The long-term variations of rare earth element contents in Tamagawa hot spring waters, Akita Prefecture, Japan.
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概要
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Rare earth element (REE) contents in Obuki spring waters from the Tamagawa geothermal system, Akita Prefecture, Japan, have been determined by ICP-MS to investigate their long-term variations over a thirty-year period. The contents of REE in hot spring waters were at ppb levels, showing zigzag patterns that obeyed Oddo-Harkins law. The REE pattern in those waters resembled that of andesite rock, which was collected near Obuki spring. The REE contents in hot spring waters during 30 years have been synchronous with those of sulfate ion. The light rare earth element (LREE) contents tend to increase with raising sulfate ion concentrations. This indicate that most of the REE in Obuki spring waters has been derived from water-rock interaction in acid under certain conditions, especially the predominance of sulfate ion and leaching rates of LREE from the rock that exceed those of the heavy rare earth elements. The behavior of REE in acid under such conditions was also confirmed by dissolution experiments conducted on andesite rock in sulfuric acid, hydrochloric acid, and a combination of both.
- 日本陸水学会の論文
日本陸水学会 | 論文
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