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Native gold from volcanic gases at Tolbachik 1975–76 and 2012–13 Fissure Eruptions, Kamchatka

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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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Abstract

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.
Item Type: Article
Title: Native gold from volcanic gases at Tolbachik 1975–76 and 2012–13 Fissure Eruptions, Kamchatka
Language: English
Journal or Publication Title: Journal of Volcanology and Geothermal Research
ISSN Print: 0377-0273
Uncontrolled Keywords: 2012–13 Tolbachik eruption, Native gold, Fumarole, Volcanic gas, 1975–76 Tolbachik Eruption
Subjects: State scientific and technical information rubricator (ГРНТИ) > 38 ГЕОЛОГИЯ > 38.37 Петрография > 38.37.25 Вулканология
Volcanoes > 1 Volcanoes of the Kurile-Kamchatka Region > 1.1 Kamchatka > Plosky Tolbachik
Additional Information: SI: 2012-13 Tolbachik eruption
Depositing User: И.М. Романова
Date Deposited: 15 Dec 2015 02:19
Last Modified: 15 Dec 2015 02:19
URI: http://repo.kscnet.ru/id/eprint/2534

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