The Composition and Formation Conditions of Nitrogen–Siliceous Thermal Waters of the Amgu Group (Northeast of the Primorsky Krai)

• Published in: Russian journal of Pacific geology Vol. 18; no. 2; pp. 198 - 209
• Main Authors: Bragin, I. V., Pavlov, A. A., Chelnokov, G. A., Lavrushin, V. Yu, Kharitonova, N. A.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.04.2024; Springer Nature B.V
• Subjects: Bicarbonates; Earth and Environmental Science; Earth Sciences; Geology; Lithium; Low temperature; Magma; Mineralization; Molybdenum; Neotectonics; Nitrogen; Reservoirs; Silica; Sodium; Thermal water; Tungsten; Water resources; Far East of Russia; stable isotopes; nitrogen–siliceous thermal waters; Amgu; rare-earth elements; Teplyi Klyuch; multicomponent geothermometry
• ISSN: 1819-7140; 1819-7159
• DOI: 10.1134/S1819714024020039

This article presents new data on the ionic, microcomponent, and isotope compositions of thermal waters of the Amgu group classified as sodium-bicarbonate waters with low mineralization (up to 0.2 g/L), high contents of silica (up to 24 mg/L), lithium, tungsten, and molybdenum, and pH = 8.5–9.7. The influence of neotectonics and Quaternary magmatism on the composition and conditions of formation of nitrogen–siliceous thermal waters is shown. Using δD and δ 18 O values in thermal and background waters, their atmogenic origin was proved, and the source area of mineral waters was identified. The calculated deep reservoir temperature of 77–81°С indicates the formation of water resources in the crust at significant depths (as much as 2.5 km). The efficiency of using the multicomponent geothermometry method for low-temperature reservoirs is shown.