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The Krasnouralsky profile in the Middle Urals, Russia: a tomographic approach to vintage DSS data
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
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2009 (English)In: Tectonophysics, ISSN 0040-1951, E-ISSN 1879-3266, Vol. 472, no 1-4, 249-263 p.Article in journal (Refereed) Published
Abstract [en]

The Middle Urals region has been widely studied with geophysical methods over the past decades. An integrated program is in progress to summarize this knowledge, including modern reprocessing of controlled-source seismic data. This work is devoted to the Krasnouralsky DSS profile. We applied modern tomography inversion algorithms in 2D and 2.5D on first break traveltime picks from an archive catalogue. A number of initial models and various smoothing constraints were used to investigate the influence of starting models on the final model. Robustness and uncertainty of the recovered models were estimated with hypothesis testing and checkerboard tests. The recovered velocity structure shows a thicker crust below the contact of the West Uralian Zone and the Central Uralian Zone and below the Tagil–Magnitogorsk Zone. Deep high velocity anomalies on both sides of this zone are interpreted as crustal thinning or alteration of the crust by intrusions of mantle material. Our results suggest that it is worthwhile reinterpreting DSS traveltime data with modern inversion techniques.

Place, publisher, year, edition, pages
2009. Vol. 472, no 1-4, 249-263 p.
Keyword [en]
Tomography, P-waves, Crustal thickening, Middle Urals
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-97859DOI: 10.1016/j.tecto.2008.08.026ISI: 000268086800022OAI: oai:DiVA.org:uu-97859DiVA: diva2:172946
Available from: 2008-11-07 Created: 2008-11-07 Last updated: 2017-12-14Bibliographically 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
Opponent
Supervisors
Available from: 2008-11-07 Created: 2008-11-07 Last updated: 2016-05-13Bibliographically approved

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Kashubin, Artem S.Tryggvason, AriJuhlin, Christopher

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