A COMBINED MODEL OF THE DIAPIRIC AND COLLISIONAL FORMATION MECHANISM OF THE PALEOPROTEROZOIC GRANITE-MIGMATITE-GNEISS DOMES OF THE SVECOFENNIAN BELT-Reference-Cited by-同舟云学术

A COMBINED MODEL OF THE DIAPIRIC AND COLLISIONAL FORMATION MECHANISM OF THE PALEOPROTEROZOIC GRANITE-MIGMATITE-GNEISS DOMES OF THE SVECOFENNIAN BELT

Published:2023-08-17 Issue:4 Volume:14 Page:
ISSN:2078-502X
Container-title:Geodynamics & Tectonophysics
language:
Short-container-title:Geodin. tektonofiz.

Author:

Polyansky O. P.¹^ORCID,Baltybaev S. K.²^ORCID,Babichev A. V.¹^ORCID

Affiliation:

1. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences

2. Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences

Abstract

Geological examples of the development of thermal dome structures in the Svecofennian belt demonstrate the relationship between plutonic and metamorphic events and metamorphic strengthening towards the core parts of the structures. The corresponding 2D geological model has been created to make a quantitative assessment of the effect of mantle magmas temperature at the base of the crust and the formation of the diapiric cores surrounded by high-temperature areas with a degree of granulite facies metamorphism. Modeling shows that there is a possibility of melting of the lower crust in the presence of a water fluid under the influence of mantle magmas. After melting, there occurs an ascent of partially molten material towards the upper crustal levels. An absorbed aqueous fluid changes to hydrous melt, thus lowering its viscosity and density. The ascending height of high-temperature cores is determined by the depth of viscous-to-elastoplastic transition in the crustal matter rheology. These materials ascend to upper levels in a partially molten state in the process of overthrusting due to "collisional" tectonics.

Publisher

Institute of Earth's Crust, Siberian Branch of the Russian Academy of Sciences

Subject

Earth-Surface Processes,Geophysics,Geology,Economic Geology

Reference45 articles.

1. Andersson U.B., Larsson L., Wikström A., 1992. Charnockites, Pyroxene Granulites and Garnet-Cordierite Gneisses at a Boundary between Early Svecofennian Rocks and Småland-Värmland Granitoids, Karlskoga, Soutliem Sweden. Geologiska Föreningens i Stockholm Förhandlingar 114 (1), 1–15. https://doi.org/10.1080/11035899209453457.

2. Baltybaev Sh.K., Glebovitskii V.A., Kozyreva I.V., Konopelko D.L., Levchenkov O.A., Sedova I.S., Shuldiner V.I., 2000. Geology and Petrology of the Svecofennides of the Ladoga Region. Saint Petersburg University Publishing House, Saint Petersburg, 200 p. (in Russian)

3. Baltybaev Sh.K., Glebovitskii V.A., Kozyreva I.V., Shul’diner V.I., 1996. The Meyeri Thrust: The Main Element of the Suture at the Boundary between the Karelian Craton and the Svecofennian Belt in the Ladoga Region of the Baltic Shield. Doklady Earth Sciences 348 (4), 581–584.

4. Baltybaev Sh.K., Levchenkov O.A., Berezhnaya N.G., Levskii L.K., Makeev A.F., Yakovleva S.Z., 2004. Age and Duration of Svecofennian Plutono-Metamorphic Activity in the Ladoga Area, Southeastern Baltic Shield. Petrology 12 (4), 330–347.

5. Baltybaev Sh.K., Levchenkov O.A., Levskii L.K., 2009. Svecofennian Belt of the Fennoscandia: Spatiotemporal Correlation of the Early Proterozoic Endogenous Processes. Nauka, Saint Petersburg, 276 p. (in Russian)