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

The formation conditions of the parental magmas of Gorely volcano, which is located behind a volcanic front in Southern Kamchatka, have been evaluated using the modern methods of micro-element thermobarometry. These magmas contained 1.7 ± 0.8 (2σ) wt % of H2O, the majority (82%) of which has been lo...

Full description

Bibliographic Details
Published in:Doklady Earth Sciences
Main Authors: Nazarova, D. P., Portnyagin, Maxim V., Krasheninnikov, S. P., Mironov, N. L., Sobolev, A. V.
Format: Article in Journal/Newspaper
Language:English
Published: Springer 2017
Subjects:
Kamchatka
Online Access:https://oceanrep.geomar.de/id/eprint/37760/
https://oceanrep.geomar.de/id/eprint/37760/1/2017_Nazarova%20et%20al.pdf
https://doi.org/10.1134/S1028334X1701024X
Description
Summary:The formation conditions of the parental magmas of Gorely volcano, which is located behind a volcanic front in Southern Kamchatka, have been evaluated using the modern methods of micro-element thermobarometry. These magmas contained 1.7 ± 0.8 (2σ) wt % of H2O, the majority (82%) of which has been lost from inclusions. They crystallized at 1121 ± 17°C and an oxygen fugacity of ΔQFM 1.2 ± 0.2, and could have been produced by about 11% melting of an enriched MORB source (E–DMM) at a temperature of about 1270°C, and a pressure of about 1.5 GPa. A distinctive feature of Gorely volcano, compared with frontal volcanoes of Kamchatka, is the unusually high temperature (925 ± 20°C) of formation of the subduction component corresponding to the region of existence of water-bearing melts.

Similar Items