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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Natural Tracers For Identifying The Origin Of The Thermal Fluids Emerging Along The Aegean Volcanic Arc (greece): Evidence Of Arc-type Magmatic Water (atmw) Participation
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Natural Tracers For Identifying The Origin Of The Thermal Fluids Emerging Along The Aegean Volcanic Arc (greece): Evidence Of Arc-type Magmatic Water (atmw) Participation

机译：用于识别爱琴海火山弧（希腊）中涌出的热流体起源的自然示踪剂：弧型岩浆水（atmw）参与的证据

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The Aegean volcanic arc is the result of a lithosphere subduction process during the Quaternary time. Starting from the Soussaki area, from west to east, the arc proceeds through the islands of Egina, Methana, Milos, Santorini, the Columbus Bank, Kos and Nisyros. Volcano-tectonic activities are still pronounced at Santorini and Nisyros in form of seismic activity, craters of hydrothermal explosions, hot fumaroles and thermal springs. A significant number of cold water springs emerge in the vicinity of hot waters on these islands. Chemical and isotopic analyses were applied on water and fumaroles samples collected in different areas of the volcanic arc in order to attempt the assessment of these fluids. Stable isotopes of water and carbon have been used to evaluate the origin of cold and thermal water and CO_2. Chemical solute concentrations and isotopic contents of waters show that the fluids emerging in Egina, Soussaki, Methana and Kos areas represent geothermal systems in their waning stage, while the fluids from Milos, Santorini and Nisyros proceed from active geothermal systems. The δ~2H-δ~(18)O-Cl~- relationships suggest that the parent hydrothermal liquids of Nisyros and Milos are produced through mixing of seawater and Arc-Type Magmatic Water (ATMW), with negligible to nil contribution of local ground waters and with very high participation of the magmatic component, which is close to 70% in both sites. A very high magmatic contribution to the deep geothermal system could occur at Santorini as well, perhaps with a percentage similar to Nisyros and Milos, but it cannot be calculated because of steam condensation heavily affecting the fumarolic fluids of Nea Kameni before the surface discharge. The parent hydrothermal liquid at Methana originates through mixing of local groundwaters, seawater and ATMW, with a magmatic participation close to 19%. All in all, the contribution of ATMW is higher in the central-eastern part of the Aegean volcanic arc than in the western sector. This difference, which is spotted in the variable isotopic composition of the sampled fluids from west to east along the arc, is probably due to several causes, including the tectonic regime, the depth of the deep reservoir below sea level, the age of volcanic activity and in general the geomorphologic state of each island.
机译：爱琴海火山弧是第四纪岩石圈俯冲过程的结果。从Soussaki地区开始，从西向东，弧线穿过Egina，Methana，Milos，Santorini，哥伦布银行，Kos和Nisyros群岛。在圣托里尼岛和尼西罗斯岛，火山构造活动仍以地震活动，热液爆炸的火山口，热的喷气孔和温泉形成。在这些岛上的热水附近，涌现出大量冷水泉。为了对这些流体进行评估，对在火山弧不同区域收集的水和喷气孔样本进行了化学和同位素分析。水和碳的稳定同位素已用于评估冷热水和CO_2的来源。水中的化学溶质浓度和同位素含量表明，在Egina，Soussaki，Methana和Kos地区出现的流体代表了处于消退阶段的地热系统，而来自Milos，Santorini和Nisyros的流体则来自活跃的地热系统。 δ〜2H-δ〜（18）O-Cl〜-关系表明，尼西罗斯岛和米洛斯岛的母体热液是通过将海水和弧型岩浆水（ATMW）混合而产生的，而对当地地面的零贡献可忽略不计水域，并且岩浆成分的参与度很高，两个地点的岩浆成分均接近70％。圣托里尼也可能对深层地热系统产生非常高的岩浆贡献，其百分比可能与尼西罗斯岛和米洛斯岛相似，但是由于蒸汽凝结严重影响了地表排放前Nea Kameni的富马酸流体，因此无法计算。 Methana的母体热液来自于当地地下水，海水和ATMW的混合，岩浆参与度接近19％。总而言之，爱琴海火山弧的中东部地区对ATMW的贡献要高于西方地区。这种差异出现在沿弧线从西到东的采样流体的同位素组成变化中，可能是由于多种原因造成的，包括构造机制，海平面以下深层储层的深度，火山活动的年龄以及每个岛屿的地貌状态。

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