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

Diaconescu, Camelia; Knapp, J. H.

doi:10.1029/132gm05

Cited by 6 publications

(2 citation statements)

References 71 publications

(88 reference statements)

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“…This is consistent with both recently proposed models based on interpretation of seismic refraction data (Stadtlander et al 1999) and older models based on gravity data and topography (Kruse & McNutt 1988). However, this model contrasts sharply with those suggesting that East European crust extends far to the east below the Magnitogorsk-Tagil arcs (Berzin et al 1996;Poupinet et al 1997;Knapp et al 1998;Drring & G6tze 1999;Diaconescu & Knapp 2002).…”

Section: Strike-slip Fault Systemscontrasting

confidence: 73%

Crustal structure of the Middle Urals based on seismic reflection data

Kashubin

Juhlin

Friberg

et al. 2006

Memoirs

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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).

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Section: Strike-slip Fault Systemscontrasting

confidence: 73%

Crustal structure of the Middle Urals based on seismic reflection data

Kashubin

Juhlin

Friberg

et al. 2006

Memoirs

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“…[99] Preserved eclogitic crustal roots were detected also beneath the southern Urals [Echtler et al, 1996;Carbonell Diaconescu and Knapp, 2002]; and beneath the trans-Hudson orogen [Baird et al, 1995]. It is still debatable, however, why dense eclogitic roots are not recycled yet into the mantle.…”

Section: Implication For the Evolution Of The Lapland-kola Orogenmentioning

confidence: 99%

Evidence for preservation of crustal root beneath the Proterozoic Lapland‐Kola orogen (northern Fennoscandian shield) derived from P and S wave velocity models of POLAR and HUKKA wide‐angle reflection and refraction profiles and FIRE4 reflection transect

et al. 2009

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[1] We present an analysis of the crust and upper mantle in the northern Fennoscandian shield, based on new P and S wave 2-D velocity models of the POLAR and HUKKA wide-angle reflection and refraction profiles and results of a new seismic reflection experiment in Finland (Finnish Reflection Experiment). The profiles are almost collocated and crossed the Proterozoic Lapland-Kola orogen. A substantial difference of the depth of ''the wide-angle Moho'' (40-42 km) and ''the reflection Moho'' (47-50 km) was found. In order to explain this difference, we compared the velocity models to published values of Vp and Vp/Vs for the main types of lower crustal and mantle rocks. We found that the main reason for disagreement is that the wide-angle Moho and the reflection Moho correspond to different petrological boundaries. In the southwest and northeast portions of the profiles, the wide-angle Moho marks contact of either anorthositic or granulitic lower crust with a reflective layer in the upper mantle composed of peridotites and pyroxenites. The reflection Moho represents the bottom of this lower layer. In the center of the profile the wide-angle Moho marks the top of a large eclogitic body in the upper mantle, representing a well-preserved crustal root beneath the Lapland-Kola orogen formed because of the collision of three former Archaean crustal blocks (terranes or microcontinents). Lack of postorogenic tectonic collapse suggests another mechanism for stabilization of the lithosphere in the area. Upper mantle reflectors at depth of 65-75 km may mark the upper boundary of the cold and mechanically strong Archaean upper mantle wedge. Alternatively, these reflectors may represent a top of uplifted asthenosphere that can explain preservation of crustal root.Citation: Janik, T., E. Kozlovskaya, P. Heikkinen, J. Yliniemi, and H. Silvennoinen (2009), Evidence for preservation of crustal root beneath the Proterozoic Lapland-Kola orogen (northern Fennoscandian shield) derived from P and S wave velocity models of POLAR and HUKKA wide-angle reflection and refraction profiles and FIRE4 reflection transect,

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The Ufa indenter: stratigraphic and geophysic evidences for an actual indentation of the Southern Urals by the East European craton

Lefort

Danukalova

2013

Int J Earth Sci (Geol Rundsch)

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

Cited by 6 publications

References 71 publications

Crustal structure of the Middle Urals based on seismic reflection data

Crustal structure of the Middle Urals based on seismic reflection data

Evidence for preservation of crustal root beneath the Proterozoic Lapland‐Kola orogen (northern Fennoscandian shield) derived from P and S wave velocity models of POLAR and HUKKA wide‐angle reflection and refraction profiles and FIRE4 reflection transect

The Ufa indenter: stratigraphic and geophysic evidences for an actual indentation of the Southern Urals by the East European craton

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