首页> 外文期刊>Pure and Applied Geophysics >High CO2 Levels in Boreholes at El Teide Volcano Complex (Tenerife, Canary Islands): Implications for Volcanic Activity Monitoring
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High CO2 Levels in Boreholes at El Teide Volcano Complex (Tenerife, Canary Islands): Implications for Volcanic Activity Monitoring

机译:El Teide火山群(加那利群岛特内里费岛)钻孔中的CO2高水平:对火山活动监测的意义

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Emissions of CO2 have been known for more than a hundred years as fumarolic activity at the terminal crater of El Teide volcano and as diffuse emissions at numerous water prospection drillings in the volcanic island of Tenerife. Large concentrations of CO2 (>10% in volume) have been found inside galleries, long horizontal tunnels excavated for water mining. However, CO2 concentrations of only 2900 ppm have been observed at the surface of the central region of the island (Las Cañadas del Teide caldera). In this work we analysed CO2 concentrations in the subsurface of Las Cañadas caldera, in an attempt to study the vertical distribution of carbon dioxide and, in particular, the low emissions at the surface. This has been done through a series of 17 vertical profiles in two deep boreholes excavated in the Caldera. We found high levels of CO2, varying in time from 13 vol% up to 40 vol% in different profiles directly above the water table, while no significant concentrations were detected above the thermal inversion that takes places in both boreholes at approximately 100 m from the water table. Water analyses also showed high dissolved CO2 levels in equilibrium with the air, and an average δ13C value in DIC of +4.7‰ (PDB), apparently induced by fast CO2 degassing in the bicarbonated water.
机译:一百多年以来,二氧化碳的排放一直被认为是埃尔泰德火山末端火山口的富马酸活动,以及在特内里费岛的许多水勘探中的扩散排放。在长廊内开凿的水平隧道中,发现了高浓度的二氧化碳(> 10%体积),用于水开采。但是,在该岛中心区域(LasCañadasdel Teide火山口)的表面观察到的二氧化碳浓度仅为2900 ppm。在这项工作中,我们分析了LasCañadas破火山口地下的CO2浓度,以研究二氧化碳的垂直分布,尤其是地表的低排放量。这是通过在破火山口中开挖的两个深井中的一系列17个垂直剖面完成的。我们发现高水平的CO2 随时间变化,直接在地下水位上方的不同剖面中从13%(体积)到40%(体积)变化,而在大约两个井眼发生的热转化之上,没有发现明显的浓度。距地下水位100 m。水分析还显示出与空气平衡的高溶解CO2 水平,并且DIC中的平均δ13C值为+ 4.7‰(PDB),这显然是由碳酸氢盐水中的快速CO2 脱气引起的。

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