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Deep seismic reprocessing of industrial lines, combined with surface geologic and structural data, provides the basis of a new tectonic interpretation of the northern Sierras Pampeanas at 27°S latitude. These basement mountain blocks, uplifted during an episode of shallowing of the subduction zone, show an active double-wedge thrusting. Deep seismic data indicate the different vergences of the western and eastern sectors of the Sierra de Aconquija, in the western Sierras Pampeanas at this latitude. Neotectonic evidence reveals that both systems are active, although the western sector has been active since at least middle to late Miocene times and recorded...

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