Utilization of Host Rocks, E.G. Serpentinite, Recovered Upon Integrated Mining of a Deposit

Ilyina, Vera

doi:10.5593/sgem2016/b12/s03.127

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“…The presence of phlogopite in peridotites, quartz, biotite and K-feldspar associations in pigeonitebearing gabbronorites, as well as inclusions of quartz-carbonate composition in pyroxenites from the zone of the same name, indicate post-magmatic metasomatism and the addition of Sr-enriched fluids. There are carbonate-bearing serpentinites in the Aganozero Block, at a depth of up to 70 m. Hydrotalcitic-lizarditic serpentinites with chlorite, carbonate, and high concentrations of acid-dissolvable forms of Ni, Mg, and Fe occur at deeper horizons [53]. The high 87 Sr/ 86 Sr ratio of 0.7033 upon dunite alteration suggests that enrichment in Sr was primarily due to carbonate.…”

Section: Comparative Analysis Of Geochemical and Isotopic Datamentioning

confidence: 99%

Layered Intrusions of Paleoproterozoic Age in the Kola and Karelian Regions

2023

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Large-scale layered intrusions of a peridotite–pyroxenite–gabbronorite complex, to which Cr, Ni, Cu, and PGE deposits and ore occurrences are confined, were emplaced into the Baltic paleocontinent 2.50–2.45 Ga. Layered intrusions in the Monchegorsk Ore District, including the Monchepluton and Imandra–Umbarechka Complex, as well as the gabbro-anorthosite complex of the Main Ridge, were analyzed earlier geochemically and isotopically. In the present paper, the authors analyze layered intrusions in the Kola region (Mount Generalskaya) and Karelia (Kivakka, Kovdozero, and the Burakovsky Pluton). The primary composition of mantle magmas for the layered intrusions is assumed to be identical to that of the komatiitic basalts making up the volcanogenic units of the Vetreny Belt and the Imandra–Varzuga zone. A general model for the formation of layered intrusions includes superplume uplift in the early Paleoproterozoic, the generation of mantle magmas and their injection into the lower portion of the earth crust, the formation of deep-seated and intermediate magma chambers, and the intense contamination of the granulite–metamorphic complex followed by the generation of magma chambers provoked by single or multiple injections.

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Section: Comparative Analysis Of Geochemical and Isotopic Datamentioning

confidence: 99%