Institute of Volcanology and Seismology FEB RAS Repository
IVS FEB RAS
Поиск
Browse
IVS FEB RAS Items
Statistics
Instruction
Links

Geochemistry and solute fluxes of volcano-hydrothermal systems of Shiashkotan, Kuril Islands

Kalacheva Elena, Taran Yuri, Kotenko Tatiana (2015) Geochemistry and solute fluxes of volcano-hydrothermal systems of Shiashkotan, Kuril Islands // Journal of Volcanology and Geothermal Research. Vol. 296, pp. 40-54. doi: 10.1016/j.jvolgeores.2015.03.010.

[img]
Preview
Text
Shiashkotan, Kalacheva at all, 2015.pdf

Download (2MB) | Preview

Official URL: http://doi.org/10.1016/j.jvolgeores.2015.03.010

Abstract

Shiashkotan Island belongs to the Northern Kuril island arc and consists of two joined volcanoes, Sinarka and Kuntomintar, with about 18 km of distance between the summits. Both volcanoes are active, with historic eruptions, and both emit fumarolic gases. Sinarka volcano is degassing through the extrusive domewith inaccessible strong and hot (N400 °C) fumaroles. A large fumarolic field of the Kuntomintar volcano situated in a wide eroded caldera-like crater hosts many fumarolic vents with temperatures from boiling point to 480 °C. Both volcanoes are characterized by intense hydrothermal activity discharging acid SO4-Cl waters, which are drained to the Sea of Okhotsk by streams. At least 4 groups of near-neutral Na-Mg-Ca-Cl-SO4 springs with temperatures in the range of 50–80 °C are located at the sea level,within tide zones and discharge slightly altered diluted seawater. Volcanic gas of Kuntomintar as well as all types of hydrothermal manifestations of both volcanoes were collected and analyzed for major and trace elements and water isotopes. Volcanic gases are typical for arc volcanoes with 3He/4He corrected for air contamination up to 6.4 Ra (Ra=1.4 ×10−6, the air ratio) and δ13C (CO2) within −10‰to−8‰VPDB. Using a saturation indices approach it is shown that acid volcanic waters are formed at a shallow level, whereas waters of the coastal springs are partially equilibrated with rocks at ~180 °C. Trace element distribution and concentrations and the total REE depend on the water type, acidity and Al+Fe concentration. The REE pattern for acidic waters is unusual but similar to that found in some acidic crater lake waters. The total hydrothermal discharge of Cl and S from the island associated with volcanic activity is estimated at ca. 20 t/d and 40 t/d, respectively, based on the measurements of flow rates of the draining streams and their chemistry. The chemical erosion of the island by surface and thermal waters is estimated at 27 and 140 ton/km2/year, respectively, which is 2–3 times lower than chemical erosion of tropical volcanic islands.
Item Type: Article
Title: Geochemistry and solute fluxes of volcano-hydrothermal systems of Shiashkotan, Kuril Islands
Language: English
Journal or Publication Title: Journal of Volcanology and Geothermal Research
ISSN Print: 03770273
Subjects: State scientific and technical information rubricator (ГРНТИ) > 38 ГЕОЛОГИЯ > 38.33 Геохимия > 38.33.17 Геохимия природных процессов
Volcanoes > 1 Volcanoes of the Kurile-Kamchatka Region > 1.2 Kurile Islands > Kuntomintar
Volcanoes > 1 Volcanoes of the Kurile-Kamchatka Region > 1.2 Kurile Islands > Sinarka
Depositing User: к.г.-м.н. Елена Калачева
Date Deposited: 23 Dec 2016 00:23
Last Modified: 23 Dec 2016 00:23
URI: http://repo.kscnet.ru/id/eprint/2867

Actions (login required)

View Item View Item