significant structural control is proposed not only for the formation of Lago Yehuin, but also for the general paths of the northern arms of the Fagnano palaeo-glacier.
author	Lozano,Jorge G. Tassone,Alejandro Lodolo,Emanuele Menichetti,Marco Cerredo,María E. Bran,Donaldo M. Esteban,Federico Ormazabal,Juan P. Baradello,Luca Vilas,Juan F.
author_facet	Lozano,Jorge G. Tassone,Alejandro Lodolo,Emanuele Menichetti,Marco Cerredo,María E. Bran,Donaldo M. Esteban,Federico Ormazabal,Juan P. Baradello,Luca Vilas,Juan F.
author_sort	Lozano,Jorge G.
title	Origin and evolution of lago Yehuin (Tierra del Fuego, Argentina): Results from a geophysical survey
title_short	Origin and evolution of lago Yehuin (Tierra del Fuego, Argentina): Results from a geophysical survey
title_full	Origin and evolution of lago Yehuin (Tierra del Fuego, Argentina): Results from a geophysical survey
title_fullStr	Origin and evolution of lago Yehuin (Tierra del Fuego, Argentina): Results from a geophysical survey
title_full_unstemmed	Origin and evolution of lago Yehuin (Tierra del Fuego, Argentina): Results from a geophysical survey
title_sort	origin and evolution of lago yehuin (tierra del fuego, argentina): results from a geophysical survey
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2018
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062018000300318
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Origin and evolution of lago Yehuin (Tierra del Fuego, Argentina): Results from a geophysical survey

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