Gravity map of the Isla Grande de Tierra del Fuego, and morphology of Lago Fagnano

Autores
Lodolo, Emanuele; Lippai, Horacio Francisco; Tassone, Alejandro; Zanolla, Claudio; Menichetti, Marco; Hormaechea, José Luis
Año de publicación
2007
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
A complete Bouguer gravity map of the central-eastern part of the Isla Grande de Tierra del Fuego, and a general bathymetric chart of the Lago Fagnano have been realized, on the basis of a series of field geophysical surveys carried out on the Island since 1998. The regional gravity anomaly trend onshore shows a progressive negative gradient from N to S. Distinct, broadly E-W-trending gravity minima are superimposed on this regional negative gradient. They follow the main trace of the Magallanes-Fagnano fault system, which represents the western segment of the left-lateral South America-Scotia transform plate boundary. The gravity minima reflect the presence in the subsurface of restricted and elongated basins developed within the principal displacement zone of the fault system. A relative positive gravity maximum is located just at the SE corner of the Lago Fagnano, and represents the response of a partially exposed crystalline body, occupying an area 3 x 3 km wide. A 2D vertical crustal model has been constructed, combining gravity data inversion and geological information available for the central-eastern region of Lago Fagnano. The bathymetric map of the Lago Fagnano delineates the main morphological features of this 110-km-long, 7-km-wide lake, the largest of Isla Grande. The floor is divided into distinct parts, which suggests that the basin is composed of different sub-basins. In most areas, the basin floor is highly asymmetric in shape, with flat depocentral areas. The most pronounced asymmetry of the basin is seen in the eastern end of the lake, where there is also the deepest depression. The steeper slope of the basin, along the northern shore of the Lago Fagnano, also coincides with the most pronounced regional topographic gradient. The general gravimetric and morphological features of the investigated region are here discussed.
Facultad de Ciencias Astronómicas y Geofísicas
Materia
Geofísica
Tierra del Fuego Island
Bouguer gravity map
Lago Fagnano bathymetry
Gravity model
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/159474

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spelling Gravity map of the Isla Grande de Tierra del Fuego, and morphology of Lago FagnanoLodolo, EmanueleLippai, Horacio FranciscoTassone, AlejandroZanolla, ClaudioMenichetti, MarcoHormaechea, José LuisGeofísicaTierra del Fuego IslandBouguer gravity mapLago Fagnano bathymetryGravity modelA complete Bouguer gravity map of the central-eastern part of the Isla Grande de Tierra del Fuego, and a general bathymetric chart of the Lago Fagnano have been realized, on the basis of a series of field geophysical surveys carried out on the Island since 1998. The regional gravity anomaly trend onshore shows a progressive negative gradient from N to S. Distinct, broadly E-W-trending gravity minima are superimposed on this regional negative gradient. They follow the main trace of the Magallanes-Fagnano fault system, which represents the western segment of the left-lateral South America-Scotia transform plate boundary. The gravity minima reflect the presence in the subsurface of restricted and elongated basins developed within the principal displacement zone of the fault system. A relative positive gravity maximum is located just at the SE corner of the Lago Fagnano, and represents the response of a partially exposed crystalline body, occupying an area 3 x 3 km wide. A 2D vertical crustal model has been constructed, combining gravity data inversion and geological information available for the central-eastern region of Lago Fagnano. The bathymetric map of the Lago Fagnano delineates the main morphological features of this 110-km-long, 7-km-wide lake, the largest of Isla Grande. The floor is divided into distinct parts, which suggests that the basin is composed of different sub-basins. In most areas, the basin floor is highly asymmetric in shape, with flat depocentral areas. The most pronounced asymmetry of the basin is seen in the eastern end of the lake, where there is also the deepest depression. The steeper slope of the basin, along the northern shore of the Lago Fagnano, also coincides with the most pronounced regional topographic gradient. The general gravimetric and morphological features of the investigated region are here discussed.Facultad de Ciencias Astronómicas y Geofísicas2007info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf307-314http://sedici.unlp.edu.ar/handle/10915/159474enginfo:eu-repo/semantics/altIdentifier/url/https://raco.cat/index.php/GeologicaActa/article/view/82438info:eu-repo/semantics/altIdentifier/issn/1695-6133info:eu-repo/semantics/altIdentifier/issn/1696-5728info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:41:41Zoai:sedici.unlp.edu.ar:10915/159474Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:41:41.532SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Gravity map of the Isla Grande de Tierra del Fuego, and morphology of Lago Fagnano
title Gravity map of the Isla Grande de Tierra del Fuego, and morphology of Lago Fagnano
spellingShingle Gravity map of the Isla Grande de Tierra del Fuego, and morphology of Lago Fagnano
