A Study in Earth's Geological Evolution

Sorokhtin, N. O.; Kozlov, N. E.; Glaznev, V. N.; Martynov, E. V.

doi:10.1002/9781119651208

Cited by 9 publications

(17 citation statements)

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“…The age of granites was determined by the potassium-argon method on muscovite at 1720-1760 Ma. A combined Pb-Pb Pb 207 /Pb 206 isochron diagram for 11 samples of monazites and zircons from these granites and granitoids of the Litsa-Araguba complex yields an age at 1840 ± 50 Ma (Vinogradov and Vinogradova 1987;Kupriyanova and Kuvshinova 2007;Sorokhtin et al 2020).…”

Section: Metallogenymentioning

confidence: 95%

“…Notably, island-arc related geochemical affinities for the LGB rocks are also evident in different discriminant diagrams (Pearce and Cann 1973;Pears 1976Pears , 1982Bhatia 1983;Mullen 1983;Piskunov 1987) that were widely used in the earlier studies (Kozlov and Ivanov 1991;Kozlov 1995aKozlov , 1995b. In addition to the geochemical discrimination approach, the premetamorphic protolith of the LGB complex was reconstructed using novel techniques developed by Kozlov et al (2017), Martynov et al (2020) and Sorokhtin et al (2020) that assumes a conceptual mantle chemical evolution. This technique was tested and validated with the application to Phanerozoic volcanic arcs in which geodynamic settings are well recognised (Nos.…”

Section: Island-arc Modelmentioning

confidence: 99%

“…This technique was tested and validated with the application to Phanerozoic volcanic arcs in which geodynamic settings are well recognised (Nos. 1, 2 and 3 in Table 4) (Kozlov et al 2017;Martynov et al 2020;Sorokhtin et al 2020). Based on these studies, metavolcanics of the LGB complex can be compared with Phanerozoic island arcs (Bogatikov and Tsvetkov 1988).…”

Section: Island-arc Modelmentioning

confidence: 99%

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Lapland Granulite Belt–Neoarchean subduction zone in the North-Eastern Baltic shield

Kozlov

Martynov

Sorokhtin

2021

Applied Earth Science

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This paper represents a geological review of the Lapland Granulite Belt (LGB). Description of the general geological framework of the LGB complex is coupled with reviews of the geochronological data, metamorphism, mineral endowment and concludes with a discussion of the geotectonic models. It is shown that the belt was formed in the Neoarchean (2703 ± 9 Ma using the U-Pb method) and consists of two compositionally different units. The lower member with dominating amphibolites is interpreted as metamorphosed volcanics, while the upper member is mainly composed of metamorphosed sandstones. It is noted that the composition and structure of the LGB complex are broadly consistent with typical Phanerozoic island-arc complexes. An interpretation of the LGB complex as a Neoarchean island-arc system is proposed. It is consistent with existing geodynamic interpretations of the adjacent terrains and, in general, fits the global geodynamic model of the supracrustal Archean complexes in the Baltic Shield.

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Section: Metallogenymentioning

confidence: 95%

Section: Island-arc Modelmentioning

confidence: 99%

Section: Island-arc Modelmentioning

confidence: 99%

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Lapland Granulite Belt–Neoarchean subduction zone in the North-Eastern Baltic shield

Kozlov

Martynov

Sorokhtin

2021

Applied Earth Science

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“…Наиболее молодые дайки долеритов могут быть отражением рифтогенной стадии развития восточной части Балтийского щита в рифейское или каледонское время. При петрогеохимических исследованиях архейских пород в настоящей работе был использован метод сопоставления и оценки степени «сходстваотличия» породных ассоциаций, представленных неоднородными совокупностями петрогеохимических параметров, разработанный ранее для моделирования изменчивости химического состава геологических образований в ходе эволюции Земли и поиска «гомологов» архейских образований Кольской сверхглубокой скважины [Козлов, Мартынов и др., 1999; 2002], а также метод аппроксимации отношения частичного порядка обобщенным показателем, функционально связанным с параметрами химического состава геологических объектов [Мартынов, 1997;Sorokhtin et al, 2020], специально адаптированные к решению поставленной задачи. Термин «гомолог» был предложен нами ранее [Козлов, 1995] для проведения параллелей между докембрийскими и фанерозойскими породными комплексами, генетически связанными с определенными режимами, с учетом специфичности докембрийского периода развития планеты, с одной стороны, и некоторой общности в характере реализации геодинамических обстановок на всем протяжении геологической истории, с другой, и был в то время сформулирован как положение о гомологичных рядах геодинамических режимах.…”

