Paleoproterozoic (2.51–2.40 Ga) Igneous Provinces of the Northeastern Fennoscandia: Geochemistry of Volcanic Rocks and Correlation with Intrusive Complexes

The results of geochemical studies of Paleoproterozoic volcanic rocks in the structure of the Polmak–Pechenga–Imandra–Varzuga belt of the northeastern part of the Fennoscandian Shield are presented. Taking into account new geochronological data, the volcanic series are correlated with subvolcanic an...

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Published inStratigraphy and geological correlation Vol. 28; no. 6; pp. 603 - 629
Main Authors Arzamastsev, A. A., Egorova, S. V., Erofeeva, K. G., Samsonov, A. V., Stepanova, A. V., Skuf’in, P. K., Chashchin, V. V., Veselovskiy, R. V.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.11.2020
Springer Nature B.V
Subjects
Archaeology
Belts
Comparative analysis
Contamination
Earth and Environmental Science
Earth Sciences
Evolution
Geochemistry
Geochronology
Geophysics/Geodesy
Historical Geology
Magma
Rocks
Sedimentology
Structural Geology
Volcanic rocks
Fennoscandia
Pechenga structure
dikes
Kola Peninsula
Proterozoic
Imandra–Varzuga structure
Precambrian
intrusions
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Summary:The results of geochemical studies of Paleoproterozoic volcanic rocks in the structure of the Polmak–Pechenga–Imandra–Varzuga belt of the northeastern part of the Fennoscandian Shield are presented. Taking into account new geochronological data, the volcanic series are correlated with subvolcanic and intrusive rocks of the Murmansk and Kola–Norwegian terranes. The comparative analysis of sections of volcanic rocks of the Imandra–Varzuga and Pechenga structures indicate asynchronous evolution of these fragments of the belt in a range of 2.51–2.40 Ga and a significant time gap (probably, >300 m.y.) in evolution of both the Imandra–Varzuga and Pechenga structures. The geochemical evidence is provided for the cyclic plume-lithospheric interaction during magmatism of the Sumian–Sariolian period, which shows that basic melts mostly generated from facies of spinel lherzolites exhibit features of significant crustal contamination as a result of their interaction with rocks of the Archean basement.
ISSN:0869-5938
1555-6263
DOI:10.1134/S0869593820060039