Arima hot spring waters as a deep-seated brine from subducting slab
Arima hot spring waters as a deep-seated brine from subducting slab
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DOI：
10.1186/1880-5981-66-119
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发表时间：
2014-09-19
影响因子：
3
通讯作者：
Morikawa, Noritoshi
中科院分区：
文献类型：
--
作者：
Kusuda, Chiho;Iwamori, Hikaru;Morikawa, Noritoshi
人们普遍认为非火山温泉源自大气层或埋藏海水在深处加热的循环。在这项研究中，我们报告了日本西南部弧前地区有马和宝冢温泉水（称为有马型深层盐水）的地球化学特征。我们检测了14个水样，测定了12种溶质元素或成分的含量以及H、He、C、O和Sr的同位素比，并对数据进行相关分析，以推断深部卤水的来源和来源。此外，我们对沿俯冲板片的氧和氢同位素分馏进行了数值模拟，以检查板片衍生流体的成分作为深部盐水的可能候选者。结果表明，高盐度和溶质浓度以及特征性氧、氢、碳和锶同位素组成以及高 He-3/He-4 比率可以通过俯冲菲律宾海板片的脱水成分来解释。因此，这项研究可以提供对大深度范围内的地质流体过程的宝贵理解。
Non-volcanic hot springs are generally believed to originate through circulation of meteoric or buried sea water heated at depth. In this study, we report the geochemical characteristics of the Arima and Takarazuka hot spring waters, known as Arima-type deep brine, in a forearc region of southwestern Japan. We examine 14 water samples to determine the levels of 12 solute elements or components and the isotopic ratios of H, He, C, O, and Sr, and we perform correlation analysis of the data to deduce the source materials and origin of the deep brine. Moreover, we perform numerical modeling of oxygen and hydrogen isotopic fractionation along subducting slabs to examine the composition of slab-derived fluid as a possible candidate of the deep brine. The results suggest that the high salinity and solute concentrations with characteristic oxygen, hydrogen, carbon, and strontium isotope compositions, as well as high He-3/He-4 ratios, can be explained by a dehydrated component of the subducted Philippine Sea slab. Hence, this study may provide an invaluable understanding of geofluid processes over a significant depth range.