Chemical composition of rocks and minerals from the Karymsky volcanic center, Eastern Kamchatka ...

• Main Authors: Portnyagin, Maxim V, Naumov, V B, Mironov, N L, Belousov, I A, Kononkova, N N
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2011
• Subjects: Outcrop sample; Archive of Ocean Data ARCOD; Kamchatka
• Online Access: https://dx.doi.org/10.1594/pangaea.786839; https://doi.pangaea.de/10.1594/PANGAEA.786839

The powerful eruption in the Akademii Nauk caldera on January 2, 1996 marked a new activity phase of the Karymsky volcano and became a noticeable event in the history of modern volcanism in Kamchatka. The paper reports data obtained by studying more than 200 glassy melt inclusions in phenocrysts of olivine (Fo82-72), plagioclase (An92-73), and clinopyroxene (Mg# 83-70) in basalts of the 1996 eruption. The data were used to estimate composition of the parental melt and physicochemical parameters of the magma evolution. According to our data, the parental melt corresponded to low magnesium, high aluminum basalt (SiO2 = 50.2%, MgO = 5.6%, Al2O3 = 17%) of the mildly potassium type (K2O = 0.56%) and contained much dissolved volatile components (H2O = 2.8%, S = 0.17%, and Cl = 0.11%). Melt inclusions in the minerals are similar in chemical composition, a fact testifying that the minerals crystallized simultaneously with one another. Their crystallization started at pressure ~1.5 kbar, proceeded within a narrow ... : Supplement to: Portnyagin, Maxim V; Naumov, V B; Mironov, N L; Belousov, I A; Kononkova, N N (2011): Composition and evolution of the melts erupted in 1996 at Karymskoe Lake, Eastern Kamchatka: Evidence from inclusions in minerals. Translated from Geokhimiya, 2011, 49(11), 1153-1178, Geochemistry International, 49(11), 1085-1110 ...