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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Structural assessment and geochemistry of thermal waters at the Cerro Machin Volcano (Colombia): An approach to understanding the geothermal system
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Structural assessment and geochemistry of thermal waters at the Cerro Machin Volcano (Colombia): An approach to understanding the geothermal system

机译：Cerro Machin火山（哥伦比亚）热水的结构评估和地球化学：一种了解地热系统的方法

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摘要

Through a detailed structural assessment of faults, carried out by remote sensing and a slip-dilation tendency analysis along with water geochemistry of thermal waters, it was possible to characterize the geothermal system of Cerro Machin Volcano (CMV) located in the western flank of the Cordillera Central of Colombia. The study shows that the geothermal system presents a favorable structural setting for the transport of fluids (e.g. fault intersection), where the structural component is marked by faults striking NW-SE, NE-SW, and N-S, controlling its deformational model, permeability and therefore, the fluid flow path. In addition, hydro-geochemistry allows identifying two sets of water (i) Na-HCO3 and (ii) Ca-HCO3 types. Na-HCO3 springs are representatives of a more direct upflow in the system, where fluid uses critically stressed areas to ascend. In contrast, Ca-HCO3 springs are more strongly affected by subsurface process such as mixing and water rock interaction. The geothermal system is characterized of a convection-dominated geothermal play associated with recent volcanism, which is recharged by meteoric waters that flow through fractures and faults and is strongly influenced by a CO2-rich fluid coming from deeper levels. The reservoir occupies a fracture zone within the Cajamarca complex with an estimated temperature of around 220 degrees C, according to solute and multicomponent geothermometry. (C) 2020 Elsevier B.V. All rights reserved.
机译：通过对故障进行详细的结构评估，通过遥感和防滑倾向分析以及水地球化学的水土化学进行，可以表征位于西部侧翼的Cerro Machin火山（CMV）的地热系统。 Cortillera哥伦比亚的中心。该研究表明，地热系统具有良好的结构设置，用于运输流体（例如故障交叉路口），其中结构部件由触发NW-SE，NE-SW和NS的故障标记，控制其变形模型，渗透率和因此，流体流动路径。此外，水力地球化学允许鉴定两组水（I）Na-HCO3和（II）Ca-HCO3类型。 Na-HCo3 Springs是系统中更直接的上流的代表，其中流体使用批判性强调区域来提升。相比之下，Ca-HCO3弹簧受到地下过程的影响，如混合和水岩相互作用。地热系统的特征在于与最近的火山相关的对流主导地热发挥，其被流过裂缝和故障的陨石水重新充电，并且受到来自深层水平的二氧化碳流体的强烈影响。根据溶质和多组分地热测定法，储存器占据Cajamarca复合物内的裂缝区，估计温度约为220℃。 （c）2020 Elsevier B.v.保留所有权利。

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