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Conditions of Formation of Layered Intrusions of the Monchegorsk Magmatic Cluster

Abstract

The paper presents geochronological data and results of petrological modeling of the Monchegorsk and Monchetundra layered massifs. The U-Pb ID-TIMS zircon dating of norite from the marginal zone of Mt. Nittis yielded 2506 ± 7 Ma, which coincides with previous data on similar rocks from other areas. Based on the comparison of sections of the Monchegorsk and Kivakka massifs, the pre-erosion thickness of the Monchegorsk massif is estimated as 3700 m. Calculations using rocks of the marginal zone of the Monchegorsk intrusion at a pressure of 6.5–5.5 kbar showed that the melt in equilibrium with Ol contained SiO2 ≤ 55 wt %, TiO2 ≤ 0.50 wt %, and MgO ≤14 wt %. The temperature of the primary magma could be equal to 1390°C. At a lower pressure (below 6.5 kbar), the obtained melt becomes more siliceous. In the Monchegorsk intrusion, the composition of intratelluric olivine according to this model could vary within 88–92 mol % Fo. The content of intratelluric olivine in the melt, depending on pressure, could vary from 11 to 24 vol %. Magmas that formed the Monchegorsk intrusion and the layered series of the Monchetundra intrusion (hole 742) were derived from different sources.

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ACKNOWLEDGMENTS

We are grateful to G.P. Pleskach (IPGG RAS) for help in the manuscript preparation. We also thank reviewers E.V. Koptev-Dvornikov and A.M. Larin.

Funding

This work was made in the framework of the government-financed project of the IPGG RAS (project no. FMUW-2021-0002, registration number АААА-А21-121011190056-7).

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Correspondence to V. S. Semenov, O. V. Kazanov or S. I. Korneev.

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Translated by M. Bogina

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Semenov, V.S., Kazanov, O.V., Korneev, S.I. et al. Conditions of Formation of Layered Intrusions of the Monchegorsk Magmatic Cluster. Petrology 30, 369–391 (2022). https://doi.org/10.1134/S0869591122030079

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  • DOI: https://doi.org/10.1134/S0869591122030079

Keywords:

  • Monchegorsk and Monchetundra layered massifs
  • cumulates
  • geochronological age
  • micrograined rocks
  • melt
  • magma