Lodolo, Emanuele
Geofísica
Tierra del Fuego Island
Bouguer gravity map
Lago Fagnano bathymetry
Gravity model
title_short Gravity map of the Isla Grande de Tierra del Fuego, and morphology of Lago Fagnano
title_full Gravity map of the Isla Grande de Tierra del Fuego, and morphology of Lago Fagnano
title_fullStr Gravity map of the Isla Grande de Tierra del Fuego, and morphology of Lago Fagnano
title_full_unstemmed Gravity map of the Isla Grande de Tierra del Fuego, and morphology of Lago Fagnano
title_sort Gravity map of the Isla Grande de Tierra del Fuego, and morphology of Lago Fagnano
dc.creator.none.fl_str_mv Lodolo, Emanuele
Lippai, Horacio Francisco
Tassone, Alejandro
Zanolla, Claudio
Menichetti, Marco
Hormaechea, José Luis
author Lodolo, Emanuele
author_facet Lodolo, Emanuele
Lippai, Horacio Francisco
Tassone, Alejandro
Zanolla, Claudio
Menichetti, Marco
Hormaechea, José Luis
author_role author
author2 Lippai, Horacio Francisco
Tassone, Alejandro
Zanolla, Claudio
Menichetti, Marco
Hormaechea, José Luis
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Geofísica
Tierra del Fuego Island
Bouguer gravity map
Lago Fagnano bathymetry
Gravity model
topic Geofísica
Tierra del Fuego Island
Bouguer gravity map
Lago Fagnano bathymetry
Gravity model
dc.description.none.fl_txt_mv A complete Bouguer gravity map of the central-eastern part of the Isla Grande de Tierra del Fuego, and a general bathymetric chart of the Lago Fagnano have been realized, on the basis of a series of field geophysical surveys carried out on the Island since 1998. The regional gravity anomaly trend onshore shows a progressive negative gradient from N to S. Distinct, broadly E-W-trending gravity minima are superimposed on this regional negative gradient. They follow the main trace of the Magallanes-Fagnano fault system, which represents the western segment of the left-lateral South America-Scotia transform plate boundary. The gravity minima reflect the presence in the subsurface of restricted and elongated basins developed within the principal displacement zone of the fault system. A relative positive gravity maximum is located just at the SE corner of the Lago Fagnano, and represents the response of a partially exposed crystalline body, occupying an area 3 x 3 km wide. A 2D vertical crustal model has been constructed, combining gravity data inversion and geological information available for the central-eastern region of Lago Fagnano. The bathymetric map of the Lago Fagnano delineates the main morphological features of this 110-km-long, 7-km-wide lake, the largest of Isla Grande. The floor is divided into distinct parts, which suggests that the basin is composed of different sub-basins. In most areas, the basin floor is highly asymmetric in shape, with flat depocentral areas. The most pronounced asymmetry of the basin is seen in the eastern end of the lake, where there is also the deepest depression. The steeper slope of the basin, along the northern shore of the Lago Fagnano, also coincides with the most pronounced regional topographic gradient. The general gravimetric and morphological features of the investigated region are here discussed.
Facultad de Ciencias Astronómicas y Geofísicas
description A complete Bouguer gravity map of the central-eastern part of the Isla Grande de Tierra del Fuego, and a general bathymetric chart of the Lago Fagnano have been realized, on the basis of a series of field geophysical surveys carried out on the Island since 1998. The regional gravity anomaly trend onshore shows a progressive negative gradient from N to S. Distinct, broadly E-W-trending gravity minima are superimposed on this regional negative gradient. They follow the main trace of the Magallanes-Fagnano fault system, which represents the western segment of the left-lateral South America-Scotia transform plate boundary. The gravity minima reflect the presence in the subsurface of restricted and elongated basins developed within the principal displacement zone of the fault system. A relative positive gravity maximum is located just at the SE corner of the Lago Fagnano, and represents the response of a partially exposed crystalline body, occupying an area 3 x 3 km wide. A 2D vertical crustal model has been constructed, combining gravity data inversion and geological information available for the central-eastern region of Lago Fagnano. The bathymetric map of the Lago Fagnano delineates the main morphological features of this 110-km-long, 7-km-wide lake, the largest of Isla Grande. The floor is divided into distinct parts, which suggests that the basin is composed of different sub-basins. In most areas, the basin floor is highly asymmetric in shape, with flat depocentral areas. The most pronounced asymmetry of the basin is seen in the eastern end of the lake, where there is also the deepest depression. The steeper slope of the basin, along the northern shore of the Lago Fagnano, also coincides with the most pronounced regional topographic gradient. The general gravimetric and morphological features of the investigated region are here discussed.
publishDate 2007
dc.date.none.fl_str_mv 2007
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info:eu-repo/semantics/altIdentifier/issn/1696-5728
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Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
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