Subduction of continental crust in the Western Alps

Marchant, Robin; Stampfli, Gérard M.

doi:10.1016/s0040-1951(96)00170-9

Cited by 44 publications

(40 citation statements)

References 34 publications

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“…Bergell intrusion) and the rapid Early Oligocene transgression on the Helvetic domain following a temporary de-flexuring of the lower plate and which created an underfilling of the foreland basin at that time (Sinclair, 1997). This phenomenon allowed further subduction of the European plate (Marchant and Stampfli, 1997a). Younger phases of advance of the prism into the European margin are well recorded by the Molasse basin deposits (e.g.…”

Section: Subduction-obduction Processesmentioning

confidence: 78%

“…Decoupling of this basement left some room for continental subduction of the European plate (Marchant and Stampfli, 1997a) at least until the Pliocene. The overfed prism developed large-scale backthrusting and the Adriatic indenter and Insubric line turned into an A-subduction zone with important southward thrusting of the southern Alps (Figs.…”

Section: Ongoing Subduction and Collisionmentioning

confidence: 99%

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Subduction and obduction processes in the Swiss Alps

et al. 1998

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The significance of the Briançonnais domain in the Alpine orogen is reviewed in the light of data concerning its collision with the active Adriatic margin and the passive Helvetic margin. The Briançonnais which formerly belonged to the Iberian plate, was located on the northern margin of the Alpine Tethys (Liguro-Piémont ocean) since its opening in the early-Middle Jurassic. Together with the Iberian plate the Briançonnais terrane was separated from the European plate in the Late Jurassic-Early Cretaceous, following the northern Atlantic, Bay of Biscay, Valais ocean opening. This was accompanied by the onset of subduction along the northern margin of Adria and the closure of the Alpine Tethys. Stratigraphic and metamorphic data regarding this subduction and the geohistory of the Briançonnais allows the scenario of subduction-obduction processes during the Late Cretaceous-early Tertiary in the eastern and western Alps to be specified. HP-LT metamorphism record a long-lasting history of oceanic subduction-accretion, followed in the Middle Eocene by the incorporation of the Briançonnais as an exotic terrane into the accretionary prism. Middle to Late Eocene cooling ages of the Briançonnais basement and the presence of pelagic, anorogenic sedimentation lasting until the Middle Eocene on the Briançonnais preclude any sort of collision before that time between this domain and the active Adria margin or the Helvetic margin. This is confirmed by plate reconstructions constrained by magnetic anomalies in the Atlantic domain. Only a small percentage of the former Briançonnais domain was obducted, most of the crust and lithospheric roots were subducted. This applies also to domains formerly belonging to the southern Alpine Tethys margin (Austroalpine-inner Carpathian domain). It is proposed that there was a single Palaeogene subduction zone responsible for the Alpine orogen formation (from northern Spain to the East Carpathians), with the exception of a short-lived Late Cretaceous partial closure of the Valais ocean. Subduction in the western Tethyan domain originated during the closure of the Meliata ocean during the Jurassic incorporating the Austroalpine-Carpathian domain as terranes during the Cretaceous. The subduction zone propagated into the northern margin of Adria and then to the northern margin of the Iberian plate, where it gave birth to the Pyrenean-Provençal orogenic belt. This implies the absence of a separated Cretaceous subduction zone within the Austro-Carpathian Penninic ocean. Collision of Iberia with Europe forced the subduction to jump to the SE margin of Iberia in the Eocene, creating the Apenninic orogenic wedge and inverting the vergence of subduction from south-to north-directed.

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Section: Subduction-obduction Processesmentioning

confidence: 78%

Section: Ongoing Subduction and Collisionmentioning

confidence: 99%

Subduction and obduction processes in the Swiss Alps

et al. 1998

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“…Kozur and Mock (1996) considered the Pieniny Basin to be a northern branch of the (southern) Penninic Ocean in the Western Alps, existing already in the Early Triassic. The oblique rift probably had a WSW-ENE or SW-NE trend (Marchant and Stampfli 1997;Stampfli et al 1998;Dumont et al 1996;Jurewicz 2005). Plašienka (1999) divided the Penninic Basin into the Vahicum (Vahic) and Magura subbasins, separated by the Oravicum (Oravic, Czorsztyn Ridge).…”

Section: Geological Settingmentioning

confidence: 99%

The Šariš Transitional Zone, revealing interactions between Pieniny Klippen Belt, Outer Carpathians and European platform

Jurewicz

2018

Swiss J Geosci

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The Pieniny Klippen Belt (PKB) is a narrow structure delineating the boundary between the Central and Outer Carpathians. It is built of nappes stacked during the Cretaceous and Paleocene and then re-folded in the Miocene during the formation of the Outer Carpathian overthrusts. The internal structure of the PKB at the Polish/Slovakian border first formed during northward nappe thrusting processes, which were most intense at the turn of the Cretaceous to the Paleocene. A secondary factor is the change in strike of the PKB turning from W-E to WNW-

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“…. The resulting heat flux allowed some more units to be detached from the European continental slabs and resulted in large scale subduction of continental material (Marchant and Stampfli, 1997b) and obduction of the more external units:…”

Section: The Overall Tectonic Evolutionmentioning

confidence: 99%

“…The present structural framework of the western Alps is shown in figures 1 and 2 (modified from Marchant, 1993;Marchant and Stampfli, 1997a;Marchant and Stampfli, 1997b), and are based on a structural model developed mainly by the Lausanne school (e.g Escher et al, 1997;Escher et al, 1988;Steck et al, 1997;Steck et al, 1989). …”

Section: The Structural Framework Of the Western Alpsmentioning

confidence: 99%