Tectonic processes during collisional orogenesis from comparison of the Southern Uralides with the Central Variscides

Álvarez-Marrón, Joaquina

doi:10.1029/132gm06

Cited by 5 publications

(1 citation statement)

References 49 publications

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“…In recent years, the acquisition and integration of new geophysical and surface structural geology data have helped to define the crustal architecture of the Uralides, which in turn has provided significant data for use in the interpretation of the tectonic evolution of the orogen. To date, however, these integrated studies have focused largely on the crustal-scale structure of the orogen and on the architecture of the arc-continent collision zone [e.g., Juhlin et al, 1998;Friberg et al, 2002;Tryggvason et al, 2001;Brown et al, 1998Brown et al, , 2002Steer et al, 1998;Alvarez-Marron, 2002], with less emphasis on the structure of the foreland thrust and fold belt. In this paper, we investigate the structural architecture, timing of development, and the amount of shortening of the western Uralide foreland thrust and fold belt along three reflection seismic transects ( Figure 1).…”

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confidence: 99%

Structural architecture of the southern and middle Urals foreland from reflection seismic profiles

et al. 2006

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The Urals Seismic Experiment and Integrated Studies (URSEIS), Mikhailovsky, and Europrobe's Seismic Reflection Profiling in the Urals (ESRU) reflection seismic profiles provide constraints for the construction of balanced and restored geological cross sections across the southern and middle Urals foreland. The profiles image the transition from the undeformed foreland basin to the frontal structure of the foreland thrust and fold belt, the location of the basal detachment, and the location of the ramp down into the middle or lower crust. In the URSEIS and ESRU profiles, the transition into the undeformed foreland basin is imaged as an emergent west‐vergent thrust that deforms a westward thickening package of reflections related to synorogenic sediments, whereas in the Mikhailovsky profile, it is a buried system of imbricate thrusts. In all three data sets, the western flank of the foreland thrust and fold belt is imaged in the seismic data as an imbricate thrust system developed above a basal detachment located in either the upper part of the Neoproterozoic basement sediments or the lower part of the Paleozoic continental margin sediments. Truncation of reflections related to the undeformed sediments in the footwall to the imbricate thrust system mark the location of the ramp down of the basal detachment into the middle or lower crust beneath the basement‐cored anticlines along the eastern flank of the thrust belt. The URSEIS and ESRU profiles image the basement‐cored anticlines as predominantly east dipping reflections that extend into the middle and lower crust. Rocks in these anticlines record at least one phase of pre‐Uralide deformation and, at least in part, the reflectivity is due to this deformation event. Balanced and restored cross sections constructed along the three profiles indicate that the minimum shortening is about 20–25 km.

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Section: Introductionmentioning

confidence: 99%

Structural architecture of the southern and middle Urals foreland from reflection seismic profiles

et al. 2006

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Processes of Arc–Continent Collision in the Uralides

Brown

Herrington

Álvarez-Marrón

2011

Frontiers in Earth Sciences

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The structure of the south Urals foreland fold and thrust belt at the transition to the Precaspian Basin

Brown

Álvarez-Marrón

Pérez-Estaún

et al. 2004

JGS

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The structural architecture of the south Urals foreland fold and thrust belt at the transition into the Precaspian Basin is that of a wedge-shaped, west-vergent thrust stack with a significant amount of basement involvement. The surface geology of this part of the thrust belt is dominated by the south Urals accretionary complex, whose internal structure was primarily developed during Late Devonian to Early Carboniferous arc–continent collision and which was subsequently incorporated into the thrust belt. A number of thrusts, identified in the field and in seismic profiles, breach the accretionary complex, suggesting that they post-date its emplacement and may be related to the development of the foreland fold and thrust belt. A basal detachment can be confidently defined only beneath the frontal part of the thrust belt, making it difficult to construct balanced and restored cross-sections and therefore to calculate the amount of shortening. Nevertheless, the amount of shortening appears to be of the order of only a few tens of kilometres. There is a major change in the structural style along the frontal part of the thrust belt that may be related to basement topography and/or basement response to the deformation across a basement fault oriented at a high angle to the structural grain of the thrust belt.

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Tectonic processes during collisional orogenesis from comparison of the Southern Uralides with the Central Variscides

Cited by 5 publications

References 49 publications

Structural architecture of the southern and middle Urals foreland from reflection seismic profiles

Structural architecture of the southern and middle Urals foreland from reflection seismic profiles

Processes of Arc–Continent Collision in the Uralides

The structure of the south Urals foreland fold and thrust belt at the transition to the Precaspian Basin

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