Hydrogen and oxygen isotopic ratios and major element chemistry of Japanese thermal water systems
Hydrogen and oxygen isotopic ratios and major element chemistry of Japanese thermal water systems
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日本温泉水系统的氢氧同位素比和主要元素化学
DOI：
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发表时间：
1973
期刊：
影响因子：
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通讯作者：
H. Satake
中科院分区：
文献类型：
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作者：
O. Matsubaya;H. Sakai;I. Kusachi;H. Satake
对日本140多个热水沃茨进行了同位素和化学研究。大坂附近的有马和宝冢、兵库县和石拔的高盐卤水表明，δ 18 O和δD值范围很广，从大气降水的δ 18 O = -8.2和δD = -50.0 ‰ SMOW到分别为+6.5和-27.8 ‰的高度偏移值。这些盐水的同位素值与氯化物浓度成比例变化，而与温度、碳酸盐浓度或位置无关。这些盐水沃茨在同位素和化学上最好解释为当地大气沃茨和盐水的混合物，Cl-= 43，700 ppm，δ 18 O = +8 ‰，δD = -30至-25 ‰。后者最有可能是“残留的岩浆，变质或地热”流体与上白垩统流纹岩和花岗质岩石和Ryoke变质岩中发现这些盐水。热沃茨在池田和邻近地区，岛根县和Senami，新泻县，类似于有马盐水的同位素和主要元素化学，但更稀释各自的本地大气沃茨。沿着海洋海岸的许多热沃茨的同位素介于海洋和当地大气沃茨之间，被认为是两种水的混合物。由于热液矿物-海水相互作用的结果，沿海热沃茨的化学成分与淡水有很大的不同，是典型的Na-Ca-Cl型。沿海热沃茨的同位素和化学成分可能类似，如果不是相同的，海底热液成矿流体负责的黑子型矿化。然而，同位素值及其与盐度的关系因各系统的水文地质条件而异。日本鹿儿岛县阿塔火山口的指宿沿岸热沃茨受池田湖、宇内池和香见池三个火山口湖的沃茨的影响较大，其δ 18 O和δD值在气象上处于平衡状态，分别为-2.6和-19.4‰。酸性到中性的火山热沃茨表明不同程度的同位素变化，但从它们的δD值来看，它们基本上来自再循环的大气降水。许多热沃茨的中性氯化物类型的“绿色凝灰岩”地区的内部本州也是简单的流星的起源，没有显示出任何显着的同位素变化，虽然沃茨的盐度和SO 4/Cl比相对较高。
More than 140 thermal waters of Japan were studied isotopically and chemically. Highly saline brines at Arima and Takarazuka, Hyogo-Ken, and Ishibotoke near Osaka indicate wide ranges of δ18O and δD values from meteoric values of δ18O = -8.2 and δD = -50.0 ‰ SMOW to highly shifted values of +6.5 and -27.8 ‰, respectively. The isotopic values of these brines vary proportionally with chloride concentration irrespective of temperature, carbonate concentration or locality. These saline waters are isotopically and chemically best explained as the mixtures of local meteoric waters and a saline brine of Cl-= 43, 700 ppm, δ18O = +8 ‰ and δD = -30 to -25 ‰. The latter is most likely the “residual magmatic, metamorphic or geothermal” fluid associated with upper Cretaceous rhyolitic and granitic rocks and Ryoke metamorphic rocks in which these brines are found. Thermal waters at Ikeda and in adjacent areas, Shimane-Ken and at Senami, Niigata-Ken, are similar to the Arima brines in the isotopic and major element chemistry, but are much more diluted by the respective local meteoric waters. Many of the thermal waters along the ocean coasts are isotopically intermediate between oceanic and local meteoric waters and are considered to be mixtures of the two types of water. As a result of hydrothermal mineral-sea water interaction, the coastal thermal waters differ considerably in the chemistry from fresh sea water and are typical of Na-Ca-Cl type. The coastal thermal waters isotopically and chemically may be similar, if not the same, to submarine hydrothermal ore fluids responsible for the Kuroko type mineralization. The isotopic values and their relationship to salinity, however, widely differ from one system to another depending on the hydrogeological conditions of each system. The coastal thermal waters at Ibusuki of Ata Caldera, Kagoshima-Ken, for instance, are significantly affected by the waters from three crater lakes, Lake Ikeda, Unagi-Ike and Kagami-Ike, in which the δ18O and δD values are meteorologically balanced at such high values as -2.6 and -19.4‰, respectively. Acid to neutral thermal waters of volcanic affiliation indicate varying degrees of isotopic shifts, but they are supposed from their δD values to be essentially derived from recycled meteoric water. Many thermal waters of neutral chloride type in the “green tuff” regions of the inner Honshu also are simple meteoric in origin without showing any significant isotopic shifts, although the waters are relatively high in salinity and SO4/Cl ratios.