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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Temporal and spatial variations of CO_2 diffuse volcanic degassing on Cuicocha Caldera Lake- Ecuador
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Temporal and spatial variations of CO_2 diffuse volcanic degassing on Cuicocha Caldera Lake- Ecuador

机译：Cu_2弥漫性火山脱气在Cuicocha Caldera Lake-厄瓜多尔的时间和空间变化

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Cuicocha Caldera is the youngest eruptive center of Cotacachi-Cuicocha Volcanic Complex, located at the north of Ecuador. The caldera contains a lake of 3.95 km(2) surface, and a maximum depth of 148 m. Cuicocha Lake is characterized by the presence of CO2 gaseous diffuse emissions, perceptible as bubbling zones. Since 2011, CO2 diffuse flux measurements have been performed in this lake using the accumulation chamber method. The data obtained from twenty surveys were processed by means of the Graphical Statistical Approach and the Sequential Gaussian Simulation. The results reveal that Cuicocha lake has released a total estimated amount of similar to 400 kt of CO2 in the period between March 2011 and May 2019, with an average rate of 135 t/day. Furthermore, the spatial and temporal analysis of the data made possible the understanding of the processes occurring in the lake: 1) Lake stratification caused by the seasons seem to favor CO2 accumulation in the hipolimnion and its posterior releasing. Minimum total flux values of similar to 50 t/day have been estimated during "warm" stratified periods and maximum flux values of similar to 170 t/day have been recorded during "cold" overturn periods. Additionally, at least two anomalous degassing episodes were identified in 2012-2013, seemingly associated to changes in the volcanic activity also detected through seismicity. 2) Cuicocha CO2 degassing seems to be controlled by the existence of diffuse degassing structures at the lake bottom, which correspond to high permeability zones resulting from the intersection between similar to NE-SW and similar to WNW-ESE oriented structures. We propose a conceptual model to explain the systematic apparition of CO2 anomalies on specific areas of the lake surface. (C) 2020 Published by Elsevier B.V.
机译：Cuicocha Caldera是位于厄瓜多尔北部的Cotacachi-Cuicocha火山复合体最小的爆发中心。火山口含有3.95公里（2）米的湖，最大深度为148米。 Cuicocha湖的特征在于存在二氧化碳气态漫射排放，可观察到泡泡区。自2011年以来，使用累积室方法在该湖中进行了CO2漫射磁通量测量。通过图形统计方法和顺序高斯模拟来处理从20个调查获得的数据。结果表明，三月二十一至2019年5月，Cuicocha湖已发布总估计数量至400千克二氧化碳，平均率为135吨。此外，数据的空间和时间分析使得可能了解湖中发生的过程：1）由季节引起的湖泊分层似乎有利于Hipolimnion中的CO2积累及其后释放。在“温暖”分层期间估计了与50t /天类似的最小总磁通值，并且在“冷”翻转期间，已经记录了与170吨/天类似的最大通量值。另外，在2012-2013中鉴定了至少两个异常的脱气集，似乎与通过地震性检测到的火山活性的变化相关。 2）Cuicocha CO 2脱气似乎通过在湖底处存在漫射脱气结构来控制，其对应于由与NE-SW类似的交叉点产生的高渗透区，并且类似于WNW-ESE的结构。我们提出了一种概念模型来解释CO2异常在湖面特定区域的系统幻影。 （c）2020由elsevier b.v发布。

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