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- Title
Conditions of Formation of Layered Intrusions of the Monchegorsk Magmatic Cluster.
- Authors
Semenov, V. S.; Kazanov, O. V.; Korneev, S. I.; Salnikova, E. B.; Semenov, S. V.
- 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.
- Subjects
MAGMAS; OLIVINE; ZIRCON; MELTING; MAGNESIUM oxide; IGNEOUS intrusions
- Publication
Petrology, 2022, Vol 30, Issue 4, p369
- ISSN
0869-5911
- Publication type
Academic Journal
- DOI
10.1134/S0869591122030079