Water in Parental Basaltic Magmas of Menshyi Brat Volcano (Iturup Island, Kurile Islands)
- Authors: Nizametdinov I.R.1,2, Kuzmin D.V.1,2, Smirnov S.Z.1, Rybin A.V.3, Kulakov I.Y.4
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Affiliations:
- Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences
- Novosibirsk State University
- Institute of Marine Geology and Geophysics, Far East Branch, Russian Academy of Sciences
- Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of Sciences
- Issue: Vol 486, No 1 (2019)
- Pages: 525-528
- Section: Geochemistry
- URL: https://journals.rcsi.science/1028-334X/article/view/194954
- DOI: https://doi.org/10.1134/S1028334X19050052
- ID: 194954
Cite item
Abstract
Data from the study of minerals of the liquidus association (olivine and spinel) from high-Mg basalts (up to 10 wt % MgO) of Menshyi Brat Volcano (Iturup Island) are reported. Based on these data, it was possible to estimate the water content and to study the evolution of volatile components in the primary basic magmas that formed the Medvezhia Caldera (Irurup Island), for the first time. It is shown that the initial water content in melts could reach 5 wt % at an oxygen fugacity corresponding to the NNO + 0.4 buffer. The further evolution of magmas included continuous degassing at a depth of ≤8 km. Hydrous fluid separated from basic magma could play a significant role in the formation of large crustal chambers of siliceous magma participation in catastrophic caldera eruptions.
About the authors
I. R. Nizametdinov
Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences; Novosibirsk State University
Author for correspondence.
Email: inizametdimov@igm.nsc.ru
Russian Federation, Novosibirsk, 630090; Novosibirsk, 630090
D. V. Kuzmin
Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences; Novosibirsk State University
Email: inizametdimov@igm.nsc.ru
Russian Federation, Novosibirsk, 630090; Novosibirsk, 630090
S. Z. Smirnov
Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences
Email: inizametdimov@igm.nsc.ru
Russian Federation, Novosibirsk, 630090
A. V. Rybin
Institute of Marine Geology and Geophysics,Far East Branch, Russian Academy of Sciences
Email: inizametdimov@igm.nsc.ru
Russian Federation,
Yuzhno-Sakhalinsk, 693022
I. Yu. Kulakov
Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of Sciences
Email: inizametdimov@igm.nsc.ru
Russian Federation,
Novosibirsk, 630090