A new limit for the NW Río de la plata craton border at about 24ºS (Argentina) detected by magnetotellurics
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...
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2015
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16956133_v13_n3_p243_Favetto http://hdl.handle.net/20.500.12110/paper_16956133_v13_n3_p243_Favetto |
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paper:paper_16956133_v13_n3_p243_Favetto2023-06-08T16:26:45Z A new limit for the NW Río de la plata craton border at about 24ºS (Argentina) detected by magnetotellurics 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. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16956133_v13_n3_p243_Favetto 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 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. |
| 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 |
| publishDate |
2015 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16956133_v13_n3_p243_Favetto http://hdl.handle.net/20.500.12110/paper_16956133_v13_n3_p243_Favetto |
| _version_ |
1768541817744130048 |