Chrome-Spinelides from Layered Intrusions of the Paleoproterozoic Fennoscandian Shield as Indicators of Petro - and Ore Genesis

Smolkin, V. F.; Mokrushin, A. V.

doi:10.1007/978-3-031-23390-6_30

Cited by 1 publication

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“…At the 2.50 Ga boundary, the long-lived mantle plume was uplifted and mantle magma beneath Baltica Paleocontinent was generated in what is now the Kola-Lapland-Karelian Province of the oldest eastern portion of the Fennoscandian Shield [9]. As a result of the uplift of abundant primary mantle magma into the lower earth crust, it was heated and disrupted; paleorift-related systems, filled with various sedimentary and volcanogenic rock complexes, then formed.…”

Section: Layered Intrusion Formation Patternmentioning

confidence: 99%

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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: Layered Intrusion Formation Patternmentioning

confidence: 99%

“…Two types of layered intrusions were identified based on geological evidence and the results of U-Pb and Sm-Nd isotope analyses [6][7][8][9]. The older (2.53-2.48 Ga) Kola Group consists of several intrusions: Mt.…”

Section: Introductionmentioning

confidence: 99%