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Petrology

, Volume 25, Issue 6, pp 566–591 | Cite as

2.5 Ga gabbro-anorthosites in the Belomorian Province, Fennoscandian Shield: Petrology and tectonic setting

  • A. V. Stepanova
  • V. S. Stepanov
  • A. N. Larionov
  • P. Ya. Azimov
  • S. V. Egorova
  • Yu. O. Larionova
Article
  • 51 Downloads

Abstract

The Vorochistoozersky, Nizhnepopovsky, and Severo-Pezhostrovsky gabbro-anorthosite massifs have been studied in the central part of the Belomorian Province, Fennoscandian Shield. The similarity of geological setting and rock composition of these massifs suggests their affiliation to a single complex. The age of the gabbro-anorthosites was determined by U-Pb (SHRIMP II) zircon dating of gabbro-pegmatites from the Vorochistoozersky massif at 2505 ± 8 Ma. The studied massifs were overprinted by the high-pressure amphibolite facies metamorphism. Relicts of magmatic layering and primary magmatic assemblages preserved in the largest bodies. The massifs consist mainly of leucocratic gabbros but also contain rocks of the layered series varying in composition from olivinite to anorthosite. The presence of troctolites in the layered series indicates the stability of the olivine–plagioclase liquidus assemblage and, respectively, shallow depths of melt crystallization. Despite the composition differences between gabbro-anorthosites of the Belomorian and peridotite–gabbronorite intrusions Kola provinces, these simultaneously formed massifs presumably mark a single great igneous event. It also includes the gabbronorite dikes in the Vodlozero terrane of the Karelian province, the Mistassini swarm in the Superior province, and the Kaminak swarm in the Hearne Craton, Canadian Shield. The large igneous province of age ~2500 Ma reflects the oldest stage of within-plate magmatism after a consolidation of the Neoarchean crust of the Kenorland Supercontinent (Superia supercraton).

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Supplementary material

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Supplementary materials for Stepanova A.V., Stepanov V.S., Larionov A.N., Azimov P.Ya., Egorova S.V., Larionova Yu.O. The 2.5 Ga gabbro-anorthosites in the Belomorian province, Eastern Fennoscandian Shield: petrology and tectonic setting

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Copyright information

© Pleiades Publishing, Ltd. 2017

Authors and Affiliations

  • A. V. Stepanova
    • 1
    • 2
  • V. S. Stepanov
    • 1
  • A. N. Larionov
    • 3
  • P. Ya. Azimov
    • 4
  • S. V. Egorova
    • 1
    • 2
  • Yu. O. Larionova
    • 2
  1. 1.Institute of Geology, Karelian Research CentreRussian Academy of SciencesPetrozavodskRussia
  2. 2.Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM)Russian Academy of SciencesMoscowRussia
  3. 3.Center of Isotopic ResearchKarpinsky Russian Geological Research InstituteSt. PetersburgRussia
  4. 4.Institute of Precambrian Geology and GeochronologyRussian Academy of SciencesSt. PetersburgRussia

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