Melt inclusions were investigated in the minerals of dacite tephra of the largest Holocene eruption (7900 years) of Khangar volcano, Sredinny Range of Kamchatka. Melt compositions correspond to rhyolite (SiO2 = 70–77 wt %, Na2O+K2O = 6–7 wt %) with ~5 wt % H2O. The melts show a minor negative Nb anomaly and lesser HREE depletion (La/Yb is ~7.1) compared to those of Ichinsky Volcano, another active volcano of the Sredinny Range of Kamchatka. It was determined that different phenocryst assemblages were formed within temperature ranges of 750–785 and 830–870°C. Evidence for the assimilation of granite-gneiss basement by magmas of Khangar volcano are discussed.
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We are grateful to M.V. Portnyagin and N.L. Mironov for constructive recommendations.
This work was made in the frameworks of the State Task of the GEOKHI and GIN RAS (project nos. 0137-2019-0014 and 0135-2019-0058), with partial financial support of the Russian Foundation for Basic Research (project no. 18-05-00224).
Translated by M. Bogina
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Tolstykh, M.L., Naumov, V.B., Pevzner, M.M. et al. Geochemical Features of Magmas of the Largest Holocene Eruption of Khangar Volcano (Sredinny Range, Kamchatka): Melt Inclusion Evidence. Geochem. Int. 59, 139–155 (2021). https://doi.org/10.1134/S0016702921020087
- Sredinny Range
- melt inclusion