Plate tectonic model of the South Urals development

Zonenshain, Lev P.; Korinevsky, V. G.; Kazmin, V. G.; Pechersky, D. M.; Khain, V. V.; Matveenkov, Vladimir

doi:10.1016/0040-1951(84)90173-2

Cited by 186 publications

(88 citation statements)

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“…Formation of the Uralides began with rifting and development of a passive continental margin on the East European platform in Late Cambrian to early Ordovi cian time [Hamilton, 1970;Zonenshain et al, 1984]. The subsequent tectonic evolution of the Uralides involved amalgamation of various lithospheric elements during the Permian or early Triassic time, with formation of island arcs, back-arc basins, and oceanic crust by succes sive convergence of the East European platform, Siberian Knapp et aI., 1996).…”

Section: Geologic Frameworkmentioning

confidence: 99%

Role of a phase: Change Moho in stabilization and preservation of the Southern Uralide orogen, Russia

Diaconescu

Knapp

2002

Mountain Building in the Uralides: Pangea to the Present

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Section: Geologic Frameworkmentioning

confidence: 99%

Role of a phase: Change Moho in stabilization and preservation of the Southern Uralide orogen, Russia

Diaconescu

Knapp

2002

Mountain Building in the Uralides: Pangea to the Present

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“…The Uralian crustal structures are thought to have developed from collisional accretion of volcanic arc and microcontinental fragments with the former east European continental margin [Hamilton, 1970,' Zonenshain et al, 1984, 1990 …”

Section: Geologic and Geophysical Frameworkmentioning

confidence: 99%

Seismic wide‐angle constraints on the crust of the southern Urals

Carbonell¹,

Muset²,

Pérez-Estaún³

et al. 2000

J. Geophys. Res.

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Abstract. A wide-angle seismic reflection/refraction data set was acquired during spring 1995 across the southern Urals to characterize the lithosphere beneath this Paleozoic orogen. The wide-angle reflectivity features a strong frequency dependence. While the lower crustal reflectivity is in the range of 6-15 Hz, the PmP is characterized by frequencies below 6 Hz. After detailed frequency filtering, the seismic phases constrain a new average P wave velocity crustal model that consists of an upper layer of 5.0-6.0 km/s, which correlates with the surface geology; 5-7 km depths at which the velocities increase to 6.2-6.3 km/s; 10-30 km depths at which, on average, the crust is characterized by velocities of 6.6 km/s; and finally, the lower crust, from 30-35 km down to the Moho, which has velocities ranging from 6.8 to 7.4 km/s. Two different S wave velocity models, one for the N-S and one for the E-W, were derived from the analysis of the horizontal component recordings. Crustal sections of Poisson's ratio and anisotropy were calculated from the velocity models. ThePoisson's ratio increases in the lower crust at both sides of the root zone. A localized 2-3% anisotropy zone is imaged within the lower crust beneath the terranes east of the root. This feature is supported by time differences in the SmS phase and by the particle motion diagrams, which reveal two polarized directions of motion. Velocities are higher in the central part of the orogen than for the Siberian and eastern plates. These seismic recordings support a 50-56 km crustal thickness beneath the central part of the orogen in contrast to Moho depths of m45 km documented at the edges of the transect. The lateral variation of the PmP phase in frequency content and in waveform can be taken as evidence of different genetic origins of the Moho in the southern Urals.

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“…Existing models for the Palaeozoic tectonic development of the Uralides involve break-up of the EEC margin and initiation of the opening of the Uralian Ocean during Ordovician times, at c. 480-500 Ma (Zonenshain et al 1984;Fershtater et al 1997). The subsequent evolution of this oceanic domain is characterized by the building of several volcanic island arcs within or peripheral to the Uralian Ocean.…”

Section: Discussionmentioning

confidence: 99%

“…In Early Silurian times, anticlockwise rotation of Baltica (Torsvik et al 1996;Torsvik & Rehnstrom 2001;Roberts 2003) may have been accommodated by subduction of the Uralian oceanic domain and development of an island arc. The Mid-Silurian UPB could have formed in such a geodynamic setting, contemporaneously with the Sakmara arc of the Southern Urals (Zonenshain et al 1984). The 425 Ma U-Pb zircon age of the Kumba massif would thus represent a minimum age for early contraction processes and for onset of the closure of the Uralian oceanic domain.…”

Section: Discussionmentioning

confidence: 99%