Precollisional development and Cenozoic evolution of the Southalpine retrobelt (European Alps)

Zanchetta, Stefano; Malusà, Marco G.; Zanchi, Andréa

doi:10.1130/l466.1

Cited by 31 publications

(58 citation statements)

References 72 publications

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“…The uplift of the entire Adamello complex likely occurred due to it acting as a rigid block, whereas elsewhere in the Southern Alps an inherited network of Mesozoic faults allowed for strain partitioning and localization of deformation. A similar Tortonian pulse of exhumation has also been reported for the northern sectors of the central Southern Alps based on AFT data (Zanchetta et al 2015).…”

Section: Late-stage Exhumation In the Southern Alpssupporting

confidence: 82%

“…Throughout most of the Southern Alps exhumation of deep crustal material did not occur and erosion of less than 10 km is evident from the Mesozoic ZFT ages and the Mesozoic-to-Eocene AFT ages recorded in the Orobic Alps (Bertotti et al 1999;Zanchetta et al 2011Zanchetta et al , 2015, the Giudicarie region (Zattin et al 2006) and the Dolomites (Emmerich et al 2005). Shortening during Alpine orogeny led to significant exhumation mainly in localized areas in and around the Giudicarie belt.…”

Section: Late-stage Exhumation In the Southern Alpsmentioning

confidence: 99%

“…Exhumation continued until the Late Miocene leading to the formation of large-amplitude folds and domes in the Tauern Window (e.g., Schmid et al 2013). South of the PAF system, limited exhumation from shallow crustal levels (Zanchetta et al 2015;Zattin et al 2006) occurred, and throughout the Oligo-Miocene most deformation was accommodated by progressive southward thrust propagation and transpressional shear along the indenter margin (Picotti et al 1995;Pomella and Stipp 2012;Prosser 1998;Viola et al 2001). West of the Giudicarie fault, thermochronological data from the Adamello complex, the largest Tertiary intrusion of the Alps, record rapid uplift and exhumation from a shallow depth (~2 km) between 8 and 6 Ma (Reverman et al 2012) (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Postcollisional cooling history of the Eastern and Southern Alps and its linkage to Adria indentation

Heberer

Reverman

Fellin

et al. 2016

Int J Earth Sci (Geol Rundsch)

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Apatite (U-Th-Sm)/He ages from the Karawanken Mountains range between 12 and 5 Ma and indicate an episode of fault-related exhumation leading to the formation of a positive flower structure and an associated peripheral foreland basin. In the Southern Alps, apatite (U-Th-Sm)/He and fission-track data combined with previous data also indicate a pulse of mainly Late Miocene exhumation, which was maximized along thrust systems, with highly differential amounts of displacement along individual structures. Our data contribute to mounting evidence for widespread Late Miocene tectonic activity, which followed a phase of major exhumation during strain localization in the Tauern Window. We attribute this exhumational phase and more distributed deformation during Adriatic indentation to a major change in boundary conditions operating on the orogen, likely due to a shift from a decoupled to a coupled system, possibly enhanced by a shift in convergence direction.

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Section: Late-stage Exhumation In the Southern Alpssupporting

confidence: 82%

Section: Late-stage Exhumation In the Southern Alpsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Postcollisional cooling history of the Eastern and Southern Alps and its linkage to Adria indentation

Heberer

Reverman

Fellin

et al. 2016

Int J Earth Sci (Geol Rundsch)

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“…The Giudicarie Line represents a major Mesozoic paleogeographic boundary within the Adriatic Plate, inherited from Tethyan opening in the Jurassic, and separating during the whole Mesozoic the Lombardian basin (to the west) from the Trento high (to the east) [Winterer and Bosellini, 1981]. Moreover, the structural style in the South Alpine domain changes dramatically across the Giudicarie Line, from thick skinned to the west [Zanchetta et al, 2015] to thin skinned to the east [Doglioni and Bosellini, 1987], and this could be consistent with a retroside position of the South Alpine units to the west of the Giudicarie Line, compared to a proside position to the east. We propose that the Giudicarie Line may represent an inherited Mesozoic structure cutting across the Adriatic Tethyan margin, later reactivated as a tear fault [e.g., Prosser, 2000].…”

