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Supplement: 1 (xlsx)
Vol 279
Pages:
132-151
In press
Article
Geology

Conditions of formation of the Gubanov intrusion of rapakivi granites (Wiborg massif)

Authors:
Alexey V. Berezin1
Ilona V. Rogova2
Sergey G. Skublov3
Evgeny I. Grokhotov4
About authors
  • 1 — Ph.D. Senior Researcher Institute of Precambrian Geology and Geochronology RAS ▪ Orcid
  • 2 — Postgraduate Student Empress Catherine II Saint Petersburg Mining University ▪ Orcid
  • 3 — Ph.D., Dr.Sci. Chief Researcher Institute of Precambrian Geology and Geochronology RAS ▪ Orcid ▪ Elibrary ▪ Scopus
  • 4 — Executive Director of the Problem Oriented Laboratory Empress Catherine II Saint Petersburg Mining University ▪ Orcid
Date submitted:
2025-07-02
Date accepted:
2025-12-24
Online publication date:
2026-06-26

Abstract

The article is devoted to determining the P-T conditions and formation mechanisms of the Gubanov intrusion (Wiborg rapakivi granite massif) using a suite of petrographic and geochemical methods combined with thermodynamic modelling (rhyolite-MELTS, machine learning). Microstructural analysis of plagioclase resorption made it possible for the first time to estimate the vertical dimension of the intermediate magma chamber at 1.5-2 km and the crystal accumulation/settling timescale (< 0.2 Ma) as the duration of the early stage of rock crystallization. Combined thermobarometry (mineral equilibria, ML algorithms, rhyolite-MELTS) constrained the crystallization interval to T = 840-660 °C, P = 5.5-4.0 kbar at fO2 ≈ FMQ and H2O in the melt ≈ 6-10 wt.%. It is shown that the rocks of the contact zone between phases formed by partial melting of phase 2 material (producing a melt with 80-84 wt.% SiO2) triggered by phase 3 melt and subsequent mixing of these components. The results refine the evolutionary model of the Wiborg massif and demonstrate the effectiveness of integrating traditional and modelling petrology methods.

Область исследования:
Geology
Keywords:
rapakivi granites Wiborg massif Gubanov intrusion thermobarometry fractional crystallization rhyolite-MELTS magmatic processes fluids post-collisional magmatism
Funding:

Petrological modeling was carried out within the framework of the research topic of IPGG RAS “Improvement of isotopic dating methods for Precambrian complexes and development of new geochemical approaches to the use of geochronometer minerals” (FMUW-2022-0005). Fieldwork and sample preparation were supported by the State assignment of Empress Catherine II Saint Petersburg Mining University “Fundamental interdisciplinary studies of the Earth's crust and processes of integrated development of georesources” (FSRW-2023-0002).

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