Storia termica di una fumarola del Vesuvio (Campania, Italy) attraverso lo studio di minerali presenti su di un microcampione

Alava scoria sample rich in crystals, from
a fumarole of the 1906 eruption, has been examined
in the present work. The analyses of the
sample were performed by an EDS-equipped
scanning electron microscope which made possible
to identify galena, sphalerite, challacolloite
and gypsum; these minerals can be considered
as temperature-markers. At first the fumarole
was in high temperature conditions (higher than
650°C and however not lower than 400-300°C)
with deposition of galena and sphalerite. When
temperature decreased a film of challacolloite
(KPb2Cl5) was formed and coated the existing
minerals. Finally, after a sudden drop in temperature
gypsum was formed.
These findings are in agreement with the
formation of galena and sphalerite into silica
tubes placed in fumaroles of others volcanoes,
according the methodology proposed by [Le
Guern e Bernard, 1982].

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