Distribution, style, amount of collisional shortening, and their link to Barrovian metamorphism in the European Alps

Rosenberg, Claudio; Bellahsen, Nicolas; Rabaute, Alain; Girault, Jean-Baptiste

doi:10.1016/j.earscirev.2021.103774

Cited by 19 publications

(14 citation statements)

References 139 publications

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“…This value is close to an estimate of ∼40 km ductile north-south shortening in the Tauern Window that was accompanied by orogen-parallel stretching but negligible crustal thickening (Lammerer & Weger, 1998). As a result, our model provides low estimates of orogenic shortening in comparison to recent estimates (Rosenberg et al, 2021). Consequently, existing cross-sections cannot be regarded as "balanced" sensu strictu (Dahlstrom, 1969;Schönborn, 1999;Suppe, 1983Suppe, , 1985.…”

Section: Study Limitationssupporting

confidence: 75%

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Thermo‐Kinematic Evolution of the Eastern European Alps Along the TRANSALP Transect

et al. 2023

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Section: Study Limitationssupporting

confidence: 75%

“…(1998), 109–113 km, and Linzer et al. (2002), ∼95 km, but falls overall short relative to more recent estimates (e.g., 125 km when excluding 35 km of shortening along the Penninic Front; Rosenberg et al., 2021; 109–113 km of shortening north and >50 km south of the PF, respectively; Ustaszewski et al., 2008).…”

Section: Methodsmentioning

confidence: 71%

Thermo‐Kinematic Evolution of the Eastern European Alps Along the TRANSALP Transect

et al. 2023

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“…In the corresponding transect, Bucher et al (2004) estimated D3 backfolding to have occurred between 35 and 31 Ma, an estimate that most likely also applies to the Dora-Maira transect, since an along-strike change in the age of this event is hard to imagine. Exhumation and cooling below ~250 °C took place at around 30 Ma based on few on-site zircon fission-track ages available in the Dora-Maira UHP unit (Gebauer et al, 1997) and those from the Gran Paradiso massif (Hurford and Hunziker, 1989;Malusà et al, 2005;Rosenberg et al, 2021). Hence, 30 Ma would approximately date the crossing of the ductile-brittle transition, which would mark the end of the D3 phase.…”

Section: Timing Of the Tectono-metamorphic Evolutionmentioning

confidence: 99%

The Maira-Sampeyre and Val Grana Allochthons (south Western Alps): review and new data on the tectonometamorphic evolution of the Briançonnais distal margin

et al. 2022

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Here we describe the structure, the high-pressure, low-temperature (HP-LT) metamorphism and tectonic evolution of the Briançonnais distal margin units from the south Western Alps. The studied area extends southwest of the Dora-Maira (U)HP basement units and east-southeast of the classical Briançonnais nappes. A new structural map accompanied by geological profiles shows the thrusting of the oceanic nappes (Monviso and Queyras units) onto the distal Briançonnais units (D1 and D2 late Eocene deformation phases) under blueschist-facies conditions. Subsequent deformation during the Early Oligocene (D3 deformation phase) took place under greenschist-facies conditions and was associated with back-folding and -thrusting in the units overlying the Dora-Maira massif and with exhumation related to normal reactivation of former thrusts within the latter massif. Two large cover units, detached from their former distal Briançonnais basement, are redefined as the Maira-Sampeyre and Val Grana Allochthons (shortly: Maira-Grana Allochthons = MGA) including, (i) the Val Maira-Sampeyre unit involving Lower and Middle Triassic formations, seemingly detached from the Dora-Maira units during the subduction process, and (ii) the Val Grana unit with Middle-Upper Triassic and Early-Middle Jurassic formations, which was probably detached from the Maira-Sampeyre unit and correlates with the “Prepiemonte units” known from the Ligurian Alps to the Swiss Prealps. Three major shear zones involving tectonic mélanges of oceanic and continental rocks at the base of the Val Grana, Maira-Sampeyre and Dronero units testify to an early phase of exhumation within the subduction channel in front of the Adria plate. We present a new metamorphic map based on published and new petrological data, including new thermometric data obtained by Raman spectroscopy of carbonaceous material (RSCM). The TRSCM values range from ~ 400 °C to > 500 °C, going from the most external Val Grana unit and overlying Queyras schists to the uppermost Dora-Maira unit. During the Late Triassic, the width of the Briançonnais s.l. domain can be restored at ~ 100 km, whereas it reached ~ 150 km after the Jurassic rifting. A significant, second rifting event affected the Briançonnais domain during the Late Cretaceous-Paleocene, forming the Longet-Alpet chaotic breccias, which deserve further investigations.

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“…In the Lepontine dome of the Central Alps, Barrovian metamorphism is associated with a dome structure that comprises a pile of tectonic nappes, including the Adula, Maggia and Simano nappes (Figure 1), which are separated by major shear zones (e.g., Berger et al., 2005; Frey & Ferreiro Mählmann, 1999; Nagel, 2008; Rosenberg et al., 2021; Todd & Engi, 1997; Trommsdorff, 1974; Wenk & Keller, 1969; Figure 1). In the Lepontine area, the metamorphic isograds cross‐cut the tectonic nappe boundaries (e.g., Frey & Ferreiro Mählmann, 1999; Nagel, 2008; Todd & Engi, 1997; Trommsdorff, 1974; Wenk & Keller, 1969; Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Implications of New Geological Mapping and U‐Pb Zircon Dating for the Barrovian Tectono‐Metamorphic Evolution of the Lepontine Dome (Central European Alps)

Tagliaferri

Schenker

Ulianov

et al. 2023

Geochem Geophys Geosyst

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Distribution, style, amount of collisional shortening, and their link to Barrovian metamorphism in the European Alps

Cited by 19 publications

References 139 publications

Thermo‐Kinematic Evolution of the Eastern European Alps Along the TRANSALP Transect

Thermo‐Kinematic Evolution of the Eastern European Alps Along the TRANSALP Transect

The Maira-Sampeyre and Val Grana Allochthons (south Western Alps): review and new data on the tectonometamorphic evolution of the Briançonnais distal margin

Implications of New Geological Mapping and U‐Pb Zircon Dating for the Barrovian Tectono‐Metamorphic Evolution of the Lepontine Dome (Central European Alps)

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