To analyze the process of subduction of the Nazca and South American plates in the area of the Southern Andes, and its relationship with the tectonic and volcanic regime of the place, magnetotelluric measurements were made through a transversal profile of the Chilean continental margin. The data-processing stage included the analysis of dimensional parameters, which as first results showed a three-dimensional environment for periods less than 1 s and two-dimensional for periods greater than 10 s. In addition, through the geomagnetic transfer function (tipper), the presence of structural electrical anisotropy was identified in the data. After the dimensional analysis, a deep electrical resistivity image was obtained by inverting a 2D and a 3D model. Surface conductive anomalies were obtained beneath the central depression related to the early dehydration of the slab and the serpentinization process of the mantle that coincides in location with a discontinuity in the electrical resistivity of a regional body that we identified as the Nazca plate. A shallow conductive body was located around the Calbuco volcano and was correlated with a magmatic chamber or reservoir which in turn appears to be connected to the Liquiñe Ofqui fault system and the Andean Transverse Fault system. In addition to the serpentinization process, when the oceanic crust reaches a depth of 80–100 km, the ascending fluids produced by the dehydration and phase changes of the minerals present in the oceanic plate produce basaltic melts in the wedge of the subcontinental mantle that give rise to an eclogitization process and this explains a large conductivity anomaly present beneath the main mountain range.

中文翻译：

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在洛斯拉各斯地区（智利）进行大地电磁研究，以调查安第斯山脉南部的火山构造过程

为了分析南安第斯山脉地区纳斯卡和南美板块的俯冲过程及其与该地区构造和火山制度的关系，通过智利大陆边缘的横向剖面进行了大地电磁测量。数据处理阶段包括维度参数的分析，其初步结果显示周期小于 1 秒的三维环境和周期大于 10 秒的二维环境。此外，通过地磁传递函数（tipper），在数据中确定了结构电各向异性的存在。尺寸分析后，通过反转 2D 和 3D 模型获得深层电阻率图像。在与板块的早期脱水和地幔的蛇纹石化过程有关的中央凹陷下方获得了表面导电异常，该过程与我们确定为纳斯卡板块的区域体的电阻率不连续的位置重合。一个浅导电体位于 Calbuco 火山周围，与岩浆室或储层相关，后者似乎与 Liquiñe Ofqui 断层系统和安第斯横向断层系统相连。除了蛇纹石化过程，当大洋地壳深度达到 80-100 公里时，