MACROCOMPONENT COMPOSITION AND GENESIS OF PORE SOLUTIONS OF THE PAUZHETKA GEOTHERMAL DEPOSIT (SOUTH KAMCHATKA)
S.N. Rychagov, A.V. Sergeeva, O.V. Kravchenko, A.A. Kuzmina
Institute of Volcanology and Seismology, Far Eastern Branch of the Russian Academy of Sciences, Petropavlovsk-Kamchatsky, Russia
Keywords: pore solutions, water extracts, hydrothermal clays, geothermal deposit, alkaline metal-bearing fluid, mineral formation
Abstract
The main composition of pore solutions of the hydrothermal clays forming extended and powerful thicklayersin on thermal fields of the Pauzhetka geothermal deposit is studied. In vertical cuts of hydrothermal clays two zones differing in physical and chemical characteristics, compositions and conditions of formation of pore solutions are allocated. The crucial role of pH in change of macrocomponent composition of solutions depending on section depth is shown. The conclusion is drawn on formation of pore solutions as a result of direct impact on a matrix of hydrothermal clays of infiltration deep thermal waters, at which there are processes of redistribution of elements between rock and contact solution. Along with the general regularities, essential differences in the conditions of formation of composition of pore solutions on Upper and East Pauzhetsky thermal fields are revealed that is defined by a geological position and the hydrogeochemical regime of concrete sites of the geothermal deposit.
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