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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Methana, The Westernmost Active Volcanic System Of The South Aegean Arc (greece): Insight From Fluids Geochemistry
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Methana, The Westernmost Active Volcanic System Of The South Aegean Arc (greece): Insight From Fluids Geochemistry

机译：Methana，南爱琴海弧最西端的活火山系统（希腊）：流体地球化学的真知灼见

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摘要

An extensive geochemical survey of the fluids released by the volcanic/geothermal system of Methana was undertaken. Gases were characterized based on the chemical and isotopic [helium (He) and carbon (C)] analysis of 27 samples. Carbon dioxide soil gas concentration and fluxes were measured at 179 sampling sites throughout the peninsula. Forty samples of thermal and cold groundwaters were also sampled and analysed to characterize the geochemistry of the aquifers. Gases of hydrothermal origin gave a preliminary geothermometric estimate of about 210 ℃. The He-isotope composition indicated mantle contributions of up to 40%, and the C-isotope composition of CO_2 indicated that it predominantly (>90%) originated from limestone decomposition. The groundwater composition was suggestive of mixing between meteoric and hydrothermally modified sea-water endmembers and water-rock interaction processes limited to simple rock dissolution driven by an increased endogenous CO_2 content All of the thermal manifestations and anomalous degassing areas, although of limited extent, were spatially correlated with the main active tectonic system of the area. The total CO_2 output of the volcanic system has been preliminary estimated to be less than 0.05 kg s~(-1). Although this value is very low compared to those of other volcanic systems, anomalous CO_2 degassing at Methana - which is currently restricted to limited areas and at present is the only volcanic risk of the peninsula - is a potential gas hazard that warrants further assessment in future studies.
机译：对Methana的火山/地热系统释放的流体进行了广泛的地球化学调查。根据27个样品的化学和同位素[氦（He）和碳（C）]分析对气体进行了表征。在整个半岛的179个采样点测量了二氧化碳的土壤气体浓度和通量。还对40个热水和冷地下水样品进行了采样和分析，以表征含水层的地球化学特征。热液来源的气体对地热的初步估计约为210℃。 He同位素组成表明地幔贡献高达40％，CO_2的C同位素组成表明其主要（> 90％）源自石灰石分解。地下水的组成暗示了流变和热液改性的海水末端元之间的混合，水-岩相互作用过程仅限于简单的岩石溶解，这是由内源性CO_2含量增加驱动的。尽管程度有限，所有的热表现和异常脱气区域都是与该地区主要的活动构造系统在空间上相关。初步估计火山系统的总CO_2排放量小于0.05 kg s〜（-1）。尽管与其他火山系统相比，该值非常低，但Methana的异常CO_2脱气（目前仅限于有限的区域，目前是该半岛的唯一火山风险）是潜在的瓦斯危害，有必要在未来进行进一步评估学习。

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