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- Title
Depth-to-basement for the East European Craton and Teisseyre-Tornquist Zone in Poland based on potential field data.
- Authors
Mikołajczak, Mateusz; Mazur, Stanisław; Gągała, Łukasz
- Abstract
Results of a depth-to-basement study are presented for the East European Craton and the Teisseyre-Tornquist Zone (TTZ) in Poland. The terrestrial gravity data are inverted for the top of the Paleoproterozoic basement and, independently, for the top of the Ediacaran using seismic horizons from the PolandSPAN™ seismic survey and well tops as input depth measurements. The depth to the Ediacaran modelling was additionally extended to cover the Łysogóry Block and northern Małopolska Block. The results are visualised as isobath maps for the top of the Paleoproterozoic basement and top of the Ediacaran and an isopach map for the Ediacaran, supplemented with qualitative structural interpretation based on gravity and magnetic data. The results of modelling show a smooth crystalline basement slope within the TTZ with the top of the Paleoproterozoic basement uniformly descending south-westwards by 10–14 km. The thickness of the Ediacaran in SE Poland increases in the same direction to more than 10 km within the TTZ. Such a crustal architecture, in combination with the earlier documented Moho elevation of 4–6 km, reveals significant thinning of the Paleoproterozoic crust within the TTZ to form a crustal necking zone due to the Ediacaran rifting. A smooth geometry of the top of basement along with the lack of basement-rooted faults suggests a ductile mode of crustal thinning during rifting of Rodinia. Moreover, the development of the NW–SE-oriented rift, a precursor of the Tornquist Ocean, was associated with rifting in a NE–SW direction parallel to the Orsha-Volyn Rift.
- Subjects
POLAND; SEISMIC surveys; BATHYMETRY; GEOLOGIC faults; MOHOROVICIC discontinuity; BASEMENTS; RIFTS (Geology)
- Publication
International Journal of Earth Sciences, 2019, Vol 108, Issue 2, p547
- ISSN
1437-3254
- Publication type
Article
- DOI
10.1007/s00531-018-1668-9