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        Understanding the Caviahue-Copahue volcanic complex through kinematic solutions, paleotensors and analogue modelling

        Registro en:
        Vigide N., Yagupsky D., Barcelona H, Agusto M., Caselli A., (2022). Understanding the Caviahue-Copahue volcanic complex through kinematic solutions, paleotensors and analogue modelling. Journal of South American Earth Sciences. https://doi.org/10.1016/j.jsames.2022.104136
        1873-0647
        0895-9811
        http://rid.unrn.edu.ar/handle/20.500.12049/10294
        https://doi.org/10.1016/j.jsames.2022.104136
        https://repositorioslatinoamericanos.uchile.cl/handle/2250/8536430
        Autor
        Vigide, Nicolás
        Yagupsky, Daniel
        Barcelona, Hernan
        Augusto, Mariano
        Caselli, Alberto Tomás
        Institución
        • Universidad Nacional de Río Negro (Argentina)
        Resumen
        Fil: Vigide, Nicolás. Observatorio Argentino de Vigilancia Volcánica (OAVV), Servicio Geológico Minero Argentino (SEGEMAR). Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). Argentina.
         
        Fil: Yagupsky, Daniel. CONICET- IDEAN, Instituto de Estudios Andinos “Don Pablo Groeber”, Universidad de Buenos Aires,. Argentina.
         
        Fil: Barcelona, Hernan. CONICET- IDEAN, Instituto de Estudios Andinos “Don Pablo Groeber”, Universidad de Buenos Aires,. Argentina.
         
        Fil: Augusto, Mariano. CONICET- IDEAN, Instituto de Estudios Andinos “Don Pablo Groeber”, Universidad de Buenos Aires,. Argentina.
         
        Fil: Caselli, Alberto Tomás. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Argentina.
         
        This work aims to study the interaction between two of the most representative structural systems controlling the Caviahue-Copahue volcanic complex. To achieve this objective, a structural analysis based on outcrop-scale fault-slip data field surveys and analogue models were carried out. The deformation regime acting on the studied area was characterized, and the associated paleostresses were obtained from the kinematic data inversion. The performed analysis in Caviahue-Copahue volcanic complex allowed to define two main sets of faults controlling the deformation of the area: NE-SW to ENE-WSW, and WNW-ESE to NW-SE, respectively. The first group comprises high-angle normal faults, resulting in a horst-and-graben setting with along-strike lengths up to 2 km. The second group shows strike-slip kinematics with a minor normal component. These NW-SE faults are related to the Miocene-Pliocene fissure-related volcanism and define the major caldera axis direction. In the geothermal area, the obtained paleostress orientation shows a consistent vertical σ1, denoting a local extensional regime. Regarding the geothermal field, the NE-SW extensional fault system is proposed as the main circulation pathways for hydrothermal fluids rising to the surface. The major NW-SE faults would act as barriers for this circulation. The set of analogous experiments was used to contrast the obtained local structural kinematic results. Two non-coaxial extensional events were established to achieve a local scale approach to the structural configuration observed in the area. Simulations aimed to understand the structural behavior of the superposition of non-coaxial extensive events; they allowed us to assess the role of the different fault sets surveyed in the field within the system. Particularly, our findings support that the NW-SE-oriented structures compartmentalize the subsequent NE-SW-oriented faults, acting on occasions as transfer zones.
         
        true
         
        This work aims to study the interaction between two of the most representative structural systems controlling the Caviahue-Copahue volcanic complex. To achieve this objective, a structural analysis based on outcrop-scale fault-slip data field surveys and analogue models were carried out. The deformation regime acting on the studied area was characterized, and the associated paleostresses were obtained from the kinematic data inversion. The performed analysis in Caviahue-Copahue volcanic complex allowed to define two main sets of faults controlling the deformation of the area: NE-SW to ENE-WSW, and WNW-ESE to NW-SE, respectively. The first group comprises high-angle normal faults, resulting in a horst-and-graben setting with along-strike lengths up to 2 km. The second group shows strike-slip kinematics with a minor normal component. These NW-SE faults are related to the Miocene-Pliocene fissure-related volcanism and define the major caldera axis direction. In the geothermal area, the obtained paleostress orientation shows a consistent vertical σ1, denoting a local extensional regime. Regarding the geothermal field, the NE-SW extensional fault system is proposed as the main circulation pathways for hydrothermal fluids rising to the surface. The major NW-SE faults would act as barriers for this circulation. The set of analogous experiments was used to contrast the obtained local structural kinematic results. Two non-coaxial extensional events were established to achieve a local scale approach to the structural configuration observed in the area. Simulations aimed to understand the structural behavior of the superposition of non-coaxial extensive events; they allowed us to assess the role of the different fault sets surveyed in the field within the system. Particularly, our findings support that the NW-SE-oriented structures compartmentalize the subsequent NE-SW-oriented faults, acting on occasions as transfer zones.
         
        Materias
        Ciencias Exactas y Naturales
        Structural analysis
        Caviahue-copahue volcanic complex
        Fault-plane solutions
        Stress inversion
        Analogue models
        Ciencias Exactas y Naturales

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        Red de Repositorios Latinoamericanos
        + de 8.000.000 publicaciones disponibles
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        Dirección de Servicios de Información y Bibliotecas (SISIB)
        Universidad de Chile
        Red de Repositorios Latinoamericanos | 2006-2018