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Study of the basement of the Russian European Platform based on a system of geotraverses and CMP profiles; 3D models of the early Precambrian crust in key regions

Michael V. Mints, Arsen K. Suleimanov, Nadezhda G. Zamozhniaya and Vladimir M. Stupak
Study of the basement of the Russian European Platform based on a system of geotraverses and CMP profiles; 3D models of the early Precambrian crust in key regions (in East European Craton; early Precambrian history and 3D models of deep crustal structure, Michael V. Mints (editor), Ksenia A. Dokukina (editor), Alexander N. Konilov (editor), Irina B. Philippova (editor), Valery L. Zlobin (editor), Pavel S. Babayants (editor), Elena A. Belousova (editor), Yury I. Blokh (editor), Maria M. Bogina (editor), William A. Bush (editor), Peter A. Dokukin (editor), Tatiana V. Kaulina (editor), Lev M. Natapov (editor), Valentina B. Piip (editor), Vladimir M. Stupak (editor), Arsen K. Suleimanov (editor), Alexey A. Trusov (editor), Konstantin V. Van (editor) and Nadezhda G. Zamozhniaya (editor))
Special Paper - Geological Society of America (March 2015) 510: 265-300

Abstract

The first broad Russian experiment aimed at the study of the deep structure of Earth's crust and upper mantle by the common midpoint (CMP) method along the 1-EU geotraverse and cross-traverse 4B was realized in 1995-2008 in the territory of the East European Platform under the Russian Federal Program on Development of the State Geotraverse Network and Deep and Superdeep Boreholes. At the same time, the EGGI profile, geotraverses TATSEIS, ESRU 2003-2005, and DOBRE in Ukraine, as well as the system of profiles under the FIRE project in the adjacent territory of Finland were acquired. Integration of the existing geological maps and available geological (in the widest sense: structural, geochemical, geochronological, and so forth) data with results of geological interpretation of seismic images of the crust and upper mantle have led to a three-dimensional (3D) model of the deep crustal structure of the East European craton and a significant revision of previous ideas on the deep structure and Early Precambrian evolution of the region. In the geological interpretation of seismic data, we attached particular significance to the direct tracing of geological boundaries and fault zones recognized on the seismic-reflection pattern and the section of effective acoustic impedance toward the present-day surface and to their correlation with mapped geological and tectonic units. Comparison of the seismic image geometry with the geology of the eastern Fennoscandian Shield at the present-day erosion level shows that the reflection pattern matches the general trends of compositional layering, gneissic banding, and schistosity. The roughly homogeneous structural domains of the crust correspond to relatively large tectonic sheets, 3-5 km thick. Their inner structure commonly is not discernible in reflection patterns. The 3D model of deep structure in the Kola-Lapland region is based on correlation of tectonostratigraphic complexes depicted in the geological-tectonic map with structural subdivisions recognized as a result of interpretation of seismic crust images and their tracing to depth. In addition to the geological section along the 1-EU geotraverse, the model includes the section along the FIRE-4-4a profile that crosses the western part of the region studied in Finland. The 3D model shows the Paleoproterozoic tectonic structures (Lapland granulite-gneiss belt and its structural and evolutionary relationships with lower-crustal granulites, the structure and tectonic position of the Tana belt) and Archean tectonic structural units (the Central Kola granulite-gneiss belt, the Inari-Kola granite-greenstone domain, and the boundary zone between the Kola craton and the Belomorian orogen). The detailed 3D model of the crust and uppermost mantle in the Karelian-Belomorian region is also based on correlation between the exposed geological structure and geological interpretation of seismic images along the 1-EU geotraverse and cross-traverse 4B. The geological interpretation of the seismic crust image along the FIRE-1 profile serves as the additional basis for the Svecofennian accretionary orogen and its boundary with the Kola-Karelia continent. The model of the crust in the Karelian-Belomorian region contains the Paleoproterozoic tectonic