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Basalt alteration in high-temperature oxidizing-type fumaroles at the Tolbachik volcano (Kamchatka, Russia). Part 2: Gas metasomatitesстатья
- Авторы: Bulakh M.O., Pekov I.V., Koshlyakova N.N., Nazarova M.A.
- Журнал: Geology of Ore Deposits
- Том: 66
- Номер: 8
- Год издания: 2024
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 1083
- Последняя страница: 1122
- DOI: 10.1134/S1075701524700259
- Аннотация: Five specific types of silicate apobasaltic gas metasomatites formed in the temperature range from850–900 to 450–500°C have been identified and characterized in oxidizing-type fumaroles at the Tolbachikvolcano (Kamchatka, Russia): (1) diopside–esseneite, (2) haüyne–diopside, (3) anorthoclase/Na-sanidine,(4) sanidine, and (5) fluorophlogopite/sanidine–fluorophlogopite metasomatites. Exhalation incrustationsof certain mineral and chemical composition are related to each of these types. In the vertical section of thefumarole system from bottom to top, against the background of volcanic-gas cooling, a sequential spatialchange of the first four types of gas metasomatites occurs. Fluorophlogopite and sanidine–fluorophlogopitegas metasomatites do not have a clear position in the vertical section of the fumarole system and presumablyare formed under the action of a gas significantly enriched with Cl and F. Highly siliceous metasomatites,consisting mainly of silica phases, form instead of silicate rocks at temperatures below 450–500°C.
- Добавил в систему: Булах Мария Олеговна