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首页> 外文期刊>Journal of Volcanology and Geothermal Research >The hydrothermal-volcanic system of Rincon de la Vieja volcano (Costa Rica): A combined (inorganic and organic) geochemical approach to understanding the origin of the fluid discharges and its possible application to volcanic surveillance
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The hydrothermal-volcanic system of Rincon de la Vieja volcano (Costa Rica): A combined (inorganic and organic) geochemical approach to understanding the origin of the fluid discharges and its possible application to volcanic surveillance

机译：Rincon de la Vieja火山（哥斯达黎加）的热液火山系统：结合（无机和有机）地球化学方法来了解流体排放的起源及其在火山监测中的可能应用

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摘要

In the period 1998-2002 thermal spring discharges of Rincon de la Vieja volcano (NW Costa Rica) have been sampled and analyzed for major, trace and isotopic (~(18)O/~(16)O and D/H in waters and ~3He/~4He and ~(13)C/~(12)C in CO_2 in gases) composition. The boiling pools hosted inside the summit crater (Active Crater) are characterized by high contents of magmatic-related compounds (SO_2, HCl and HF) that strongly affect the chemistry of the crater lake. These chemical features are not shown by the thermal discharges seeping out in the surrounding area of the volcano. Here, the shallow aquifer apparently masks any possible clues related to the magmatic system. This suggests that the fluid vents located inside the Active Crater are likely to represent the most appropriate sampling sites for geochemical surveillance purposes, although the high gas discharge rate from the lake may occasionally prevent any fluid sampling. Alternatively, as already suggested by recent studies on the behavior of light hydrocarbons in different volcanic environments, the compositional features of the organic gas fraction in the more accessible outer flank thermal discharges could usefully be utilized, at least, to assess the thermodynamic conditions of the volcanic-hydrothermal system, since these compounds are affected by secondary processes only at limited extent.
机译：在1998-2002年期间，对Rincon de la Vieja火山（西北哥斯达黎加）的温泉排放进行了采样，并分析了海水中主要，痕量和同位素（〜（18）O /〜（16）O和D / H）的含量。气体中的〜3He /〜4He和〜（13）C /〜（12）C在CO_2中的组成）。位于山顶火山口（活动火山口）内部的沸腾池的特征是与岩浆有关的化合物（SO_2，HCl和HF）含量高，这些化合物会严重影响火山口湖的化学性质。这些化学特征没有显示在火山周围区域的热流中。在这里，浅层含水层显然掩盖了与岩浆系统有关的任何可能线索。这表明位于活动火山口内的流体喷口很可能代表了最适合地球化学监测的采样地点，尽管从湖泊中排出的高气体速率有时可能会阻止任何流体采样。另外，正如最近有关不同火山环境中轻烃行为的研究所表明的那样，在较易接近的外侧燃烧中，有机气体馏分的组成特征至少可以用来评估其热力学条件。火山-水热系统，因为这些化合物仅在有限的程度上受到次级过程的影响。

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