Initial H2O content and conditions of parent magma origin for Gorely volcano (Southern Kamchatka) estimated by trace element thermobarometry

Gorely volcano, located behind the volcanic front in Southern Kamchatka, exhibits unique magma formation conditions distinct from frontal volcanoes. Research reveals that its parental magmas contained 1.7 ± 0.8 wt % H₂O, with most lost during crystallization, and formed at exceptionally high temperatures (1121 ± 17°C) under an oxygen fugacity of ΔQFM 1.2 ± 0.2. These magmas likely originated from approximately 11% melting of an enriched MORB source at ~1270°C and 1.5 GPa, with a notable subduction component forming at 925 ± 20°C—higher than typical for Kamchatka. The study employed trace element thermobarometry to unravel these conditions, offering insights into the geochemical processes shaping this rear-arc volcanic system.

Nazarova, D. P., Portnyagin, M. V., Krasheninnikov, S. P., Mironov, N. L., & Sobolev, A. V. (2017). Initial H2O content and conditions of parent magma origin for Gorely volcano (Southern Kamchatka) estimated by trace element thermobarometry. Doklady Earth Sciences, 472(1), 100–103. https://doi.org/10.1134/s1028334x1701024x