A new limit for the NW Río de la plata craton border at about 24ºS (Argentina) detected by magnetotellurics

Mostrar todas las versiones(2)

Old South American structures constitute a puzzle where the Río de la Plata Craton is the most important clue in the assembly of SW Gondwana. The present study is aimed at characterizing the western border of the Río de la Plata Craton on the basis of magnetotelluric studies. Magnetotelluric (MT) da...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Favetto, A., Rocha, V., Pomposiello, C., García, R., Barcelona, H.
Formato: JOUR
Materias:
Formosa
Magnetotelluric
North Argentina
Río de la plata craton
craton
data inversion
electrical resistivity
magnetotelluric method
regional geology
Argentina
Formosa [Argentina]
Rio de la Plata
Salta [Argentina]
Subandean Ranges
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_16956133_v13_n3_p243_Favetto
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_16956133_v13_n3_p243_Favetto
record_format dspace
spelling todo:paper_16956133_v13_n3_p243_Favetto2023-10-03T16:29:57Z A new limit for the NW Río de la plata craton border at about 24ºS (Argentina) detected by magnetotellurics Favetto, A. Rocha, V. Pomposiello, C. García, R. Barcelona, H. Formosa Magnetotelluric North Argentina Río de la plata craton craton data inversion electrical resistivity magnetotelluric method regional geology Argentina Formosa [Argentina] Rio de la Plata Salta [Argentina] Subandean Ranges Old South American structures constitute a puzzle where the Río de la Plata Craton is the most important clue in the assembly of SW Gondwana. The present study is aimed at characterizing the western border of the Río de la Plata Craton on the basis of magnetotelluric studies. Magnetotelluric (MT) data were acquired along an approximately NW-SE 750km profile at about 24ºS, from the Sub-Andean Ranges in the province of Salta (NW) to the Formosa Province frontier (SE) next to Paraguay River. Distortion and structure dimensionality analysis indicates that MT responses are two-dimensional with a NS strike orientation, consistent with the regional geological strike. A 2-D inversion of the data provided a model showing a lateral discontinuity, possibly associated with cratonic structures. The high resistivity observed (>5000ohm·m), from about the middle of the profile toward its eastern end, may be interpreted as the terranes accreted to the Río de la Plata Craton during Neoproterozoic to Cambrian times, or as the Río de la Plata Craton itself. Along the profile from the surface to a depth of about 10km the resistivity model shows a significant resistivity variation in the structure. The resistive block identified at the western end of the profile represents the Sub-Andean system. The markedly enhanced low-resistivity structure (~1 to 10ohm·m) corresponds to a sedimentary pile whose thickness decreases from NW to SE. © 2015, Universitat de Barcelona. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_16956133_v13_n3_p243_Favetto
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Formosa
Magnetotelluric
North Argentina
Río de la plata craton
craton
data inversion
electrical resistivity
magnetotelluric method
regional geology
Argentina
Formosa [Argentina]
Rio de la Plata
Salta [Argentina]
Subandean Ranges
spellingShingle Formosa
Magnetotelluric
North Argentina
Río de la plata craton
craton
data inversion
electrical resistivity
magnetotelluric method
regional geology
Argentina
Formosa [Argentina]
Rio de la Plata
Salta [Argentina]
Subandean Ranges
Favetto, A.
Rocha, V.
Pomposiello, C.
García, R.
Barcelona, H.
A new limit for the NW Río de la plata craton border at about 24ºS (Argentina) detected by magnetotellurics
topic_facet Formosa
Magnetotelluric
North Argentina
Río de la plata craton
craton
data inversion
electrical resistivity
magnetotelluric method
regional geology
Argentina
Formosa [Argentina]
Rio de la Plata
Salta [Argentina]
Subandean Ranges
description Old South American structures constitute a puzzle where the Río de la Plata Craton is the most important clue in the assembly of SW Gondwana. The present study is aimed at characterizing the western border of the Río de la Plata Craton on the basis of magnetotelluric studies. Magnetotelluric (MT) data were acquired along an approximately NW-SE 750km profile at about 24ºS, from the Sub-Andean Ranges in the province of Salta (NW) to the Formosa Province frontier (SE) next to Paraguay River. Distortion and structure dimensionality analysis indicates that MT responses are two-dimensional with a NS strike orientation, consistent with the regional geological strike. A 2-D inversion of the data provided a model showing a lateral discontinuity, possibly associated with cratonic structures. The high resistivity observed (>5000ohm·m), from about the middle of the profile toward its eastern end, may be interpreted as the terranes accreted to the Río de la Plata Craton during Neoproterozoic to Cambrian times, or as the Río de la Plata Craton itself. Along the profile from the surface to a depth of about 10km the resistivity model shows a significant resistivity variation in the structure. The resistive block identified at the western end of the profile represents the Sub-Andean system. The markedly enhanced low-resistivity structure (~1 to 10ohm·m) corresponds to a sedimentary pile whose thickness decreases from NW to SE. © 2015, Universitat de Barcelona. All rights reserved.
format JOUR
author Favetto, A.
Rocha, V.
Pomposiello, C.
García, R.
Barcelona, H.
author_facet Favetto, A.
Rocha, V.
Pomposiello, C.
García, R.
Barcelona, H.
author_sort Favetto, A.
title A new limit for the NW Río de la plata craton border at about 24ºS (Argentina) detected by magnetotellurics
title_short A new limit for the NW Río de la plata craton border at about 24ºS (Argentina) detected by magnetotellurics
title_full A new limit for the NW Río de la plata craton border at about 24ºS (Argentina) detected by magnetotellurics
title_fullStr A new limit for the NW Río de la plata craton border at about 24ºS (Argentina) detected by magnetotellurics
title_full_unstemmed A new limit for the NW Río de la plata craton border at about 24ºS (Argentina) detected by magnetotellurics
title_sort new limit for the nw río de la plata craton border at about 24ºs (argentina) detected by magnetotellurics
url http://hdl.handle.net/20.500.12110/paper_16956133_v13_n3_p243_Favetto
work_keys_str_mv AT favettoa anewlimitforthenwriodelaplatacratonborderatabout24osargentinadetectedbymagnetotellurics
AT rochav anewlimitforthenwriodelaplatacratonborderatabout24osargentinadetectedbymagnetotellurics
AT pomposielloc anewlimitforthenwriodelaplatacratonborderatabout24osargentinadetectedbymagnetotellurics
AT garciar anewlimitforthenwriodelaplatacratonborderatabout24osargentinadetectedbymagnetotellurics
AT barcelonah anewlimitforthenwriodelaplatacratonborderatabout24osargentinadetectedbymagnetotellurics
AT favettoa newlimitforthenwriodelaplatacratonborderatabout24osargentinadetectedbymagnetotellurics
AT rochav newlimitforthenwriodelaplatacratonborderatabout24osargentinadetectedbymagnetotellurics
AT pomposielloc newlimitforthenwriodelaplatacratonborderatabout24osargentinadetectedbymagnetotellurics
AT garciar newlimitforthenwriodelaplatacratonborderatabout24osargentinadetectedbymagnetotellurics
AT barcelonah newlimitforthenwriodelaplatacratonborderatabout24osargentinadetectedbymagnetotellurics
_version_ 1807317514242228224

Ejemplares similares