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Crustal structure of the Middle Urals based on seismic reflection data
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
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2006 (English)In: European Lithosphere Dynamics / [ed] D.G. Gee and R.A. Stephenson, London: Geological Society , 2006, 427-442 p.Chapter in book (Other academic)
Abstract [en]

EUROPROBE-related seismic reflection surveys in the Middle Urals, Russia (latitude 56-62°) since 1993 have led to an increased understanding of the crustal structure and tectonic evolution of this region. A 400 km long profile now extends from the foreland basin in the west well into the West Siberian Basin in the east. Bivergent structures characterize the upper crust of the Uralide orogen, whereas the middle and lower crust generally contain gently west-dipping reflections. A crustal root is imaged down to almost 60 km beneath the exposed Urals. Below the foreland and the West Siberian Basin the lower crustal reflectivity is pronounced and the Moho lies at a depth of 40-45 km. Below the foreland on the recently acquired Serebrianka-Beriozovka profile, two sets of late arriving (20-25 s) reflections are present. One set reflects from a zone in the mantle at about 60-70 km depth that strikes ENE and dips about 45° to the SSE. The other set may represent imbricated lower crust. Major events during the Palaeozoic tectonic evolution of the Middle Urals were: continental and oceanic rifting (Late Cambrian to Early Ordovician); development of a passive continental margin (Mid-Ordovician to Mid-Carboniferous); intra-oceanic subduction below the Tagil arc (Silurian to Devonian); east-dipping subduction of the Baltica plate (Silurian to Early Devonian); possible subduction reversal with formation of the Alapaevsk island arc and the Krasnoturjinsk-Petrokamensk active continental margin (Devonian to Early Carboniferous); active building of a mountain belt and intrusion of collision-related granitic plutons (Carboniferous to Permian).

Place, publisher, year, edition, pages
London: Geological Society , 2006. 427-442 p.
Series
Memoirs / Geological society of London, ISSN 0435-4052 ; 32
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-97858DOI: 10.1144/GSL.MEM.2006.032.01.26ISBN: 1-86239-212-9 (print)OAI: oai:DiVA.org:uu-97858DiVA: diva2:172945
Available from: 2008-11-07 Created: 2008-11-07 Last updated: 2017-01-25Bibliographically approved
In thesis
1. Seismic Studies of Paleozoic Orogens in SW Iberia and the Middle Urals
Open this publication in new window or tab >>Seismic Studies of Paleozoic Orogens in SW Iberia and the Middle Urals
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Controlled source seismic methods were employed in this study to investigate the reflectivity and velocity structure of two Hercynian orogens – the Uralides and Variscides. Conventional common depth point (CDP) sections from five reflection seismic campaigns and a velocity model obtained from tomographic inversion of wide-angle observations were the main datasets studied from the Middle Urals. These were complemented with the near-vertical seismic sections and velocity models from the Southern Urals. In the Variscides, conventional CDP processing, along with non-standard processing and synthetic data modeling, were used to obtain and interpret reflection seismic images of the Southwestern Iberian crust.

Although, the Uralian and Variscan belts were formed in Late Paleozoic time in apparently similar plate collisional settings, a comparison of the seismic results show that the crust of these two orogens looks quite different at depth. In the Urals, collision of Baltica with Asian terranes (Siberia and Kazakhstan) resulted in a highly diversely reflective crust of 40-45 km thickness. The axial zone of the orogen is characterized by a high velocity crustal root of diffuse reflectivity and an imbricated Moho, with a crustal thickness reaching 55-60 km. The Moho discontinuity is marked by a sharp decrease in reflectivity and is well imaged in most locations except in the crustal root zone. The Southwestern Iberian Variscan crust is 30-35 km thick and is characterized by a highly reflective two-layered structure that resulted from collision of Luarussia and Gondwana, including terranes in-between them. This type of crustal structure is very similar to those imaged in other regions of the Variscan belt in the Europe. The Moho discontinuity is flat and appears to be the deepest reflection. This thesis compares the deep structure of the two orogens and interprets mountain building processes related to late Paleozoic plate movements.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2008. 79 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 581
Keyword
Reflection seismics, Traveltime tomography, Uralian orogeny, Variscan orogeny, Crustal structure
National Category
Geophysics
Identifiers
urn:nbn:se:uu:diva-9405 (URN)978-91-554-7358-7 (ISBN)
Public defence
2008-11-28, Axel Hambergsalen, Geocentrum, Villavägen 16, 752 36 Uppsala, 10:00
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Available from: 2008-11-07 Created: 2008-11-07 Last updated: 2016-05-13Bibliographically approved

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Juhlin, ChristopherKashubin, Artem

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