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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Resistivity structure and geochemistry of the Jigokudani Valley hydrothermal system, Mt. Tateyama, Japan
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Resistivity structure and geochemistry of the Jigokudani Valley hydrothermal system, Mt. Tateyama, Japan

机译：地狱谷谷热液系统的电阻率结构和地球化学。日本立山市

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This study clarifies the hydrothermal system of Jigokudani Valley near Mt. Tateyama volcano in Japan by using a combination of audio-frequency magnetotelluric (AMT) survey and hot-spring water analysis in order to assess the potential of future phreatic eruptions in the area. Repeated phreatic eruptions in the area about 40,000 years ago produced the current valley morphology, which is now an active solfatara field dotted with hot springs and fumaroles indicative of a well-developed hydrothermal system. The three-dimensional (3D) resistivity structure of the hydrothermal system was modeled by using the results of an AMT survey conducted at 25 locations across the valley in 2013-2014. The model suggests the presence of a near-surface highly conductive layer of <50 m in thickness across the entire valley, which is interpreted as a cap rock layer. Immediately below the cap rock is a relatively resistive body interpreted as a gas reservoir. Field measurements of temperature, pH, and electrical conductivity (EC) were taken at various hot springs across the valley, and 12 samples of hot-spring waters were analyzed for major ion chemistry and H2O isotopic ratios. All hot-spring waters had low pH and could be categorized into three types on the basis of the Cl-/SO42- concentration ratio, with all falling largely on a mixing line between magmatic fluids and local meteoric water (LMW). The geochemical analysis suggests that the hydrothermal system includes a two-phase zone of vapor-liquid. A comparison of the resistivity structure and the geochemically inferred structure suggests that a hydrothermal reservoir is present at a depth of approximately 500 m, from which hot-spring water differentiates into the three observed types. The two-phase zone appears to be located immediately beneath the cap rock structure. These findings suggest that the hydrothermal system of Jigokudani Valley exhibits a number of factors that could trigger a future phreatic eruption. (C) 2016 Elsevier B.V. All rights reserved.
机译：这项研究澄清了山附近的地狱谷的热液系统。日本的立山火山结合了音频大地电磁（AMT）勘测和温泉水分析，以评估该地区未来潜水爆发的可能性。大约40,000年前该地区反复的潜水喷发产生了当前的山谷形态，现在是活跃的solfatara田地，点缀着温泉和喷气孔，这表明水热系统十分发达。使用2013-2014年在整个山谷的25个地点进行的AMT调查结果，对水热系统的三维（3D）电阻率结构进行了建模。该模型表明在整个山谷中存在厚度小于50 m的近表面高导电层，这被解释为盖层。紧邻盖岩下方的是一个相对电阻体，被解释为储气层。在整个山谷的各个温泉中进行了温度，pH和电导率（EC）的现场测量，并分析了12个温泉水样品的主要离子化学性质和H2O同位素比。所有温泉水的pH值低，可以根据Cl- / SO42-的浓度比分为三种类型，全部都落在岩浆流体和局部陨石水（LMW）之间的混合线上。地球化学分析表明，热液系统包括汽液两相区。电阻率结构和地球化学推断的结构的比较表明，在约500 m的深度处存在一个热液储层，温泉水可从中区分出三种观测类型。两相区似乎位于盖岩结构的正下方。这些发现表明，地狱谷地区的热液系统表现出许多因素，可能会引发未来的潜水爆发。 （C）2016 Elsevier B.V.保留所有权利。

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