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Artículo

Multiple geophysical methods examining neotectonic blind structures in the Maradona valley, Central Precordillera (Argentina)

Lara Ferrero, Gabriela CristinaIcon ; Lince Klinger, Federico GustavoIcon ; Perucca, Laura Patricia A.Icon ; Rojo, Guillermo; Vargas, Nicolás; Leiva, Flavia
Fecha de publicación: 08/2017
Editorial: Elsevier Science
Revista: Tectonophysics
ISSN: 0040-1951
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Geología; Geoquímica y Geofísica

Resumen

A high-resolution superficial geophysical study was carried out in an area of the retroarc region of the Andes mountains, located in the southwest of San Juan Province (31°45′ S, 68°50′ W), Central Precordillera of Argentina. The main objectives of this study were to confirm the presence of blind neotectonic structures and characterize them by observing variations in magnetic susceptibility, density and p-wave velocities. Geological evidence demonstrates the existence of a neotectonic fault scarps affecting Quaternary alluvial deposits in eastern piedmont of de Las Osamentas range, in addition to direct observation of the cinematic of this feature in several natural exposures. The Maradona valley is characterized by the imbricated eastern-vergence Maradona Fault System that uplifts Neogene sedimentary rocks (Albarracín Formation) over Quaternary (Late Pleistocene-Holocene) alluvial deposits. The combined application of different geophysical methods has allowed the characterization of a blind fault geometry also identified on a natural exposure. The magnetic data added to the gravimetric model, and its integration with a seismic profile clearly shows the existence of an anomalous zone, interpreted as uplifted blocks of Miocene sedimentary rocks of Formation Albarracín displaced over Quaternary deposits. The application and development of different geophysical methods, together with geological studies allow to significantly improving the knowledge of an area affected by Quaternary tectonic activity. Finally, this multidisciplinary study, applied in active blind structures is very relevant for future seismic hazard analysis on areas located very close to populated centers.
Palabras clave: Gravimetric , Magnetometric , Neotectonic , Seismic , Thrust
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/64414
DOI: https://dx.doi.org/10.1016/j.tecto.2017.06.021
URL: https://linkinghub.elsevier.com/retrieve/pii/S0040195117302664
Colecciones
Articulos(CIGEOBIO)
Articulos de CENTRO DE INVESTIGACIONES DE LA GEOSFERA Y BIOSFERA
Citación
Lara Ferrero, Gabriela Cristina; Lince Klinger, Federico Gustavo; Perucca, Laura Patricia A.; Rojo, Guillermo; Vargas, Nicolás; et al.; Multiple geophysical methods examining neotectonic blind structures in the Maradona valley, Central Precordillera (Argentina); Elsevier Science; Tectonophysics; 712-713; 8-2017; 634-642
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