Abstract

The edifices of many active volcanoes on the Kuril Islands contain hydrothermal systems whose surface manifestations include springs with diversity in their chemical compositions and in their physical and chemical parameters. Thermal waters of Kuril Islands were found to exhibit four main isotopic shifts relative to the local meteoric water line. The ultra-acid Cl–SO₄ (SO₄–Cl) waters show a mixing trend between the meteoric component and volcanic steam. Acid steam-heated SO₄ waters demonstrate trends indicating kinetic fractionation at temperatures near the boiling point. The isotope compositions for coastal springs plot at the line of mixing between meteoric and sea water. The oxygen isotope shift for the thermal waters that from geothermal wells is formed by isotope exchange with the host rock. The latitude effect detected in the isotope composition of meteoric water is also seen to varying degrees in the isotope composition of thermal water.

中文翻译：

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千岛群岛弧的热水中同位素组成（δD和δ18 O）的控制过程

摘要

千岛群岛上许多活火山的建筑物都包含热液系统，这些热液系统的表面表现为泉水，其化学成分和理化参数各不相同。发现千岛群岛的热水相对于当地的水位线有四个主要的同位素位移。Cl-SO ₄（SO ₄ -Cl）超酸性水在流星成分和火山蒸汽之间呈混合趋势。酸性蒸汽加热的SO ₄水显示出趋势，表明在接近沸点的温度下有动力学分馏。沿海泉水的同位素组成标绘在流星与海水的混合线上。来自地热井的热水中的氧同位素位移是通过与基质岩石进行同位素交换而形成的。在热水的同位素组成中还可以看到在陨石水的同位素组成中检测到的纬度效应在不同程度上。