Basement geometry and sediment thickness of Lago Fagnano (Tierra del Fuego)

Lago Fagnano, an E-W elongated basin located in the central part of Isla Grande de Tierra del Fuego, occupies a structural depression originated along a segment of the Magallanes-Fagnano fault system. Its evolution was mostly conditioned by tectonic processes, and later was affected by glacial and g...

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Autores principales:	Damián Esteban,Federico, Tassone,Alejandro, Lodolo,Emanuele, Menichetti,Marco, Lippai,Horacio, Waldmann,Nicolas, Darbo,Alexia, Baradello,Luca, Vilas,Juan F
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2014
Materias:	Magallanes-Fagnano Fault System Single-channel Seismic Profiles Basement geometry Sedimentary cover
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062014000200002
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spelling	oai:scielo:S0718-710620140002000022015-10-30Basement geometry and sediment thickness of Lago Fagnano (Tierra del Fuego)Damián Esteban,FedericoTassone,AlejandroLodolo,EmanueleMenichetti,MarcoLippai,HoracioWaldmann,NicolasDarbo,AlexiaBaradello,LucaVilas,Juan F Magallanes-Fagnano Fault System Single-channel Seismic Profiles Basement geometry Sedimentary cover Lago Fagnano, an E-W elongated basin located in the central part of Isla Grande de Tierra del Fuego, occupies a structural depression originated along a segment of the Magallanes-Fagnano fault system. Its evolution was mostly conditioned by tectonic processes, and later was affected by glacial and glacio-lacustrine depositional events. New high-resolution single-channel seismic data, integrated with previous seismic profiles, and geological information acquired in the surroundings of the Lago Fagnano, allows us reconstructing the basement surface of the lake, and the geometry, distribution, and thickness of the glacial and glacio-lacustrine sequences. We recognized three main sub-basins within the Lago Fagnano: 1. a medium-size (ca. 21x5 km), deep (373 m), and asymmetric basin to the east; 2. an E-W trending (44x3 km), shallower (150 m) central sub-basin; and 3. a smaller (3.5x1.3 km), shallow (128 m) sub-basin to the west. The isopach sediment map shows that the most pronounced deposition occurred along the E-W axis of the lake, with a gradual increase in thickness towards east (from 100 to 150 m). The glacial deposits are widespread along the basin. The lacustrine sediments are preferentially localized along the E-W axis of the lake filling topographic lows. The shape of the sub-basins and their location in relation with the Magallanes-Fagnano fault system, along with the distribution, geometry, and thickness of the sedimentary units, show that the general morphology of the Lago Fagnano was mostly controlled by pre-existing and syntectonic features. Based on the structural data observed in the outcrops around the Lago Fagnano and the geophysical data, we proposed that the lake is composed by 4 amalgamated pull-apart sub-basins.info:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Andean geology v.41 n.2 20142014-05-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062014000200002en10.5027/andgeoV41n2-a02
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Magallanes-Fagnano Fault System Single-channel Seismic Profiles Basement geometry Sedimentary cover
spellingShingle	Magallanes-Fagnano Fault System Single-channel Seismic Profiles Basement geometry Sedimentary cover Damián Esteban,Federico Tassone,Alejandro Lodolo,Emanuele Menichetti,Marco Lippai,Horacio Waldmann,Nicolas Darbo,Alexia Baradello,Luca Vilas,Juan F Basement geometry and sediment thickness of Lago Fagnano (Tierra del Fuego)
description	Lago Fagnano, an E-W elongated basin located in the central part of Isla Grande de Tierra del Fuego, occupies a structural depression originated along a segment of the Magallanes-Fagnano fault system. Its evolution was mostly conditioned by tectonic processes, and later was affected by glacial and glacio-lacustrine depositional events. New high-resolution single-channel seismic data, integrated with previous seismic profiles, and geological information acquired in the surroundings of the Lago Fagnano, allows us reconstructing the basement surface of the lake, and the geometry, distribution, and thickness of the glacial and glacio-lacustrine sequences. We recognized three main sub-basins within the Lago Fagnano: 1. a medium-size (ca. 21x5 km), deep (373 m), and asymmetric basin to the east; 2. an E-W trending (44x3 km), shallower (150 m) central sub-basin; and 3. a smaller (3.5x1.3 km), shallow (128 m) sub-basin to the west. The isopach sediment map shows that the most pronounced deposition occurred along the E-W axis of the lake, with a gradual increase in thickness towards east (from 100 to 150 m). The glacial deposits are widespread along the basin. The lacustrine sediments are preferentially localized along the E-W axis of the lake filling topographic lows. The shape of the sub-basins and their location in relation with the Magallanes-Fagnano fault system, along with the distribution, geometry, and thickness of the sedimentary units, show that the general morphology of the Lago Fagnano was mostly controlled by pre-existing and syntectonic features. Based on the structural data observed in the outcrops around the Lago Fagnano and the geophysical data, we proposed that the lake is composed by 4 amalgamated pull-apart sub-basins.
author	Damián Esteban,Federico Tassone,Alejandro Lodolo,Emanuele Menichetti,Marco Lippai,Horacio Waldmann,Nicolas Darbo,Alexia Baradello,Luca Vilas,Juan F
author_facet	Damián Esteban,Federico Tassone,Alejandro Lodolo,Emanuele Menichetti,Marco Lippai,Horacio Waldmann,Nicolas Darbo,Alexia Baradello,Luca Vilas,Juan F
author_sort	Damián Esteban,Federico
title	Basement geometry and sediment thickness of Lago Fagnano (Tierra del Fuego)
title_short	Basement geometry and sediment thickness of Lago Fagnano (Tierra del Fuego)
title_full	Basement geometry and sediment thickness of Lago Fagnano (Tierra del Fuego)
title_fullStr	Basement geometry and sediment thickness of Lago Fagnano (Tierra del Fuego)
title_full_unstemmed	Basement geometry and sediment thickness of Lago Fagnano (Tierra del Fuego)
title_sort	basement geometry and sediment thickness of lago fagnano (tierra del fuego)
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2014
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062014000200002
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_version_	1714205845045116928

Basement geometry and sediment thickness of Lago Fagnano (Tierra del Fuego)

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