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首页> 外文期刊>Pure and Applied Geophysics >Low Angle Contact Between the Oaxaca and Juarez Terranes Deduced From Magnetotelluric Data
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Low Angle Contact Between the Oaxaca and Juarez Terranes Deduced From Magnetotelluric Data

机译：大地电磁数据推导的瓦哈卡与华雷斯地形之间的低角度接触

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摘要

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 similar to 20 km thick crust composed by an similar to 10 km thick faulted crustal upper layer and an similar to 10 km thick hydrated and/or mineralized layer. Oaxaca basement overthrust the younger Juarez (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 Juarez 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.
机译：我们沿垂直于墨西哥南部中美洲海沟的剖面呈现了电阻率模型，该模型揭示了上至中地壳深度以前无法识别的构造特征。我们的结果支持这样的假设：瓦哈卡地层的上地壳是类似于20 km厚的地壳的残余物，它由类似于10 km厚的断层地壳上层和类似于10 km的水合和/或矿化层组成。瓦哈卡地下室推翻了年轻的华雷斯（或Cuicateco）地层。电阻率模型支持对瓦哈卡州以下低角度俯冲板坯的解释。瓦哈卡州地区的隆升似乎与低角度俯冲引起的断层复活有关。在Juarez地形中，等静力可能会导致升力，因为它基本上没有补偿。在靠近海岸的Sierra Madre del Sur，平板脱水驱动的浮力促进了隆升。重力和电阻率模型都与剖面东北端的上地壳变薄一致。

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