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首页> 外文会议>Geothermal Resources Council Annual Meeting Expo >Remote sensing and surface geology applied to geothermal exploration in the Kovire zone, Tacna, Peru
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Remote sensing and surface geology applied to geothermal exploration in the Kovire zone, Tacna, Peru

机译：遥感和表面地质应用于Kovire区的地热勘探，秘鲁

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The Kovire geothermal zone is located in southern Peru at an average altitude of 4300 m above sea level. It is characterized by the presence of hot springs at a maximum temperature of 86 °C (boiling at this elevation) with flow rates of up to 50 L/s and sinter deposits. The geological setting consists of a silicoclastic sedimentary basement of Mesozoic age, on which products of volcanic eruptions (mainly porphyritic andesite) have been deposited during discontinuous effusive and explosive episodes, and accompanied by sediments formed in a lagoon environment. Volcanic activity occurs during the Cenozoic, with age of 0.1 Ma, the most recent recorded with K/Ar dating. The structural configuration of the Kovire geothermal zone indicates that it is framed within a regional caldera structure, within which andesitic volcanics and dacitic domes have been emplaced. The main local faults are normal with a strike direction NW-SE and N-S: they are located within the caldera structure, are considered neotectonic faults and have a diffuse scarp. To generate maps of mineral assemblages associated with hydrothermal surface alterations, as well as the identification of anomalies in the surface temperature of the soil, ASTER satellite images were processed using supervised classification techniques. The classifications were validated with reflectance data collected in the field using the FieldSpec-4 spectroradiometer. The maps are useful to delineate the type and extent of geothermal activity at Kovire. The ASTER data show strong absorption in band 6 due to the presence of clay minerals such as kaolinite, alunite and dickite, minerals that are typical in an argillic alteration. Additionally, phyllic alteration is indicated via an absorption between band 5 and 6 due to the presence of muscovite, illite and montmorillonite. Propylitic alteration is also present, with strong absorption in band 8 due to the presence of chlorite, epidote and calcite.
机译：Kovire地热区位于秘鲁南部，平均海拔4300米。其特征在于，在最高温度为86℃（在该升高）的最高温度下存在热弹簧，其流速高达50磅/秒和烧结沉积物。地质环境由中生代时代的二氧化硅沉积地下室组成，在不连续的波动和爆炸性发作期间已经沉积了火山喷发（主要是卟啉骨灰）的产品，并伴有在泻湖环境中形成的沉积物。在新生代期间发生火山的活动，年龄为0.1 mA，最近录制的K / AR约会。 Kovire地热区的结构构造表明它在区域卡尔德岛结构中陷害，其中依旧火山岩和成功圆顶已被送建。主体局部故障正常，具有击球方向NW-SE和N-S：它们位于卡尔德尔达结构内，被认为是射精故障并具有漫射围巾。为了产生与水热表面改变相关的矿物组合的地图，以及在土壤的表面温度下鉴定异常，使用受监督分类技术处理紫色卫星图像。使用FieldSpec-4 SpectroriDiomometer验证了该字段中收集的反射数据的分类。地图可用于描绘Kovire的地热活动的类型和程度。由于存在粘土矿物，如高岭石，单位和岩石，典型的岩石改变，抗粘土矿物质，紫砂数据显示出强烈吸收。另外，由于葡萄奶盐，伊尔石和蒙脱石的存在，通过带5和6之间的吸收表明文学改变。由于亚氯酸盐，食虫和方解石的存在，也存在丙基改变，具有强烈吸收带8。

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