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Abstract:

The southern foothills of the Fuegian Andes are bounded by the Beagle Channel (BC), a conspicuous E-W longitudinal basin, controlled by a large transcurrent fault system, which extends from the Atlantic to the Pacific Ocean. The northern shore of the Beagle Channel’s central segment is characterized by several E-W oriented valleys, parallel to the main basin, which are interspersed with a series of oblique NW trending lineaments that extend across the mountain belt. A geoelectrical survey was carried out in order to investigate the shallow architecture of such sets of linear morphologies. The principal E-W lineament system was characterized by conspicuous sub-vertical resistivity contrasts, interpreted as fractured zones associated with fault strands of the main strike-slip Beagle Channel system, whereas the oblique NW-SE trending set of lineaments revealed slightly different resistivity patterns, with vertical displacements and less abrupt contrasts. These resistivity patterns, in combination with the widespread occurrence of normal faulting in the area, allowed to infer an extensional control over the oblique depressions. These morphological features were related to oblique transverse faults that segment two sub parallel E-W fault systems. The oblique faults were probably developed along inherited structural anisotropies and can be extended well beyond the BC shoreline to the NW. Both geophysical and field evidence suggest a post-glacial deformation along the area. © 2018, Servicio Nacional de Geologia y Mineria. All rights reserved.

Registro:

Documento: Artículo
Título:Shallow architecture of fuegian andes lineaments based on electrical resistivity tomography (ERT). evidences of transverse extensional faulting in the central beagle channel area
Autor:Bran, D.M.; Tassone, A.; Menichetti, M.; Cerredo, M.E.; Lozano, J.G.; Lodolo, E.; Vilas, J.F.
Filiación:CONICET-Instituto de Geociencias Básicas, Ambientales y Aplicadas (IGEBA), Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires, C1428EHA, Argentina
Dipartimento di Scienze della Terra, Vita e dell’Ambiente dell, Universita di Urbino, Campus Scientifico E. Mattei, Urbino, FU 61020, Italy
Istituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS), Borgo Grotta Gigante 42/C, Sgonico, Trieste 34010, Italy
Palabras clave:Beagle; ERT; Extension; Lineaments; Transverse Faults; electrical method; electrical resistivity; extensional tectonics; faulting; geophysical survey; lineament; strike-slip fault; structural geology; tomography; Beagle Channel; Tierra del Fuego [(ISG) South America]
Año:2018
Volumen:45
Número:1
Página de inicio:1
Página de fin:34
DOI: http://dx.doi.org/10.5027/andgeov45n1-3002
Título revista:Andean Geology
Título revista abreviado:Andean Geol.
ISSN:07187092
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07187092_v45_n1_p1_Bran

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Citas:

---------- APA ----------
Bran, D.M., Tassone, A., Menichetti, M., Cerredo, M.E., Lozano, J.G., Lodolo, E. & Vilas, J.F. (2018) . Shallow architecture of fuegian andes lineaments based on electrical resistivity tomography (ERT). evidences of transverse extensional faulting in the central beagle channel area . Andean Geology, 45(1), 1-34.
http://dx.doi.org/10.5027/andgeov45n1-3002
---------- CHICAGO ----------
Bran, D.M., Tassone, A., Menichetti, M., Cerredo, M.E., Lozano, J.G., Lodolo, E., et al. "Shallow architecture of fuegian andes lineaments based on electrical resistivity tomography (ERT). evidences of transverse extensional faulting in the central beagle channel area " . Andean Geology 45, no. 1 (2018) : 1-34.
http://dx.doi.org/10.5027/andgeov45n1-3002
---------- MLA ----------
Bran, D.M., Tassone, A., Menichetti, M., Cerredo, M.E., Lozano, J.G., Lodolo, E., et al. "Shallow architecture of fuegian andes lineaments based on electrical resistivity tomography (ERT). evidences of transverse extensional faulting in the central beagle channel area " . Andean Geology, vol. 45, no. 1, 2018, pp. 1-34.
http://dx.doi.org/10.5027/andgeov45n1-3002
---------- VANCOUVER ----------
Bran, D.M., Tassone, A., Menichetti, M., Cerredo, M.E., Lozano, J.G., Lodolo, E., et al. Shallow architecture of fuegian andes lineaments based on electrical resistivity tomography (ERT). evidences of transverse extensional faulting in the central beagle channel area . Andean Geol. 2018;45(1):1-34.
http://dx.doi.org/10.5027/andgeov45n1-3002