The sub-Andean thrust belt of the Tarija Basin in South America is undergoing an exploration boom due to interest in the emerging deep, fractured, Devonian gas play. Trap types involve hanging wall anticlines, which formed due to continued thrusting.

The structures were formed by a “rigid beam” type response to compression, with a major thrust fault detachment in the deep Kirusillas shale. A second roof detachment/thrust fault system is often responsible for additional, vertical deformation of younger strata, and for west-to-east displacement with respect to deep Devonian traps. The interplay between these two detachments makes it difficult to predict the...

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