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首页> 外文期刊>Geochemical Journal >Calcium-sulfate rich water in landslide area of Tateyama Caldera, northern central Japan
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Calcium-sulfate rich water in landslide area of Tateyama Caldera, northern central Japan

机译：日本中部北部立山破火山口滑坡区富含硫酸钙的水

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摘要

Chemistry of surface waters from the Tateyama caldera known as a site of frequent landslides in northern central Japan was investigated to obtain the relationship between their geochemical characteristics and the landslide density in the watershed. Most waters in the caldera have water chemistry of a Ca-SO_4 type with high total ionic concentrations. Stream waters originating from the landslide areas have notably high sulfate concentration. Dissolution of rock-forming minerals such as plagioclase by sulfuric acid produced by oxidation of hydrothermal pyrite that was formed during alteration of volcanic rocks is responsible for the high calcium and sulfate concentration. The δ~(34)S values of dissolved sulfate in the surface waters support this view. Intense rock weathering at the head areas of sulfate-rich streams is likely to have caused the 1964 large-scale landslide there. Positive correlation between SO_4~(2-) concentration in the streams and a ratio of landslide area to the catchment area indicates a high probability of landslide in the area where SO_4~(2-) concentration in water is high. Hydrogeochemical information at landslide areas has a potential of identifying the area of future landslide.
机译：研究了位于日本中部北部频繁发生滑坡的立山破火山口的地表水化学，以获取其地球化学特征与流域滑坡密度之间的关系。破火山口中的大多数水都具有高总离子浓度的Ca-SO_4型水化学。来自滑坡地区的溪流水的硫酸盐浓度非常高。火山岩蚀变过程中形成的热液黄铁矿氧化产生的硫酸溶解了斜长石等成岩矿物，这是钙和硫酸盐含量高的原因。地表水中溶解的硫酸盐的δ〜（34）S值支持这一观点。富含硫酸盐的河流上游地区强烈的岩石风化可能导致1964年的大规模滑坡。河流中SO_4〜（2-）浓度与滑坡面积与集水区之比之间呈正相关关系，表明水中SO_4〜（2-）浓度高的地区发生滑坡的可能性很高。滑坡地区的水文地球化学信息有可能确定未来的滑坡地区。

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