Major and trace element composition of melts from the Gorely volcanic center, southern Kamchatka ...

• Main Authors: Tolstykh, M L, Naumov, V B, Gavrilenko, M G, Ozerov, AYu, Kononkova, N N
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2012
• Subjects: Archive of Ocean Data ARCOD; Kamchatka
• Online Access: https://dx.doi.org/10.1594/pangaea.793071; https://doi.pangaea.de/10.1594/PANGAEA.793071

Melt inclusions in olivine and plagioclase phenocrysts from rocks (magnesian basalt, basaltic andesite, andesite, ignimbrite, and dacite) of various age from the Gorely volcanic center, southern Kamchatka, were studied by means of their homogenization and by analyzing the glasses in 100 melt inclusions on an electron microprobe and 24 inclusions on an ion probe. The SiO2 concentrations of the melts vary within a broad range of 45-74 wt%, as also are the concentrations of other major components. According to their SiO2, Na2O, K2O, TiO2, and P2O5 concentrations, the melts are classified into seven groups. The mafic melts (45-53 wt% SiO2) comprise the following varieties: potassic (on average 4.2 wt% K2O, 1.7 wt% Na2O, 1.0 wt% TiO2, and 0.20 wt% P2O5), sodic (3.2% Na2O, 1.1% K2O, 1.1% TiO2, and 0.40% P2O5), and titaniferous with high P2O5 concentrations (2.2% TiO2, 1.1% P2O5, 3.8% Na2O, and 3.0% K2O). The melts of intermediate composition (53-64% SiO2) also include potassic (5.6% K2O, 3.4% Na2O, 1.0% TiO2, and ... : Supplement to: Tolstykh, M L; Naumov, V B; Gavrilenko, M G; Ozerov, AYu; Kononkova, N N (2012): Chemical composition, volatile components, and trace elements in the melts of the Gorely volcanic center, southern Kamchatka: Evidence from inclusions in minerals. Geochemistry International, 50(6), 522-550 ...