Reactive processes during the discharge of high temperature volcanic gases

Volcanic gases transport trace metals in concentrations ranging from 1 ppb to 50 ppm. Cooling of these gases during their ascension to the surface is at the origin of exceptional mineralizations such as rhenium sulfide deposits at Kudryavy volcano. Direct interactions between gases and rocks produce secondary mineralogical assemblages, at high temperatures (600 to 900°C), which are characterized by the occurrence of a garnet, at Kudryavy. We also study the behavior of the metals emitted by passively degassing volcanoes over long term periods (30 to 800 years), and the impact of these emissions in the atmosphere.   

CV

Thesis:

Reactive processes during the discharge of high temperature volcanic gases, 2004.

Abstract (pdf)

Introduction (pdf)

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Bibliography (pdf format):

F. Africano1, G. Van Rompaey1, A. Bernard1, and F. Le Guern, 2002. Deposition of trace elements from high temperature gases of Satsuma-Iwojima volcano. Earth Planets Space, 54, 275-286. (pdf)

F. Africano, A. Bernard, 2000. Acid alteration in the fumarolic environment of Usu volcano, Hokkaido, Japan. Journal of Volcanology and Geothermal Research 97, 475–495. (pdf)

Yuri A. Tarana, Alain Bernard, Juan-Carlos Gavilanesc, Fatima Africano, 2000. Native gold in mineral precipitates from high-temperature volcanic gases of Colima volcano, Mexico. Applied Geochemistry 15, 337-346 (pdf)