structures (East Karelian imbricate thrust belt, Svecofennian accretionary orogen, and Onega Depression) and also Archean tectonic structures (Kuhmo-Segozero and Kovdozero microcontinents, and Chupa granulite-gneiss belt). The deep structure of the platform basement beneath the Moscow syneclise is an immediate extension of the Fennoscandian Shield. The basement structure in this area was controlled by Paleoproterozoic processes resulting in formation of the Lapland-Mid-Russia-South Baltia intracontinental orogen. The 3D model shows the marginal Totma and Aprelevka volcanic-sedimentary belts, and a synformal structure for the upper crust in the central domain of the orogen. The rock complexes of the Zubtsov-Diakonovo granulite-gneiss belt in the northwest and the Dmitrov-Galich belt in the southeast make up a distinctly outlined stage in the synform section. These complexes are underlain by gneiss-migmatite-amphibolite associations of the Bologoevo and Ivanovo-Sharya belts and are overlain by similar rocks of the Tver and Bukalovo belts. Lastly, the Kashin synformal granulite-gneiss belt is localized in the upper part of the section. The alternation of rocks of differing metamorphic grade clearly indicates the tectonic or tectonized stratigraphic character of the section in the Nelidovo synform. The crust sandwiched between the southward-plunging Totma and Aprelevka belts is characterized by rough layering. The reflections and boundaries of crustal sheets outlined in agreement with this pattern plunge southward beneath the Archean Sarmatia and Volgo-Uralia continental blocks. The deep crustal structure of the Voronezh Crystalline Massif is determined by a succession of geodynamic settings and Archean and Paleoproterozoic tectonic events that resulted in the formation of the Archean crust in the Kursk granite-greenstone domain and probably in the Khopior microcontinent, the Middle Paleoproterozoic East Voronezh orogen, and the Late Paleoproterozoic North Voronezh orogen.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 510
Title: Study of the basement of the Russian European Platform based on a system of geotraverses and CMP profiles; 3D models of the early Precambrian crust in key regions
Title: East European Craton; early Precambrian history and 3D models of deep crustal structure
Author(s): Mints, Michael V.Suleimanov, Arsen K.Zamozhniaya, Nadezhda G.Stupak, Vladimir M.
Author(s): Mints, Michael V.editor
Author(s): Dokukina, Ksenia A.editor
Author(s): Konilov, Alexander N.editor
Author(s): Philippova, Irina B.editor
Author(s): Zlobin, Valery L.editor
Author(s): Babayants, Pavel S.editor
Author(s): Belousova, Elena A.editor
Author(s): Blokh, Yury I.editor
Author(s): Bogina, Maria M.editor
Author(s): Bush, William A.editor
Author(s): Dokukin, Peter A.editor
Author(s): Kaulina, Tatiana V.editor
Author(s): Natapov, Lev M.editor
Author(s): Piip, Valentina B.editor
Author(s): Stupak, Vladimir M.editor
Author(s): Suleimanov, Arsen K.editor
Author(s): Trusov, Alexey A.editor
Author(s): Van, Konstantin V.editor
Author(s): Zamozhniaya, Nadezhda G.editor
Affiliation: Russian Academy of Sciences, Geological Institute, Moscow, Russian Federation
Affiliation: Russian Academy of Sciences, Geological Institute, Moscow, Russian Federation
Pages: 265-300
Published: 20150331
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
Accession Number: 2015-044777
Categories: Structural geologyIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. block diags., 1 table, sect.
N59°45'00" - N70°00'00", E19°00'00" - E31°45'00"
N54°00'00" - N57°30'00", E35°00'00" - E40°00'00"
N52°30'00" - N84°00'00", E19°00'00" - E66°00'00"
Secondary Affiliation: Aerogeofizika, RUS, Russian FederationMacquarie University, AUS, AustraliaRussian Academy of Sciences, Institute of Ore Geology, Petrography, Mineralogy, and Geochemistry, RUS, Russian FederationPeoples' Friendship University of Russia, RUS, Russian FederationRussian Academy of Sciences, Kola Science Centre, RUS, Russian FederationLomonosov State University, RUS, Russian FederationSpetsgeofizika, RUS, Russian FederationRussian Academy of Sciences, Institute of Experimental Mineralogy, RUS, Russian FederationAll-Russian Scientific and Research Institute of Geophysical Exploration-Spetsgeofizika, RUS, Russian Federation
Source Note: Online First
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201521
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