ISOTOPIC AND CHEMICAL COMPOSITION OF WATERS OF THE YUZHNO-SAKHALINSK MUD VOLCANO (SAMPLING IN 2009 AND 2010)

• Main Authors: Nikitenko , Olga A., Ershov , Valery V.
• Format: Text
• Language: Russian
• Published: Southern Federal University 2017
• Subjects: mud volcano; underground water; isotopic composition; hydrogeochemistry; hydrochemical geothermometers; Sakhalin Island; Sakhalin
• Online Access: https://dx.doi.org/10.23683/0321-3005-2017-4-1-110-120; https://hub.sfedu.ru/repository/material/800818890/?direct_link=true

We determined the isotopic and chemical composition of the Yuzhno-Sakhalinsk mud volcano waters. Sampling was conducted in 2009 and 2010 at stage of the gryphon-salse activity of the volcano. It is established that mud vol-canic waters belong to the hydrocarbonate-chloride-sodium type, total mineralization is 16-23 g/l. We estimate for-mation temperature of the mud volcanic waters according to hydrochemical geothermometers. Based on this estimates it is assumed that aquifers lie at the depth of 3 km and more, which feed the mud volcano. The isotopic characteristics of mud volcanic waters (δ18О ~ +5 ‰, δD ~ –20 ‰) indicate minor contribution of meteoric waters in the water supply of the volcano. A hypothesis is proposed that the chemical composition of mud volcanic waters is largely determined by the entry of mud volcanic gases (carbon dioxide predominates) into volcano channel. The hypotheses of formation of the isotope composition of the waters of the Yuzhno-Sakhalinsk mud volcano are also discussed. The original source of the aqueous phase of the mud volcanic substance is buried seawater.