Multi-Cyclic and Isotopically Diverse Silicic Magma Generation in an Arc Volcano: Gorely Eruptive Center, Kamchatka, Russia

Research on the Gorely Eruptive Center in Kamchatka reveals that large-volume, isotopically distinct silicic magma can be generated rapidly through a combination of fractional crystallization and assimilation of older crustal material. The study identifies two distinct magmatic trends—silicic and mafic—and demonstrates that low δ¹⁸O values, elevated ⁸⁷Sr/⁸⁶Sr ratios, and low ¹⁴³Nd/¹⁴⁴Nd ratios suggest contamination by older, hydrothermally altered country rocks. Additionally, the presence of glomerocrysts and mafic enclaves indicates episodic magmatic activity, while elevated Nb concentrations hint at an enriched component possibly linked to lower crustal delamination. The findings challenge traditional views of magma generation in long-term eruptive centers, suggesting a dynamic interplay between magmatic processes and glacial cycles.

Seligman, A., Bindeman, I., Jicha, B., Ellis, B., Ponomareva, V., & Leonov, V. (2014). Multi-Cyclic and Isotopically Diverse Silicic Magma Generation in an Arc Volcano: Gorely Eruptive Center, Kamchatka, Russia. Journal of Petrology, 55(8), 1561–1594. https://doi.org/10.1093/petrology/egu034