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

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 on...

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Detalles Bibliográficos
Autores principales: Lodolo, Emanuele, Lippai, Horacio Francisco, Tassone, Alejandro, Zanolla, Claudio, Menichetti, Marco, Hormaechea, José Luis
Formato: Articulo
Lenguaje:Inglés
Publicado: 2007
Materias:
Geofísica
Tierra del Fuego Island
Bouguer gravity map
Lago Fagnano bathymetry
Gravity model
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/159474
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-159474
record_format dspace
spelling I19-R120-10915-1594742023-10-27T20:31:06Z http://sedici.unlp.edu.ar/handle/10915/159474 Gravity map of the Isla Grande de Tierra del Fuego, and morphology of Lago Fagnano Lodolo, Emanuele Lippai, Horacio Francisco Tassone, Alejandro Zanolla, Claudio Menichetti, Marco Hormaechea, José Luis 2007 2023-10-27T13:51:41Z en Geofísica Tierra del Fuego Island Bouguer gravity map Lago Fagnano bathymetry Gravity model 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 Articulo Articulo http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf 307-314
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Geofísica
Tierra del Fuego Island
Bouguer gravity map
Lago Fagnano bathymetry
Gravity model
spellingShingle Geofísica
Tierra del Fuego Island
Bouguer gravity map
Lago Fagnano bathymetry
Gravity model
Lodolo, Emanuele
Lippai, Horacio Francisco
Tassone, Alejandro
Zanolla, Claudio
Menichetti, Marco
Hormaechea, José Luis
Gravity map of the Isla Grande de Tierra del Fuego, and morphology of Lago Fagnano
topic_facet Geofísica
Tierra del Fuego Island
Bouguer gravity map
Lago Fagnano bathymetry
Gravity model
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.
format Articulo
Articulo
author Lodolo, Emanuele
Lippai, Horacio Francisco
Tassone, Alejandro
Zanolla, Claudio
Menichetti, Marco
Hormaechea, José Luis
author_facet Lodolo, Emanuele
Lippai, Horacio Francisco
Tassone, Alejandro
Zanolla, Claudio
Menichetti, Marco
Hormaechea, José Luis
author_sort Lodolo, Emanuele
title Gravity map of the Isla Grande de Tierra del Fuego, and morphology of Lago Fagnano
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
publishDate 2007
url http://sedici.unlp.edu.ar/handle/10915/159474
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