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Abstract:

Aquifer-bearing intermontane sedimentary basins of the Sierras Pampeanas in the northwest of Argentina are in general very deep and narrow and contain economically important deposits of Tertiary sediments. This paper presents the results of a study to characterize the sedimentary basin bounded to the west by Sierra de Famatina and to the east by Sierra de Velasco, where an electromagnetic sensing technique, the magnetotelluric (MT) method, was applied. 12 MT sites were deployed along a 30 km E-W transect. Some of the data collected were used to derive a 2-D resistivity model of the basin. The model shows a subsurface trough with a thick (approximately 8 km) sedimentary sequence above it. Anomalous behaviour of the E-W electric-field component (E(y)) was detected in the period range 1-100 s, where the amplitude of this component was below the instrumental noise level. The cause of this anomaly is not known, but it might be due to the presence of an embedded conducting body between 8 and 10 km, which would give rise to N-S current channelling.

Registro:

Documento: Artículo
Título:Current channelling and three-dimensional effects detected from magnetotelluric data from a sedimentary basin in Sierras Pampeanas, Argentina
Autor:Pomposiello, C.; Osella, A.; Favetto, A.; Sainato, C.; Martinelli, P.; Aprea, C.
Filiación:Ctro. Invest. Recurs. G., CONICET, Ramirez de Velasco 847-1414, Buenos Aires, Argentina
Dto. Física, Fac. de Cie. Exactas y Naturelles, Universidad de Buenos Aires/CONICET, Argentina
Cát. Física, Facultad de Agronomía, Universidad de Buenos Aires, Argentina
Palabras clave:Argentina; Magnetotelluric; Magnetotelluric method; Sedimentary basin; Sierras Pampeanas; magnetotelluric method; sedimentary basin; Argentina
Año:1998
Volumen:135
Número:2
Página de inicio:339
Página de fin:350
DOI: http://dx.doi.org/10.1046/j.1365-246X.1998.00636.x
Título revista:Geophysical Journal International
Título revista abreviado:Geophys. J. Int.
ISSN:0956540X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0956540X_v135_n2_p339_Pomposiello

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Citas:

---------- APA ----------
Pomposiello, C., Osella, A., Favetto, A., Sainato, C., Martinelli, P. & Aprea, C. (1998) . Current channelling and three-dimensional effects detected from magnetotelluric data from a sedimentary basin in Sierras Pampeanas, Argentina. Geophysical Journal International, 135(2), 339-350.
http://dx.doi.org/10.1046/j.1365-246X.1998.00636.x
---------- CHICAGO ----------
Pomposiello, C., Osella, A., Favetto, A., Sainato, C., Martinelli, P., Aprea, C. "Current channelling and three-dimensional effects detected from magnetotelluric data from a sedimentary basin in Sierras Pampeanas, Argentina" . Geophysical Journal International 135, no. 2 (1998) : 339-350.
http://dx.doi.org/10.1046/j.1365-246X.1998.00636.x
---------- MLA ----------
Pomposiello, C., Osella, A., Favetto, A., Sainato, C., Martinelli, P., Aprea, C. "Current channelling and three-dimensional effects detected from magnetotelluric data from a sedimentary basin in Sierras Pampeanas, Argentina" . Geophysical Journal International, vol. 135, no. 2, 1998, pp. 339-350.
http://dx.doi.org/10.1046/j.1365-246X.1998.00636.x
---------- VANCOUVER ----------
Pomposiello, C., Osella, A., Favetto, A., Sainato, C., Martinelli, P., Aprea, C. Current channelling and three-dimensional effects detected from magnetotelluric data from a sedimentary basin in Sierras Pampeanas, Argentina. Geophys. J. Int. 1998;135(2):339-350.
http://dx.doi.org/10.1046/j.1365-246X.1998.00636.x