Bindeman I.N. Petrology of the Golygin ignimbrite (South Kamchatka)
https://doi.org/10.55959/MSU0579-9406-4-2023-63-4-86-98
Abstract
This paper presents the results of a detailed petrological study of a continuous section of the Golygin ignimbrite, related to the Pauzhetka caldera-forming eruption (443±8 ka BP). The continuous zoning of the studied sequence suggests that a large magmatic chamber, emptied during the eruption, was also zoned and had significant vertical dimensions. Our research included determining the bulk composition of rocks, studying samples of the Goligin ignimbrites in thin sections, and detailed studying of quartz and melt inclusions in it. The roof of the magmatic chamber was at a depth of about 5 km; amphibole and plagioclase crystalloclasts in rocks at the base of the sequence show evidence of formation in a more basitic melt at a depth of 24 to 25 km. The composition of the magmatic melt reconstructed from melt inclusions in quartz from this sequence corresponds to medium-K rhyolites (wt %): SiO2 78.1–77.9, Al2O3 12.7–12, FeOt 0.8–0.1, MgO 0.1–0.0, CaO 1.0–0.2, K2O 4.3–3.8, Na2O 4.9–3.3, Cl2 0.1–0.2. Crystallization temperatures calculated for various minerals and their parageneses vary in the range 1009–784°С, which, together with estimates of formation depths of 25 km to 5 km, may reflect nucleation of magmatic melt, its ascent and evolution in a relatively shallow chamber where it was slowly cooled and crystallized. The maximum water content of the magmatic melt during quartz crystallization was estimated at 4.1 to 7.5 wt% H2O.
About the Authors
M. D. Shchekleina
Lomonosov Moscow State University, Fersman Mineralogical Museum RAS
Russian Federation
Russian Federation
P. Yu. Plechov
Lomonosov Moscow State University, Fersman Mineralogical Museum RAS
Russian Federation
Russian Federation
V. D. Shcherbakov
Lomonosov Moscow State University
Russian Federation
Russian Federation
V. O. Davydova
Lomonosov Moscow State University
Russian Federation
Russian Federation
I. N. Bindeman
University of Oregon
United States
United States
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Review
For citations:
Shchekleina M.D., Plechov P.Yu., Shcherbakov V.D., Davydova V.O., Bindeman I.N. Bindeman I.N. Petrology of the Golygin ignimbrite (South Kamchatka). Moscow University Bulletin. Series 4. Geology. 2023;(4):86-98. (In Russ.) https://doi.org/10.55959/MSU0579-9406-4-2023-63-4-86-98
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