Conductivity Distribution Beneath the San Pedro‐Linzor Volcanic Chain, North Chile, Using 3‐D Magnetotelluric Modeling. Issue 5 (25th May 2019) - Mancini, Renzo
Abstract: A magnetotelluric study was carried out in the San Pedro‐Linzor volcanic chain, North Chile, to identify possible magmatic structures and hydrothermal systems associated with volcanoes of Holocene activity, considering previous petrochemical studies pointing to crystallization depths of approximately 8 km. Three‐dimensional resistivity models based on magnetotellurics data of the San Pedro‐Linzor volcanic chain were obtained based on broadband data measured in 2017 and 2018, in addition to long‐period data measured in 1990s. The three‐dimensional modeling shows two low‐resistivity zones (less than 10 Ωm) interpreted as partially molten areas below the Chao Dome and the Paniri volcano, and a shallower low resistivity area (less than 5 Ωm) in the Turi Basin, an active hydrothermal system to the southwest of the volcanic chain. Key Points: Magnetotellurics have been used to image the conductivity distribution below a volcanic chain in the Central Andes Magmatic and hydrothermal structures associated with diverse volcanic products along the chain have been inferred 3‐D modeling tools were used considering strong topographic variations of more than 1 km in some areas