Gravity map of the Isla Grande de Tierra del Fuego, and morphology of Lago Fagnano
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| Format: | Artículo científico |
| Language: | en |
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Universitat de Barcelona
2007
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| _version_ | 1876475743474548736 |
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| author | M. Menichetti |
| author_facet | M. Menichetti |
| contents | Gravity map of the Isla Grande de Tierra del Fuego, and morphology of Lago Fagnano M. Menichetti A. Tassone E. Lodolo H. Lippai C. Zanolla J. L. Hormaechea Ciencias de la Tierra Gravity model Bouguer gravity map Tierra del Fuego Island Lago Fagnano bathymetry A complete Bouguer gravity map of the central-eastern part of the Isla Grande de Tierra del Fuego, and a generalbathymetric chart of the Lago Fagnano have been realized, on the basis of a series of field geophysical surveys carriedout on the Island since 1998. The regional gravity anomaly trend onshore shows a progressive negative gradientfrom 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 ofthe left-lateral South America-Scotia transform plate boundary. The gravity minima reflect the presence in the subsurfaceof restricted and elongated basins developed within the principal displacement zone of the fault system. Arelative positive gravity maximum is located just at the SE corner of the Lago Fagnano, and represents theresponse of a partially exposed crystalline body, occupying an area 3 x 3 km wide. A 2D vertical crustal model hasbeen constructed, combining gravity data inversion and geological information available for the central-easternregion of Lago Fagnano. The bathymetric map of the Lago Fagnano delineates the main morphological features ofthis 110-km-long, 7-km-wide lake, the largest of Isla Grande. The floor is divided into distinct parts, which suggeststhat the basin is composed of different sub-basins. In most areas, the basin floor is highly asymmetric inshape, with flat depocentral areas. The most pronounced asymmetry of the basin is seen in the eastern end of thelake, where there is also the deepest depression. The steeper slope of the basin, along the northern shore of theLago Fagnano, also coincides with the most pronounced regional topographic gradient. The general gravimetricand morphological features of the investigated region are here discussed 2007 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50550404 en http://www.redalyc.org/revista.oa?id=505 Geologica Acta: an international earth science journal application/pdf Universitat de Barcelona Geologica Acta: an international earth science journal (España) Num.4 Vol.5 |
| format | Artículo científico |
| id | redalyc_50550404 |
| institution | Redalyc |
| language | en |
| publishDate | 2007 |
| publisher | Universitat de Barcelona |
| spellingShingle | Gravity map of the Isla Grande de Tierra del Fuego, and morphology of Lago Fagnano M. Menichetti Ciencias de la Tierra Gravity model Bouguer gravity map Tierra del Fuego Island Lago Fagnano bathymetry Gravity map of the Isla Grande de Tierra del Fuego, and morphology of Lago Fagnano M. Menichetti A. Tassone E. Lodolo H. Lippai C. Zanolla J. L. Hormaechea Ciencias de la Tierra Gravity model Bouguer gravity map Tierra del Fuego Island Lago Fagnano bathymetry A complete Bouguer gravity map of the central-eastern part of the Isla Grande de Tierra del Fuego, and a generalbathymetric chart of the Lago Fagnano have been realized, on the basis of a series of field geophysical surveys carriedout on the Island since 1998. The regional gravity anomaly trend onshore shows a progressive negative gradientfrom 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 ofthe left-lateral South America-Scotia transform plate boundary. The gravity minima reflect the presence in the subsurfaceof restricted and elongated basins developed within the principal displacement zone of the fault system. Arelative positive gravity maximum is located just at the SE corner of the Lago Fagnano, and represents theresponse of a partially exposed crystalline body, occupying an area 3 x 3 km wide. A 2D vertical crustal model hasbeen constructed, combining gravity data inversion and geological information available for the central-easternregion of Lago Fagnano. The bathymetric map of the Lago Fagnano delineates the main morphological features ofthis 110-km-long, 7-km-wide lake, the largest of Isla Grande. The floor is divided into distinct parts, which suggeststhat the basin is composed of different sub-basins. In most areas, the basin floor is highly asymmetric inshape, with flat depocentral areas. The most pronounced asymmetry of the basin is seen in the eastern end of thelake, where there is also the deepest depression. The steeper slope of the basin, along the northern shore of theLago Fagnano, also coincides with the most pronounced regional topographic gradient. The general gravimetricand morphological features of the investigated region are here discussed 2007 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50550404 en http://www.redalyc.org/revista.oa?id=505 Geologica Acta: an international earth science journal application/pdf Universitat de Barcelona Geologica Acta: an international earth science journal (España) Num.4 Vol.5 |
| title | Gravity map of the Isla Grande de Tierra del Fuego, and morphology of Lago Fagnano |
| topic | Ciencias de la Tierra Gravity model Bouguer gravity map Tierra del Fuego Island Lago Fagnano bathymetry |
| url | https://www.redalyc.org/articulo.oa?id=50550404 |