Petrochemistry and mineralogy of pumice from the Sarychev Peak Volcano, Matua Island, Central Kuril Island
https://doi.org/10.32454/0016-7762-2022-64-2-57-67
Abstract
Background. The article presents the first results of a mineralogical and petrographic study of the pumice of the Sarychev Peak volcano, Matua island, the Central Kuril islands.
Aim. To reconstruct the compositions of magmatic melts of a caldera-forming eruption of the proto-Matua volcano.
Materials and methods. The main research methods included an X-ray fluorescence spectral analysis to determine the content of petrogenic, rare and trace elements, as well as an electron-probe microanalysis to study variations in the chemical composition of mineral inclusions of pumice.
Results and conclusion. According to the content of SiO2 and the sum of alkalis, the composition of pumice varies from andesibasaltes (SiO2 = 55.94 wt.%) to dacites (SiO2 = 67.70 wt.%). According to the content of K2O, pumice can be classified as a moderate-potassium series of rocks. The inclusion minerals represented by plagioclase, amphibole, apatite and Fe-Ti oxides were crystallized at the same time from a water-saturated magmatic melt at a pressure of about 1.5–2.2 kbar. The igneous melt was enriched with volatile components of H2O, CO2, S, F and Cl.
Supporting agencies: research was carried out on the subject of the State Assignment of the IViS FEB RAS No. 0282-2019-0007. Acknowledgments: The authors thank the Russian Geographic Society represented by I.М. Viter and E.M. Vereshchaga for the invitation to participate in XXI and XXII Kurile-Kamchatka expeditions in 2017 and 2018. Authors thank V.V. Kulikov and A.A. Platonov for the preparation of the polish sections for detailed ingestions. The authors also thank Ananyev V.V. for a help in calculating the minerals formulas.
About the Authors
V. M. Okrugin
Institute of Volcanology and Seismology, Far Eastern Branch, RAS
Russian Federation
Russian Federation
Victor M. Okrugin — Cand. Sci. (Geol-Min.), head of the laboratory the volcanic ore genesis
9, Boulevard Piip, Petropavlovsk-Kamchatsky 683006
SPIN-code: 7131-5358
E. D. Skilskaia
Institute of Volcanology and Seismology, Far Eastern Branch, RAS
Russian Federation
Russian Federation
Elena D. Skilskaia — Cand. Sci. (Geol.-Min.), senior researcher, the volcanic ore genesis laboratory
9, Boulevard Piip, Petropavlovsk-Kamchatsky 683006
SPIN-code:1277-9244
S. V. Moskaleva
Institute of Volcanology and Seismology, Far Eastern Branch, RAS
Russian Federation
Russian Federation
Svetlana V. Moskaleva — researcher, the volcanic ore genesis laboratory
9, Boulevard Piip, Petropavlovsk-Kamchatsky 683006
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Review
For citations:
Okrugin V.M., Skilskaia E.D., Moskaleva S.V. Petrochemistry and mineralogy of pumice from the Sarychev Peak Volcano, Matua Island, Central Kuril Island. Proceedings of higher educational establishments. Geology and Exploration. 2022;(2):57-67. (In Russ.) https://doi.org/10.32454/0016-7762-2022-64-2-57-67
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