THERMAL SPRINGS HYDROGEOCHEMISTRY AND STRUCTURE AT NORTH-

North-Mutnovskoe fumarolic field is the compact group of thermal springs. It locates in the volcano-tectonic zone of the Mutnovsky volcano in an oval deepening with low borders and flat bottom. About 20 strong vapor jets with the charge more than 0.03 kg/sec and temperature 96 – 110 °С are situated there. Hot small lake and tens of mud pots locate on the lowered sites. The thermal field area is 5.5•103 m2. Whole variety of mud pots was sampled in 2006-2007. In situ pH, Eh, T, and anions Cl-, F-, NO3-, NO2- were measured after some sedimentation of suspension. The samples were filtered using a 0.45 µm membrane filter. Humid solids from mud po