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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Subaqueous geothermal activity revealed by lacustrine sediments of the acidic Nakadake crater lake, Aso Volcano, Japan
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Subaqueous geothermal activity revealed by lacustrine sediments of the acidic Nakadake crater lake, Aso Volcano, Japan

机译：日本麻生火山酸性Nakadake火山口湖的湖相沉积物揭示了水下地热活动

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摘要

Lacustrine sediments were sampled from the inaccessible acidic (pH = 0.43) Nakadake crater lake of Aso Volcano, Japan by a simple method. The sediments contain an extremely high content (74 wt.%) of sulfur, which exits as elemental sulfur, gypsum and anhydrite. The abundant elemental sulfur is likely formed by the reaction of SO_2 and H_2S gases and by the SO_2 disproportionation reaction in magmatic hydrothermal system below the crater lake. Based on the sulfur content of sediments and measurements of elevation change of the crater bottom, the sulfur accumulation rate at the Nakadake crater lake was calculated as 250 tonne/day, which is comparable with the SO_2 emission rate (200-600 tonne/day) from the Nakadake crater. The sediments include a small amount (9%) of clear glass shards that are apparently not altered in spite of the high reactivity of hyperacid lake water. This finding suggests that the clear glass shards are fragments of recently emitted magmas from fumaroles on the bottom of the crater lake and the magma emissions continuously occur even in quiescent periods.
机译：通过简单的方法，从日本阿苏火山中难以接近的酸性（pH = 0.43）Nakadake火山口湖中提取了Lacustrine沉积物。沉积物中的硫含量极高（74重量％），以元素硫，石膏和硬石膏的形式排出。火山口湖以下岩浆热液系统中SO_2和H_2S气体的反应以及SO_2歧化反应可能形成大量的元素硫。根据沉积物中的硫含量和火山口底部高度变化的测量结果，Nakadake火山口湖的硫累积速率计算为250吨/天，与SO_2排放速率（200-600吨/天）相当。来自Nakadake火山口。沉积物包括少量（9％）的透明玻璃碎片，尽管高酸度湖水具有高反应活性，但显然没有改变。这一发现表明，透明玻璃碎片是火山口湖底部的喷气孔最近发射的岩浆的碎片，即使在静止期，岩浆也连续不断地发生。

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