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首页> 外文期刊>Bulletin of Volcanology: Journal of the International Association of Volcanology and Chemistry of the Earth s Interior >Brownish discoloration of the summit crater lake of Mt. Shinmoe-dake, Kirishima Volcano, Japan: volcanic–microbial coupled origin
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Brownish discoloration of the summit crater lake of Mt. Shinmoe-dake, Kirishima Volcano, Japan: volcanic–microbial coupled origin

机译：山顶火山口湖的褐色变色。日本雾岛火山Shinmoe-dake：火山微生物耦合起源

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摘要

A drastic change in lake water color from bluegreen to brown was observed in the summit crater lake of Mt. Shinmoe-dake, Kirishima Volcano about 8 months after its 2008 eruption. The color change lasted for about 2 months (April–June 2009). The discoloration was attributed to a brownish color suspension that had formed in the lake water. X-ray fluorescence and Fourier transform infrared analyses of a sample of the suspension identified schwertmannite (Fe_8O)8(OH)_6(SO_4)). A cultivation test of iron-oxidizing bacteria for the sampled lake water with lakebed sediment revealed that the crater lake hosts iron-oxidizing bacteria, which likely participated in schwertmannite formation. We suggest that pyrite (FeS_2) provided an energy source for the ironoxidizing bacteria since the mineral was identified in hydrothermally altered tephra ejected by the August 2008 eruption. From consideration of these and other factors, the brownish discoloration of the summit crater lake of Mt. Shinmoe-dake was inferred to have resulted from a combined volcanic– microbial process.
机译：在山的火山口湖中观察到了湖泊的水色从蓝绿色急剧地变为棕色。雾岛火山新月岳2008年喷发约8个月后。颜色变化持续了大约2个月（2009年4月至6月）。变色归因于在湖水中形成的褐色悬浮液。悬浮液样品的X射线荧光和傅里叶变换红外分析确定了schwertmannite（Fe_8O）8（OH）_6（SO_4））。对带有湖床沉积物的采样湖水中的铁氧化细菌进行的培养试验表明，火山口湖中含有铁氧化细菌，可能参与了schwertmannite的形成。我们建议，黄铁矿（FeS_2）为铁氧化细菌提供了能源，因为该矿物是在2008年8月喷发而喷出的水热改变的提夫拉中发现的。考虑到这些因素和其他因素，山顶火山口湖呈褐色。推测Shinmoe-dake是由火山－微生物过程共同作用造成的。

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