Section: Along-strike Slab Continuity and The Role Of Inherited Strucmentioning

confidence: 99%

Continuity of the Alpine slab unraveled by high‐resolution P wave tomography

et al. 2016

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The question of lateral and/or vertical continuity of subducted slabs in active orogens is a hot topic partly due to poorly resolved tomographic data. The complex slab structure beneath the Alpine region is only partly resolved by available geophysical data, leaving many geological and geodynamical issues widely open. Based upon a finite‐frequency kernel method, we present a new high‐resolution tomography model using P wave data from 527 broadband seismic stations, both from permanent networks and temporary experiments. This model provides an improved image of the slab structure in the Alpine region and fundamental pinpoints for the analysis of Cenozoic magmatism, (U)HP metamorphism, and Alpine topography. Our results document the lateral continuity of the European slab from the Western Alps to the central Alps, and the downdip slab continuity beneath the central Alps, ruling out the hypothesis of slab break off to explain Cenozoic Alpine magmatism. A low‐velocity anomaly is observed in the upper mantle beneath the core of the Western Alps, pointing to dynamic topography effects. A NE dipping Adriatic slab, consistent with Dinaric subduction, is possibly observed beneath the Eastern Alps, whereas the laterally continuous Adriatic slab of the Northern Apennines shows major gaps at the boundary with the Southern Apennines and becomes near vertical in the Alps‐Apennines transition zone. Tear faults accommodating opposite‐dipping subductions during Alpine convergence may represent reactivated lithospheric faults inherited from Tethyan extension. Our results suggest that the interpretations of previous tomography results that include successive slab break offs along the Alpine‐Zagros‐Himalaya orogenic belt might be proficiently reconsidered.

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“…The Southern Alps are an E‐W‐trending, south‐vergent thrust belt, formed by Late Cretaceous to Neogene thrusting of the retrowedge of the Alps (see Zanchetta et al, , for a review). The northern border is the Insubric Fault and the southern border the Po Basin (Figure ).…”

Section: Introductionmentioning

confidence: 99%

Kinematics and Age of Syn‐Intrusive Detachment Faulting in the Southern Alps: Evidence for Early Permian Crustal Extension and Implications for the Pangea A Versus B Controversy

Pohl

Froitzheim²,

Obermüller³

et al. 2018

Tectonics

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Permian basin formation and magmatism in the Southern Alps of Italy have been interpreted as expressions of a WSW-ENE-trending, dextral megashear zone transforming Early Permian Pangea B into Late Permian Pangea A between~285 and 265 Ma. In an alternative model, basin formation and magmatism resulted from N-S crustal extension. To characterize Permian tectonics, we studied the Grassi Detachment Fault, a low-angle extensional fault in the central Southern Alps. The footwall forms a metamorphic core complex affected by upward-increasing, top-to-the-southeast mylonitization. Two granitoid intrusions occur in the core complex, the synmylonitic Val Biandino Quartz Diorite and the postmylonitic Valle San Biagio Granite. U-Pb zircon dating yielded crystallization ages of 289.1 ± 4.5 Ma for the former and 286.8 ± 4.9 Ma for the latter. Consequently, detachment-related mylonitic shearing took place during the Early Permian and ended at~288 Ma, but kinematically coherent brittle faulting continued. Considering 30°anticlockwise rotation of the Southern Alps since Early Permian, the extension direction of the Grassi Detachment Fault was originally~N-S. Even though a dextral continental wrench system has long been regarded as a viable model at regional scale, the local kinematic evidence is inconsistent with this and, rather, supports N-S extensional tectonics. Based on a compilation of >200 U-Pb zircon ages, we discuss the evolution and tectonic framework of Late Carboniferous to Permian magmatism in the Alps.

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Precollisional development and Cenozoic evolution of the Southalpine retrobelt (European Alps)

Cited by 31 publications

References 72 publications

Postcollisional cooling history of the Eastern and Southern Alps and its linkage to Adria indentation

Postcollisional cooling history of the Eastern and Southern Alps and its linkage to Adria indentation

Continuity of the Alpine slab unraveled by high‐resolution P wave tomography

Kinematics and Age of Syn‐Intrusive Detachment Faulting in the Southern Alps: Evidence for Early Permian Crustal Extension and Implications for the Pangea A Versus B Controversy

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