Section: глunclassified

The Rybachy and Sredny peninsulas (Baltic Shield) in the archaean and neoproterozoic: geology, geodynamics, oil and gas and diamond potential.

Sorokhtin¹,

Kozlov²,

Glaznev³

et al. 2022

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The monograph provides consolidated geological-geophysical data on the Neoproterozoic (Riphaean) sediments on the north-eastern Baltic Shield. The study pioneers in summarizing all previous and present-day materials on the geology of the Rybachy and Sredny Peninsulas obtained both in field research and by drilling of the Poranichnaya-1 (5202 m) and Rybachinskaya (3001 m) parametric boreholes, as well as a series of smaller (less than 1 km) prospecting boreholes. The study results indicate a high oil, gas and diamond potential of the regional lithological units that may host major accumulations of these minerals. This can be evidenced by a sustainable inflow of gas (methane) in one of boreholes and by fragments of diamond crystals found in the study area. Since issues of the oil and gas deposits generation and diamond-bearing magmatism are always tightly woven with uniform global patterns of the Earth’s evolution, the book outlines its history at early stages. The book is intended for multidiscipline geologists, engineers engaged in prospecting for oil, gas and diamonds, students and experts in the Earth’s evolution and spatial-temporal formation patterns of the mineral deposits.

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“…Litsa ore area as well as the northeastern Fennoscandian Shield is characterized by manifestation of the processes of Karelian tectonothermal protoactivation and Paleozoic tectonomagmatic activation [7,8]. Under the influence of these processes, metamorphogenic metasomatic ore-forming systems of different productivity appeared in metamorphic basement rocks.…”

mentioning

confidence: 99%

Litsa uranium ore occurrence (Arctic zone of the Fennoscandian Shield): new results of petrophysical and geochemical studies

Il’chenko

Afanasieva

Каулина

et al. 2022

PMI

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Mineralogical, petrophysical and geochemical studies have been carried out to determine the sequence and formation conditions of uranium mineralization within the Litsa ore occurrence (Kola Region). Mineralogical studies show the following formation sequence of ore minerals: uraninite – sulfides – uranophane, coffinite, pitchblende. Two stages of uranium mineralization are distinguished: Th-U (1.85-1.75 Ga) and U (400-300 Ma). The distribution of physical properties of rocks in the area is consistent with the presence of two temporal stages in the formation of mineralization with different distribution and form of uranium occurrence in rocks. The factors that reduce rock anisotropy are the processes of migmatization and hydrothermal ore mineralization, which heal pores and cracks. Fluid inclusions in quartz studied by microthermometry and Raman spectroscopy contain gas, gas-liquid and aqueous inclusions of different salinity (1.7-18.4 wt.% NaCl-eq.). According to homogenization temperatures of inclusions in liquid phase, the temperature of the Paleoproterozoic and Paleozoic stages of uranium mineralization at the Litsa ore occurrence is ~ 300 and 200 °С, respectively. Correlations of the spatial distribution of elastic anisotropy index with an elevated radioactive background allow using this petrophysical feature as one of the prognostic criteria for uranium and complex uranium mineralization when carrying out uranium predictive work.

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A Study in Earth's Geological Evolution

Cited by 9 publications

References 0 publications

Lapland Granulite Belt–Neoarchean subduction zone in the North-Eastern Baltic shield

Lapland Granulite Belt–Neoarchean subduction zone in the North-Eastern Baltic shield

The Rybachy and Sredny peninsulas (Baltic Shield) in the archaean and neoproterozoic: geology, geodynamics, oil and gas and diamond potential.

Litsa uranium ore occurrence (Arctic zone of the Fennoscandian Shield): new results of petrophysical and geochemical studies

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