Current channelling and three-dimensional effects detected from magnetotelluric data from a sedimentary basin in Sierras Pampeanas, Argentina

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 th...

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Detalles Bibliográficos
Autores principales: Pomposiello, C., Osella, A., Favetto, A., Sainato, C., Martinelli, P., Aprea, C.
Formato: JOUR
Materias:
Argentina
Magnetotelluric
Magnetotelluric method
Sedimentary basin
Sierras Pampeanas
magnetotelluric method
sedimentary basin
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_0956540X_v135_n2_p339_Pomposiello
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_0956540X_v135_n2_p339_Pomposiello
record_format dspace
spelling todo:paper_0956540X_v135_n2_p339_Pomposiello2023-10-03T15:52:03Z Current channelling and three-dimensional effects detected from magnetotelluric data from a sedimentary basin in Sierras Pampeanas, Argentina Pomposiello, C. Osella, A. Favetto, A. Sainato, C. Martinelli, P. Aprea, C. Argentina Magnetotelluric Magnetotelluric method Sedimentary basin Sierras Pampeanas magnetotelluric method sedimentary basin Argentina 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0956540X_v135_n2_p339_Pomposiello
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Argentina
Magnetotelluric
Magnetotelluric method
Sedimentary basin
Sierras Pampeanas
magnetotelluric method
sedimentary basin
Argentina
spellingShingle Argentina
Magnetotelluric
Magnetotelluric method
Sedimentary basin
Sierras Pampeanas
magnetotelluric method
sedimentary basin
Argentina
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
topic_facet Argentina
Magnetotelluric
Magnetotelluric method
Sedimentary basin
Sierras Pampeanas
magnetotelluric method
sedimentary basin
Argentina
description 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.
format JOUR
author Pomposiello, C.
Osella, A.
Favetto, A.
Sainato, C.
Martinelli, P.
Aprea, C.
author_facet Pomposiello, C.
Osella, A.
Favetto, A.
Sainato, C.
Martinelli, P.
Aprea, C.
author_sort Pomposiello, C.
title Current channelling and three-dimensional effects detected from magnetotelluric data from a sedimentary basin in Sierras Pampeanas, Argentina
title_short Current channelling and three-dimensional effects detected from magnetotelluric data from a sedimentary basin in Sierras Pampeanas, Argentina
title_full Current channelling and three-dimensional effects detected from magnetotelluric data from a sedimentary basin in Sierras Pampeanas, Argentina
title_fullStr Current channelling and three-dimensional effects detected from magnetotelluric data from a sedimentary basin in Sierras Pampeanas, Argentina
title_full_unstemmed Current channelling and three-dimensional effects detected from magnetotelluric data from a sedimentary basin in Sierras Pampeanas, Argentina
title_sort current channelling and three-dimensional effects detected from magnetotelluric data from a sedimentary basin in sierras pampeanas, argentina
url http://hdl.handle.net/20.500.12110/paper_0956540X_v135_n2_p339_Pomposiello
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AT sainatoc currentchannellingandthreedimensionaleffectsdetectedfrommagnetotelluricdatafromasedimentarybasininsierraspampeanasargentina
AT martinellip currentchannellingandthreedimensionaleffectsdetectedfrommagnetotelluricdatafromasedimentarybasininsierraspampeanasargentina
AT apreac currentchannellingandthreedimensionaleffectsdetectedfrommagnetotelluricdatafromasedimentarybasininsierraspampeanasargentina
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