Low Angle Contact Between the Oaxaca and Juárez Terranes Deduced From Magnetotelluric Data

  • Jorge A. Arzate-FloresEmail author
  • Roberto Molina-Garza
  • Fernando Corbo-Camargo
  • Víctor Márquez-Ramírez
Part of the Pageoph Topical Volumes book series (PTV)


We present the electrical resistivity model along a profile perpendicular to the Middle America trench in southern Mexico that reveals previously unrecognized tectonic features at upper to mid-crustal depths. Our results support the hypotheses that the upper crust of the Oaxaca terrane is a residual ~20 km thick crust composed by an ~10 km thick faulted crustal upper layer and an ~10 km thick hydrated and/or mineralized layer. Oaxaca basement overthrust the younger Juárez (or Cuicateco) terrane. The electrical resistivity model supports the interpretation of a slab subducting at a low angle below Oaxaca. Uplift in the Oaxaca region appears to be related to fault reactivation induced by low angle subduction. In the Juárez terrane, isostatic forces may contribute to uplift because it is largely uncompensated. In the Sierra Madre del Sur, closer to the coast, uplift is facilitated by slab-dehydration driven buoyancy. Both gravity and resistivity models are consistent with a thinned upper crust in the northeast end of the profile.


Magnetotellurics Subduction Oaxaca terrane Juarez terrane Uplift 


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Copyright information

© Springer International Publishing 2016

Authors and Affiliations

  • Jorge A. Arzate-Flores
    • 1
    Email author
  • Roberto Molina-Garza
    • 1
  • Fernando Corbo-Camargo
    • 1
  • Víctor Márquez-Ramírez
    • 1
  1. 1.Centro de GeocienciasUniversidad Nacional Autónoma de MéxicoJuriquillaMexico

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