Publication Date:
2020-11-11
Description:
This paper reports a detailed geochemical study of thermal occurrences as observed in the edifice
and on the flanks of Mendeleev Volcano, Kunashir Island in August and September 2015. We showed that
three main types of thermal water are discharged there (neutral chloride sodium, acid chloride sulfate, and
acid sulfate types); these waters exhibit a zonality that is typical of volcano-hydrothermal island arc systems.
Spontaneous and solfataric gases have relatively low 3Не/4Не ratios, ranging between 5.4Ra and 5.6Ra, and
δ13С-СО2 between –4.8‰ and –3.1‰, and contain a light isotope of carbon in methane (δ13С ≈ –40‰).
Gas and isotope geothermometers yield relatively low temperatures around 200оС. The isotope compositions
in all types of water are similar to that of local meteoric water. The distribution of microcomponents varies
among different types. The isotope composition of dissolved Sr varies considerably, from 0.7034 as observed
in Kunashir rocks on an average to 0.7052 in coastal springs, which may have resulted from admixtures of seawater.
The total hydrothermal transport rates of magmatic Сl and SO4, as observed for Mendeleev Volcano,
are 7.8 t/d and 11.6 t/d, respectively. The natural outward transport of heat by the volcano’s hydrothermal system
is estimated as 21 MW.
Description:
Published
Description:
335–352
Description:
3V. Proprietà dei magmi e dei prodotti vulcanici
Description:
JCR Journal
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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