The Magnetic Field in the Geothermal Systems of the Pauzhetka Area, Southern Kamchatka

• Published in: Journal of volcanology and seismology Vol. 17; no. 2; pp. 102 - 118
• Main Authors: Nuzhdaev, I. A., Rychagov, S. N., Feofilaktov, S. O., Denisov, D. K.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.04.2023; Springer Nature B.V
• Subjects: Aquifers; Earth and Environmental Science; Earth Sciences; Fluids; Geochemistry; Geological faults; Geology; Geophysics/Geodesy; Geothermal fields; Heat flow; Heat transmission; Hydrothermal fields; Magnetic anomalies; Magnetic field; Magnetic fields; Magnetic induction; Tectonics; negative and positive anomalies; geothermal systems and fields; magnetic field; geological structure; thermal fields; zones of steam and hydrothermal fluid discharge
• ISSN: 0742-0463; 1819-7108
• DOI: 10.1134/S0742046322060033

Our multiyear studies have enabled us to make maps showing magnetic anomalies Δ T a for major geothermal systems in the Pauzhetka area of southern Kamchatka. Magnetic fields possess both general characteristics and individual features for each object of study. The Nizhne-Koshelev vapor-dominated geothermal field is identified on the basis of a set of linear negative magnetic anomalies confined to thermal-controlling tectonic faults. The Pauzhetka geothermal field is characterized by an inhomogeneous structure of the anomalous magnetic field Δ T a : the northwestern area has a quiet, slightly negative magnetic field, showing that this part of the field is dominated by lateral spreading of hydrothermal fluids from the upper aquifer; the southeastern part has numerous sign-varying magnetic anomalies of high intensity confined to acid–intermediate subvolcanic bodies. The South Kambalnyi group of thermal fields is characterized by a lower absolute value of magnetic induction Т compared with the Pauzhetka and the Nizhne-Koshelev geothermal fields, showing that the rocks of the Kambalnyi volcanic range are more intensely altered by hydrothermal and metasomatic processes, probably as a result of a long-continued action of convective heat flow.