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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Geophysical imaging of fluid circulation and its relation with the structural system of Cerritos Colorados geothermal field, La Primavera caldera (Mexico)
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Geophysical imaging of fluid circulation and its relation with the structural system of Cerritos Colorados geothermal field, La Primavera caldera (Mexico)

机译：流体循环的地球物理成像及其与Cerritos Colorados地热田La Primavera火山口（墨西哥）的结构系统的关系

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La Primavera volcanic caldera was formed 95 ky ago producing peralkaline volcanism. The intra-caldera faults are a consequence of the uplift as a result of the new magma accumulation. This accumulation below the caldera structure was responsible for the caldera floor uplift, post-caldera volcanism, and hydrothermal activity in the Cerritos Colorados geothermal field. Here, we present the results of geophysical investigations of shallow hydrothermal activity and its relation with the structural system in this geothermal field. We applied the self-potential method that combined with surface temperature measurements allowed to identify the main infiltration and ascending fluid zones in the area. Electrical resistivity tomography (ERT) was measured in two selected places. One ERT profile (1.2 km in length) was located in the P12 well area, and a 3D resistivity model was carried out on the Cerritos Colorados graben area. Combining these geophysical prospecting results with a detailed structural map, we identified the main degassing zones (i.e. fumaroles) that correspond to higher permeability areas located along normal and strike-slip faults described for the first time in this work. In addition, we recognized a large number of small convective zones at meter-scale with clear circulation paths (upflow and downflow) of hydrothermal fluids. Therefore, our data suggest that a strong structural control exists on the surface manifestations of the hydrothermal system limiting the lateral extension of fluids. This emphasizes the importance that old structural boundaries related to the intra-caldera tectonic structures have upon the way hydrothermal fluids move.(C) 2018 Elsevier B.V. All rights reserved.
机译：La Primavera火山破火山口形成于95年前，产生过碱性的火山活动。火山口内断层是新岩浆堆积导致隆起的结果。火山口结构下方的这种积聚是造成Cerritos Colorados地热田中火山口底板隆升，火山口后火山活动和热液活动的原因。在这里，我们介绍了浅层热液活动的地球物理研究结果及其与该地热田构造体系的关系。我们将自势方法与表面温度测量相结合，从而确定了该地区的主要渗透和上升流体带。在两个选定的位置测量了电阻率层析成像（ERT）。一个ERT剖面（长度为1.2公里）位于P12井区，并在Cerritos Colorados抓取区进行了3D电阻率模型。将这些地球物理勘探结果与详细的结构图相结合，我们确定了主要的除气区（即喷气孔），它们对应于本文首次描述的沿正断层和走滑断层定位的较高渗透率区域。此外，我们认识到许多米级的小对流区，水热流体的循环路径清晰（上流和下流）。因此，我们的数据表明，在热液系统的表面表现形式上存在强大的结构控制，从而限制了流体的横向扩展。这强调了与火山口内部构造结构相关的旧结构边界对热液流动的重要性。（C）2018 Elsevier B.V.保留所有权利。

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