Geodynamic Evolution and Metallogeny of Archaean Structural and Compositional Complexes in the Northwestern Russian Arctic

Abstract

This paper highlights the geodynamic evolution of the early Precambrian rock associations in the northwestern part of the Russian Arctic where the rocks are exposed in the Kola region (northeastern Baltic Shield). The evolution is shown to predetermine the metallogenic potential of the area. It is emphasized that the Earth’s evolution is a non-linear process. Thus, we cannot draw direct analogies with Phanerozoic time or purely apply the principle of actualism, which is still widely used by experts in Precambrian geology to study the premetamorphic history of ancient deposits. In both cases, the principles should be adjusted. This article provides a novel technique for reconstructing geodynamic regimes of protolith formation in the early Precambrian. The technique identifies changing trends in geodynamic regimes during the formation of the Archean structural and compositional complexes in the Kola region. These trends fit into the earlier suggested general scheme of their formation, thus enhancing its reliability. The metallogeny of the ore areas is specified. The results of the geodynamic reconstructions explain most of the location patterns of minerals within the Kola region. Thus, the authors consider the metallogenic forecast based on geodynamic reconstructions to be a promising trend for further research.

Carbon Sources and the Graphitization of Carbonaceous Matter in Precambrian Rocks of the Keivy Terrane (Kola Peninsula, Russia)

“…Nevertheless, the coexistence of isotopic signatures resembling those of natural gases and oils allows us to assume the existence of a Precambrian oil-and-gas-bearing basin within a considerable area of the Keivy Terrane. This hypothesis is supported by recent geodynamic reconstructions, according to which the Keivy Terrane ("domain") could have been a "median massif" during the Neoarchean period, which is often characterized by the presence of hydrocarbon deposits [68].…”

Using Petrogeochemical Modeling to Understand the Relationship between Paleozoic Magmatism in the Kola Region and Its Precambrian History

“…Figure 2). (9)-(11) ultrabasic-basic magmatic rocks of the Paleoproterozoic (9) and Paleozoic (10) Kola region, and an average composition of ultrabasic-basic rocks that formed Neoarchean proto-island arc belts, and later structures of the Kola region up to the Paleozoic (11).…”

“…The difference in chemical rock composition in the transition from the Lapland Granulite Belt to other granulite belts of Eurasia was described by searching for a trend of differences with regard to the partial order introduced by a researcher into a preset aggregate of data sets. This method has been applied and detailed by authors in other studies [11]. Provided below are amendments to the method in the applied mathematical model for completing the new tasks in our research.…”

“…This ensures a high reliability of the resulting statistic conclusions. This criterion was used by others in numerous studies (e.g., Kozlov et al [11]), which showed a high efficiency in the processing of a large volume of geochemical data. Hence, the ratios Me(Yc) < M(Zc i ) and Λ(Yc,Zc i ) > χ 2 (δ) were executed for each sample, V i , where Λ(Yc,Zc i ) is the value of the Puri-Sen-Tamura statistics for sets Yc and Zc i , and χ 2 (δ) is the value of the χ 2 -inverse distribution for the selected significance level δ.…”

Геодинамика И Металлогеническая Специализация Раннего Докембрия Кольского Региона

“…Анализ металлогенической специализации коллизионных зон (Сорохтин и др., 2017) позволяет предполагать формирование в его пределах повышенных концентраций, определявшихся раннедокембрийской геодинамикой формирования его протолитов, еще как минимум для титана, марганца, вана-дия, хрома, а также, возможно, меди, никеля и железа. Некоторые аспекты данной проблемы рассмотрены нами в ходе предыдущих исследований (Kozlov et al, 2018). Данной проблеме посвящена и настоящая работа.…”