Structure of the Middle Urals, east of the main Uralian Fault

Friberg, M.; Петров, Г. А.

doi:10.1002/(sici)1099-1034(199801/03)33:1<37::aid-gj758>3.0.co;2-5

Cited by 12 publications

(3 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Grevtsova et al, unpublished data), have considered these terranes to be micro-continents largely composed of Proterozoic and/or Archean crust. However, recent work, both further south in the orogen (Echtler et al 1997) and in the area considered here (Friberg et al 1997;Friberg and Petrov 1998), has questioned the age of the supposed ªPrecambrianº terranes in the hinterland areas.…”

Section: The East Uralian Zone Of the Middle Uralsmentioning

confidence: 99%

“…The Western Terrane is composed of the Emekh gneisses of probable oceanic crust, consisting predominantly of mafic to ultramafic gneisses of amphibolite-to granulite facies, locally with a greenschist-facies overprint. They are intruded by the Teliana granulite-to amphibolite-facies gabbro±diorite± granodiorite±plagiogranite suite (Keilman 1974;Petrov 1995;Friberg and Petrov 1998), which shows very little deformation, except near the shear zone.…”

Section: The East Uralian Zone Of the Middle Uralsmentioning

confidence: 99%

“…Within the Eastern terrane there are a few lenses of conodont-bearing marbles and paragneisses (Petrov and Borozdina 1996;Friberg and Petrov 1998), but their relationship to the Brodovo gneisses is not established. The gneisses are intruded by the Ermakov and East Emekh granites and the Basianovo gabbro (Sobolev et al 1964).…”

Section: The East Uralian Zone Of the Middle Uralsmentioning

confidence: 99%

See 2 more Smart Citations

Paleozoic amphibolite-granulite facies magmatic complexes in the hinterland of the Uralide Orogen

Friberg¹,

Ларионов²,

Петров

et al. 2000

International Journal of Earth Sciences

Self Cite

View full text Add to dashboard Cite

Within the hinterland of Urals, there occur a variety of high-grade complexes that have been interpreted to be fragments of continents that were accreted to Baltica during Paleozoic orogeny. Some workers have inferred the high-grade complexes to have rifted off Baltica during the Early Paleozoic; others claim that they were derived from elsewhere (perhaps Siberia) and are truly exotic terranes. In the Middle Urals, the amphibolite-to granulite-facies complexes of ªmicro-continentalº affinities are generally composed of mafic to intermediate gneisses, overlain by Paleozoic mØlange and island-arc volcanics. New Pb±Pb single zircon dating provides evidence only of a Paleozoic history for one of these high-grade units, the Salda Metamorphic Complex. Eight intrusion ages have been obtained from these granulite-facies gneisses and younger intrusions. The protoliths of the gneisses, the Teliana and the Brodovo intrusive suites, were formed at around 350 Ma (359 5, 357 7 and 343 9 Ma) and at 393 5 Ma, respectively. They are cut by the East Emekh granite (334 4 Ma) and the Basianovo gabbro (336 2 Ma). The new single zircon data fit well with previously conventional K±Ar, Pb±Pb and U±Pb ages by A.P. Grevtsova et al. (unpublished data). It is proposed here that the hinterland of the Middle Urals is dominated by Devonian to Middle Carboniferous subduction-related magmatic complexes that were emplaced prior to and during collisional orogeny in the Urals. The evidence presented here and age-data from other hinterland high-grade complexes casts doubt on the ªmicro-continentº interpretation.

show abstract

Section: The East Uralian Zone Of the Middle Uralsmentioning

confidence: 99%

Section: The East Uralian Zone Of the Middle Uralsmentioning

confidence: 99%

Section: The East Uralian Zone Of the Middle Uralsmentioning

confidence: 99%

See 1 more Smart Citation

Paleozoic amphibolite-granulite facies magmatic complexes in the hinterland of the Uralide Orogen

Friberg¹,

Ларионов²,

Петров

et al. 2000

International Journal of Earth Sciences

Self Cite

View full text Add to dashboard Cite

show abstract

An explicit plate kinematic model for the orogeny in the southern Uralides

Görz

Hielscher

2010

Tectonophysics

View full text Add to dashboard Cite

Integrated geological and geophysical studies in the SG4 borehole area, Tagil Volcanic Arc, Middle Urals: Location of seismic reflectors and source of the reflectivity

Ayarza¹,

Juhlin²,

Brown³

et al. 2000

J. Geophys. Res.

View full text Add to dashboard Cite

Abstract. Near-vertical incidence reflection seismic data acquired in the Tagil Volcanic Arc (Middle Urals) show the upper crust to be highly reflective. Two intersecting seismic lines located near the ongoing -5400 m deep SG4 borehole show that the main reflectivity strikes approximately N-S and dips -350-55 ø to the east. Prominent reflections intercept the borehole at -1000, -1500, 2800-2900, -3400, and between -4000 and 5400 m, which correspond to intervals of low velocity/low density/low resistivity. The surface projections of these reflections lie parallel to the strike of magnetic anomaly trends. Multioffset vertical seismic profile (VSP) data acquired in the SG4 borehole show a seismic response dominated by P to S reflected converted waves from the moderately east dipping reflectivity and from a set of very steep east dipping reflectors not imaged by the surface data. Modeling of the VSP data constrains the depth at which reflectors intercept the borehole and suggests that the P to S conversions are best explained by low-velocity porous intervals rather than higher-velocity mafic material. The most prominent east dipping reflection on the surface seismic data is only imaged on VSP shots that sample the crust closer to the E-W seismic line. This discrepancy between the VSP and the surface seismic data is attributed to rapid lateral changes in the physical properties of the reflector. Surface and borehole data suggest that the low-velocity/low-density/low-resistivity intervals are the most important source of reflectivity in the SG4 borehole area, although lithological contrasts may also play a role. Drill cores from the these zones contain hydrothermal alteration minerals indicating interaction with fluids. Tectonic criteria suggest that they might represent imbricated fracture zones often bounding different lithologies and/or intrusions. Some of them might also represent high-porosity lava flows or pyroclastic units, common in island arc environments.

show abstract

Structure of the Middle Urals, east of the main Uralian Fault

Cited by 12 publications

References 13 publications

Paleozoic amphibolite-granulite facies magmatic complexes in the hinterland of the Uralide Orogen

Paleozoic amphibolite-granulite facies magmatic complexes in the hinterland of the Uralide Orogen

An explicit plate kinematic model for the orogeny in the southern Uralides

Integrated geological and geophysical studies in the SG4 borehole area, Tagil Volcanic Arc, Middle Urals: Location of seismic reflectors and source of the reflectivity

Contact Info

Product

Resources

About