The tectono-metamorphic evolution of gneiss complexes in the Middle Urals, Russia: a reappraisal

Echtler, Helmut; Иванов, К. С.; Ronkin, Yu. L.; Karsten, L.A.; Hetzel, Ralf; Noskov, A.G.

doi:10.1016/s0040-1951(97)00058-9

Cited by 55 publications

(30 citation statements)

References 24 publications

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“…New models supported both by theoretical (England and Holland 1979;Mancktelow 1995), tectono-metamorphic and geochronological data, have been developed in the last few decades to clarify the tectonic evolution of both ancient and recent orogenic belts. From the Alps (Ratschbacher et al 1991;Escher and Beaumont 1997) to the Peloritan Massif (Wallis et al 1993) and from the Hellenides (Xypolias and Koukouvelas 2001) to the Urals (Chemenda et al 1997;Echtler et al 1997) and Oman (Gray et al 2004;Searle et al 2004), the general concept of extrusion during crustal convergence has been well documented and commonly accepted.…”

Section: Introductionmentioning

confidence: 99%

Deformation during exhumation of medium‐ and high‐grade metamorphic rocks in the Variscan chain in northern Sardinia (Italy)

2008

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The Anglona and SW Gallura regions represent key places to investigate the tectonic evolution of medium- and high-grade metamorphic rocks cropping out in northern Sardinia (Italy). From south to north we distinguish two different metamorphic complexes recording similar deformation histories but different metamorphic evolution: the Medium Grade Metamorphic Complex (MGMC) and the High Grade Metamorphic Complex (HGMC). After the initial collisional stage (D1 deformation phase), both complexes were affected by three contractional deformational phases (D2, D3 and D4) followed by later extensional tectonics. The D2 deformation phase was the most significant event producing an important deformation partitioning that produced localized shearing and folding domains at the boundary between the two metamorphic complexes. We highlight the presence of two previously undocumented systems of shear belts with different kinematics but analogous orientation in the axial zone of Sardinia. They became active at the boundary between the MGMC and HGMC from the beginning of D2. They formed a transpressive regime responsible for the exhumation of the medium- and high-grade metamorphic rocks, and overall represent a change from orthogonal to orogen-parallel tectonic transport

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Section: Introductionmentioning

confidence: 99%

Deformation during exhumation of medium‐ and high‐grade metamorphic rocks in the Variscan chain in northern Sardinia (Italy)

2008

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“…Shearing in the AC at $300 Ma coincides with the main stage of Uralian crustal shortening in the Middle Urals (e.g. Puchkov 1997;Echtler et al 1997). Similar ages are found in the East Ufaley complex (305±6 and 296±6 Ma, white mica, Eide et al 1997).…”

Section: Carboniferous-triassicmentioning

confidence: 55%

“…This heterogeneous group of units comprises parts of the continental margin of the East European Craton, which have been-at least some of them-subducted eastwards beneath Devonian island arcs. Devonian high-pressure metamorphism is documented in the Maksyutov Complex (Southern Urals; Matte et al 1993;Dobretsov et al 1996;Hetzel et al 1998;Glodny et al 2002) and in the East-Ufaley Complex (Middle Urals; Hetzel and Romer 1999;Echtler et al 1997). Other occurrences are less overprinted by Uralian events but have recently come into the focus of interest because they preserve evidence for a Late Neoproterozoic orogeny (630-570 Ma, Puchkov 1997) along the eastern margin of the East European Craton.…”

Section: Introductionmentioning

confidence: 99%

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Proterozoic magmatic and tectonometamorphic evolution of the Taratash complex, Central Urals, Russia

Синдерн

Hetzel

Schulte

et al. 2005

Int J Earth Sci (Geol Rundsch)

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The Taratash Complex (TC) in the northernmost Bashkirian Anticlinorium (Middle Urals) is unique among the pre-Uralian polymetamorphic complexes along the eastern margin of the East European Craton because it experienced granulite facies peak metamorphic conditions (850-900°C/10 kbar). Herein, we constrain the post-granulite facies polystage evolution of the complex, which records various increments of the geodynamic history of the East European continental margin. Formation of granite and migmatite associated with amphibolite facies events are dated at 2,344±29 and 2,044±8 Ma (U-Pb, zircon) in different structural units. At 1,810±41 Ma, the TC was affected by a greenschist facies retrogressive metamorphism which was probably related to a stage of granite formation in the eastern part of the East European Craton. This is confirmed by a U-Pb-zircon age of 1,848±8 Ma obtained from a sheared granite in the adjacent Alexandrovskiy Complex (AC). Greenschist facies shear zones which separate different structural units of the TC formed before 1,350 Ma. Partial re-equilibration of RbSr-and K-Ar-isotope systems between 1,350 Ma and 1,200 Ma is attributed to fluid flow probably induced by anorogenic magmatism in the Bashkirian Anticlinorium. Meso-to Neoproterozoic basaltic dykes indicate that the TC had been exhumed to upper crustal levels at that time. Evidence for a Grenvillian event or for the Timanian orogeny which affected other pre-Uralian complexes in the Urals is lacking. Uralian orogenic shortening and thrusting on Devonian limestones is recorded by shear zones in the AC to the east of the TC and has been dated at 300 Ma (Rb-Sr, 40 Ar/ 39 Ar).

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“…Nevertheless, the occurrence of gabbroic rocks (known as tilaites) dated at 340 + 22 Ma (Pushkarev et al 2003) within the Kytlym massif, with a low 87 Sr/ 86 Sr initial ratio (,0.705), suggests that rocks of the UPB were still within an oceanic environment at that time. We thus consider model (2) more likely, and suggest that the UPB represents a long-lived island arc (and its associated marginal basin) that has been preserved from the sequential subduction -obduction cycles and particularly from the Late Silurian-Early Devonian westward obduction events, during which the MUF already acted as a major thrust (Matte 1995;Echtler et al 1997).…”

Section: Discussionmentioning

confidence: 99%

U-Pb Silurian age for a gabbro of the Platinum-bearing belt of the Middle Urals (Russia): evidence for beginning of closure of the Uralian Ocean

Bosch

Bruguier

Efimov

et al. 2006

Memoirs

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The tectono-metamorphic evolution of gneiss complexes in the Middle Urals, Russia: a reappraisal

Cited by 55 publications

References 24 publications

Deformation during exhumation of medium‐ and high‐grade metamorphic rocks in the Variscan chain in northern Sardinia (Italy)

Deformation during exhumation of medium‐ and high‐grade metamorphic rocks in the Variscan chain in northern Sardinia (Italy)

Proterozoic magmatic and tectonometamorphic evolution of the Taratash complex, Central Urals, Russia

U-Pb Silurian age for a gabbro of the Platinum-bearing belt of the Middle Urals (Russia): evidence for beginning of closure of the Uralian Ocean

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