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«IZVESTIYA IRKUTSKOGO GOSUDARSTVENNOGO UNIVERSITETA». SERIYA «NAUKI O ZEMLE»
«THE BULLETIN OF IRKUTSK STATE UNIVERSITY». SERIES «EARTH SCIENCES»
ISSN 2073-3402 (Print)

List of issues > Series «Earth Sciences». 2025. Vol 51

Composition Characteristics and Model of Origin of Brecciated Porphyrites of the Shartym Massif (Balbuk Areal, Southern Urals): An Example of Paleovolcanic Analysis

Author(s)
A. A. Samigullin, I. R. Rakhimov
Abstract
The paper considers for the first time the composition of trachyandesite-basaltic porphyrites (including brecciated ones) of the Shartym massif and Pichugin intrusions, which were previously attributed to the diorites and granites of the Balbuk complex of the Southern Urals. Based on the results of petrographic, mineralogical and geochemical studies, 3 types of autoclasts and 1 type of xenoclasts were identified in the brecciated porphyrites. The autoclasts differ slightly from each other in composition, including the density of plagioclase phenocrysts (from 85 to 45 vol.%) and its anorthite content (An68–25–5), which generally corresponds to a single, regularly evolved volcanic system. The xenoclast corresponds to low-potassium trachyte and, according to its geochemical characteristics, it is not related to either brecciated porphyrites or younger rhyolite-porphyry of the Shartym massif. A model of the porphyrite origin related to the activity of a volcanic structure, where the studied rocks correspond to the vent facies, has been developed. Based on geochemical analysis, the time of their occurrence is associated with magmatism of the Balbuk monzonitoid complex (~350 Ma). The rocks have pronounced signs of subduction-related magmatism (negative Nb-Ta-Ti anomaly, positive Pb anomaly), which is quite typical of the Early Carboniferous magmatites of the Magnitogorsk megazone. Younger rhyolite-porphyry of the Shartym massif were intruded in the Late Carboniferous and probably led to strong deformation of the volcanic structure of basaltic trachyandesites.
About the Authors

Samigullin Aidar Alfridovich, Junior Research Scientist, Institute of Geology UFRC RAS, 16/2, Karl Marx st., Ufa, 450077, Russian Federation, e-mail: samigullinaidar85@gmail.com

Rakhimov Ildar Rashitovich, Candidate of Sciences (Geology and Minerology), Senior Research Scientist, Institute of Geology UFRC RAS, 16/2, Karl Marx st., Ufa, 450077, Russian Federation, e-mail: rigel92@mail.ru

For citation
Samigullin A.A., Rakhimov I.R. Composition Characteristics and Model of Origin of Brecciated Porphyrites of the Shartym Massif (Balbuk Areal, Southern Urals): An Example of Paleovolcanic Analysis. The Bulletin of Irkutsk State University. Series Earth Sciences, 2025, vol. 51, pp. 60-79. https://doi.org/10.26516/2073-3402.2025.51.60 (in Russian)
Keywords
Balbuk area, early Carboniferous, trachyandesibasalt, porphyrite, breccia, volcanism, autoclast, xenoclast.
UDC
552.11(470.5)
DOI
https://doi.org/10.26516/2073-3402.2025.51.60
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