Geomechanical model for a seismically active geothermal field: Insights from the Tinguiririca volcanic-hydrothermal system |
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Authors: | L. Giambiagi P. Álvarez S. Spagnotto E. Godoy A. Lossada J. Mescua M. Barrionuevo J. Suriano |
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Affiliation: | 1. IANIGLA, CCT Mendoza, CONICET, Parque San Martín s/n, 5500, Mendoza, Argentina;2. TEHEMA S.A., Subercaseaux 4100, Pirque, Chile;3. Universidad Nacional de San Luis, Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina;4. Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, Instituto de Estudios Andinos (IDEAN), Facultad de Ciencias Exactas y Naturales, Buenos Aires, Argentina;5. Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Cuyo, Argentina |
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Abstract: | In this work, we develop a multidisciplinary approach to investigate a geothermal system located at the volcanic arc of a subduction-related orogen and highlight the interplay between active tectonism, stress field and fluid migration. By using results of field investigations from the Tinguiririca geothermal field in the High Andes of Chile (35°S), empirical analysis, and numerical models of static stress variations, we proposed a geomechanical model for evaluating the distribution of hydrothermal manifestations in a seismically-active region. The present geomechanical model follows four major steps: (1) development of the 3D structural model of fault pattern; (2) estimation of the in-situ stress field; (3) calculation of the resolved-shear-to-normal-stress ratio (slip tendency) on each fault with varying geomechanical parameters (coefficient of friction, pore pressure and cohesion) as inputs; and (4) estimation of Coulomb static stress changes as a consequence of failure in a nearby fault. Through combination of all these analyses, we characterize in detail both the active deformation in the geothermal field and its relationship with hot fluid migration. |
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Keywords: | Corresponding author. Southern central Andes Paleostress analysis Fluid migration Coulomb static stress change |
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