Magnetotelluric study in the Los Lagos Region (Chile) to investigate volcano-tectonic processes in the Southern Andes

Abstract To analyze the process of subduction Nazca and South American plates in area Southern Andes, its relationship with tectonic volcanic regime place, magnetotelluric measurements were made through a transversal profile Chilean continental margin. The data-processing stage included analysis dimensional parameters, which as first results showed three-dimensional environment for periods less than 1 s two-dimensional greater 10 s. In addition, geomagnetic transfer function (tipper), presence structural electrical anisotropy was identified data. After analysis, deep resistivity image obtained by inverting 2D 3D model. Surface conductive anomalies beneath central depression related to early dehydration slab serpentinization mantle that coincides location discontinuity regional body we plate. A shallow located around Calbuco volcano correlated magmatic chamber or reservoir turn appears be connected Liquiñe Ofqui fault system Andean Transverse Fault system. addition process, when oceanic crust reaches depth 80–100 km, ascending fluids produced phase changes minerals present plate produce basaltic melts wedge subcontinental give rise an eclogitization this explains large conductivity anomaly main mountain range.