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A magnetotelluric study in the southern Chilean Andes

Long‐period magnetotelluric investigations were carried out along two transects traversing the Southern Chilean Andes from the Pacific Ocean until the Argentinian border near latitude 39°S to study the mid‐ and deep‐crustal distribution of electrical conductivity. Dimensionality analysis showed that the MT data may be regarded as 2‐D with the exception of areas in the Longitudinal Valley and the region east of the volcanic chain; a subsequent multi‐site decomposition of magnetotelluric impedances yielded approx. N‐S regional strike directions for most parts of the two profiles. First 2‐D inversion revealed a zone of moderately high conductivities (approx. 0.1 S/m) in the deep crust below the active volcanic arc, extending eastwards to the Argentinian border. Inversion results of both profiles are very similar, except of a good mid‐crustal conductor in the Longitudinal Valley, which only appears in the north and may image a fault zone running obliquely to the main South Andean structures.