KFU. Card publication. Crustal structure of the Volgo–Uralian subcraton revealed by inverse and forward gravity modelling

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FEDERAL UNIVERSITY

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CRUSTAL STRUCTURE OF THE VOLGO&NDASH;URALIAN SUBCRATON REVEALED BY INVERSE AND FORWARD GRAVITY MODELLING

Form of presentation

Articles in international journals and collections

Year of publication

2022

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Authors, employees of KFU

Ognev Igor Nikolaevich, author

Other authors

Ebbing Jörg , author

Haas Peter , author

Bibliographic description in the original language

Ognev I., Ebbing J., Haas P. Crustal structure of the Volgo–Uralian subcraton revealed by inverse and forward gravity modelling // Solid Earth. 2022. � 2 (13). p. 431–448.

Annotation

Solid Earth

Keywords

The name of the journal

Solid Earth

On-line resource for training course

http://dspace.kpfu.ru/xmlui/bitstream/handle/net/170822/F_2___Crustal_structure_of_the_Volgo_Uralian_subcraton__2022_.pdf?sequence=1&isAllowed=y

URL

https://se.copernicus.org/articles/13/431/2022/se-13-431-2022.html

Please use this ID to quote from or refer to the card

https://repository.kpfu.ru/eng/?p_id=263762&p_lang=2

Resource files

File name	Size (MB)	Format
F_2___Crustal_structure_of_the_Volgo_Uralian_subcraton__2022_.pdf	14,12	pdf	show / download

Full metadata record

Field DC	Value	Language
dc.contributor.author	Ognev Igor Nikolaevich	ru_RU
dc.contributor.author	Ebbing Jörg	ru_RU
dc.contributor.author	Haas Peter	ru_RU
dc.date.accessioned	2022-01-01T00:00:00Z	ru_RU
dc.date.available	2022-01-01T00:00:00Z	ru_RU
dc.date.issued	2022	ru_RU
dc.identifier.citation	Ognev I., Ebbing J., Haas P. Crustal structure of the Volgo–Uralian subcraton revealed by inverse and forward gravity modelling // Solid Earth. 2022. � 2 (13). p. 431–448.	ru_RU
dc.identifier.uri	https://repository.kpfu.ru/eng/?p_id=263762&p_lang=2	ru_RU
dc.description.abstract	Solid Earth	ru_RU
dc.description.abstract	Volgo–Uralia is a Neoarchaean easternmost part of the East European craton. Recent seismic studies of the Volgo–Uralian region provided new insights into the crustal structure of this area. In this study, we combine satellite gravity and seismic data in a common workflow to perform a complex study of Volgo–Uralian crustal structure, which is useful for further basin analysis of the area. In this light, a new crustal model of the Volgo–Uralian subcraton is presented from a step-wise approach: (1) inverse gravity modelling followed by (2) 3D forward gravity modelling. First, inversion of the satellite gravity gradient data was applied to determine the Moho depth for the area. Density contrasts between crust and mantle were varied laterally according to the tectonic units present in the region, and the model is constrained by the available active seismic data. The Moho discontinuity obtained from the gravity inversion was consequently modified and complemented in order to define a complete 3D crustal model by adding information on the sedimentary cover, upper crust, lower crust, and lithospheric mantle layers in the process of forward gravity modelling, where both seismic and gravity constraints were respected. The obtained model shows crustal thickness variations from 32 to more than 55 km in certain areas. The thinnest crust with a thickness below 40 km is found beneath the Precaspian basin, which is covered by a thick sedimentary layer. The thickest crust is located underneath the Ural Mountains as well as in the centre of the Volgo–Uralian subcraton. In both areas the crustal thickness exceeds 50 km. At the same time, initial forward gravity modelling has shown a gravity misfit of ca. 95 mGal between the measured Bouguer gravity anomaly and the forward calculated gravity field in the central area of the Volgo–Uralian subcraton. This misfit was interpreted and modelled as a high-density lower crust, which possibly represents underplated material. Our preferred crustal model of the Volgo–Uralian subcraton respects the gravity and seismic constraints and reflects the main geological features of the region with Moho thickening in the cratons and under the Ural Mountains and thinning along the Palaeoproterozoic rifts, Precaspian sedimentary basin, and Pre-Urals foredeep.	ru_RU
dc.language.iso	ru	ru_RU
dc.subject		ru_RU
dc.title	Crustal structure of the Volgo–Uralian subcraton revealed by inverse and forward gravity modelling	ru_RU
dc.type	Articles in international journals and collections	ru_RU