3D model of deep structure of the Early Precambrian crust in the East European Craton and paleogeodynamic implications.
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| Title: | 3D model of deep structure of the Early Precambrian crust in the East European Craton and paleogeodynamic implications. |
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| Authors: | Mints, M.1 michael-mints@yandex.ru |
| Source: | Geotectonics. Jul2011, Vol. 45 Issue 4, p267-290. 24p. |
| Subject Terms: | *Precambrian stratigraphic geology, *Continental crust, *Cratons, *Structural geology |
| Geographic Terms: | Eastern Europe |
| Abstract: | The integral 3D model of the deep structure of the Early Precambrian crust in the East European Craton is based on interpretation of the 1-EU, 4B, and TATSEIS seismic CDP profiles in Russia and the adjacent territory of Finland (FIRE project). The geological interpretation of seismic images of the crust is carried out in combination with consideration of geological and geophysical data on the structure of the Fennoscandian Shield and the basement of the East European platform. The model displays tectonically delaminated crust with a predominance of low-angle boundaries between the main tectonic units and the complex structure of the crust-mantle interface, allowing correlation of the deep structure of the Archean Kola, Karelian, and Kursk granite-greenstone terrane with the Volgo-Uralia granulite-gneiss terrane, as well as the Paleoproterozoic intracontinental collision orogens (the Lapland-Mid-Russia-South Baltia orogen and the East Voronezh and Ryazan-Saratov orogens) with the Svecofennian accretionary orogen. The lower crustal 'layer' at the base of the Paleoproterozoic orogens and Archean cratons was formed in the Early Paleoproterozoic as a result of underplating and intraplating by mantle-plume mafic magmas and granulite-facies metamorphism. The increase in the thickness of this 'layer' was related to hummocking of the lower crustal sheets along with reverse and thrust faulting in the upper crust. The middle crust was distinguished by lower rigidity and affected by ductile deformation. The crust of the Svecofennian Orogen is composed of tectonic sheets plunging to the northeast and consisting of island-arc, backarc, and other types of rocks. These sheets are traced in seismic sections to the crust-mantle interface. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
| FullText | Links: – Type: pdflink Text: Availability: 0 |
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| Header | DbId: enr DbLabel: Energy & Power Source An: 63541261 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: 3D model of deep structure of the Early Precambrian crust in the East European Craton and paleogeodynamic implications. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Mints%2C+M%2E%22">Mints, M.</searchLink><relatesTo>1</relatesTo><i> michael-mints@yandex.ru</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Geotectonics%22">Geotectonics</searchLink>. Jul2011, Vol. 45 Issue 4, p267-290. 24p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Precambrian+stratigraphic+geology%22">Precambrian stratigraphic geology</searchLink><br />*<searchLink fieldCode="DE" term="%22Continental+crust%22">Continental crust</searchLink><br />*<searchLink fieldCode="DE" term="%22Cratons%22">Cratons</searchLink><br />*<searchLink fieldCode="DE" term="%22Structural+geology%22">Structural geology</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Eastern+Europe%22">Eastern Europe</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The integral 3D model of the deep structure of the Early Precambrian crust in the East European Craton is based on interpretation of the 1-EU, 4B, and TATSEIS seismic CDP profiles in Russia and the adjacent territory of Finland (FIRE project). The geological interpretation of seismic images of the crust is carried out in combination with consideration of geological and geophysical data on the structure of the Fennoscandian Shield and the basement of the East European platform. The model displays tectonically delaminated crust with a predominance of low-angle boundaries between the main tectonic units and the complex structure of the crust-mantle interface, allowing correlation of the deep structure of the Archean Kola, Karelian, and Kursk granite-greenstone terrane with the Volgo-Uralia granulite-gneiss terrane, as well as the Paleoproterozoic intracontinental collision orogens (the Lapland-Mid-Russia-South Baltia orogen and the East Voronezh and Ryazan-Saratov orogens) with the Svecofennian accretionary orogen. The lower crustal 'layer' at the base of the Paleoproterozoic orogens and Archean cratons was formed in the Early Paleoproterozoic as a result of underplating and intraplating by mantle-plume mafic magmas and granulite-facies metamorphism. The increase in the thickness of this 'layer' was related to hummocking of the lower crustal sheets along with reverse and thrust faulting in the upper crust. The middle crust was distinguished by lower rigidity and affected by ductile deformation. The crust of the Svecofennian Orogen is composed of tectonic sheets plunging to the northeast and consisting of island-arc, backarc, and other types of rocks. These sheets are traced in seismic sections to the crust-mantle interface. [ABSTRACT FROM AUTHOR] |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1134/S0016852111040054 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 24 StartPage: 267 Subjects: – SubjectFull: Precambrian stratigraphic geology Type: general – SubjectFull: Continental crust Type: general – SubjectFull: Cratons Type: general – SubjectFull: Structural geology Type: general – SubjectFull: Eastern Europe Type: general Titles: – TitleFull: 3D model of deep structure of the Early Precambrian crust in the East European Craton and paleogeodynamic implications. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Mints, M. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 07 Text: Jul2011 Type: published Y: 2011 Identifiers: – Type: issn-print Value: 00168521 Numbering: – Type: volume Value: 45 – Type: issue Value: 4 Titles: – TitleFull: Geotectonics Type: main |
| ResultId | 1 |
