Chaplygin Ilya, Yudovskaya Marina, Vergasova Lidiya, Mokhov Andrey (2015) Native gold from volcanic gases at Tolbachik 1975–76 and 2012–13 Fissure Eruptions, Kamchatka // Journal of Volcanology and Geothermal Research. Vol. 307, pp. 200 - 209. doi: 10.1016/j.jvolgeores.2015.08.018.
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Официальный URL: http://www.sciencedirect.com/science/article/pii/S...
Аннотация
Abstract Aggregates and euhedral crystals of native gold were found in sublimates formed during New Tolbachik Fissure Eruption in 2012–2013 (NTFE). Gold-bearing sublimate samples were taken from a red-hot (690 °C) degassing fracture in the roof of an active lava tunnel 1.5 km from active Naboko cinder cone in May 2013. The gas condensate collected at 690 °C in this site contains 16 ppb Au, 190 ppb Ag and 1180 ppm Cu compared to 3 ppb Au, 39 ppb Ag and 9.7 ppm Cu in the condensate of pristine magmatic gas sampled at 1030 °C. The 690 °C volcanic gas is most likely a mix of magmatic gas and local snow buried under the lava flows as indicated by oxygen and hydrogen isotope compositions of the condensate. The lower-temperature gas enrichment in gold, copper and chlorine is resulted from evaporation of the 690 °C condensate during forced gas pumping at sampling. Native gold was also found in fumarolic encrustations collected from caverns in basalt lava flows with temperature up to 600 °C in June 2014, in a year after eruption finished. The native gold precipitation in newly formed Cu-rich sublimates together with the well known gold occurrences in cinder cones of 1975–1976 Large Tolbachik Fissure Eruption manifest a transport capability of oxidized volcanic gas.
Тип объекта: | Статья |
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Название: | Native gold from volcanic gases at Tolbachik 1975–76 and 2012–13 Fissure Eruptions, Kamchatka |
Язык: | English |
Издание: | Journal of Volcanology and Geothermal Research |
ISSN Print: | 0377-0273 |
Ключевые слова: | 2012–13 Tolbachik eruption, Native gold, Fumarole, Volcanic gas, 1975–76 Tolbachik Eruption |
Тематика: | 3 ГРНТИ - Государственный рубрикатор научно-технической информации > 38 ГЕОЛОГИЯ > 38.37 Петрография > 38.37.25 Вулканология 1 Вулканы > 1.1 Вулканы Курило-Камчатского региона > 1.1.1 Камчатка > Плоский Толбачик |
Дополнительная информация: | SI: 2012-13 Tolbachik eruption |
Разместивший пользователь: | И.М. Романова |
Дата размещения: | 15 Дек 2015 02:19 |
Последнее изменение: | 15 Дек 2015 02:19 |
URI: | http://repo.kscnet.ru/id/eprint/2534 |
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