What is the tectono-metamorphic evolution of continental break-up: The example of the Tasna Ocean–Continent Transition

Manatschal, Giänreto; Engström, Arne; Desmurs, Laurent; Schaltegger, Urs; Cosca, M. A.; Müntener, Othmar; Bernoulli, Daniel

doi:10.1016/j.jsg.2006.07.014

Cited by 89 publications

(95 citation statements)

References 38 publications

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“…Hauser and Müntener, 2011;Manatschal et al, 2006). This situation is similar to that already documented for the Briançonnais domain and in the Middle Penninic units (e.g.…”

Section: The Adula Nappesupporting

confidence: 86%

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New stratigraphic data from the Lower Penninic between the Adula nappe and the Gotthard massif and consequences for the tectonics and the paleogeography of the Central Alps

et al. 2012

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New stratigraphic data along a profile from the Helvetic Gotthard massif to the remnants of the North Penninic basin in eastern Ticino and Graubünden are presented. The stratigraphic record together with existing geochemical and structural data, motivate a new interpretation of the fossil European distal margin. We introduce a new group of Triassic facies, the North-Penninic-Triassic (NPT), which is characterised by the Ladinian "dolomie bicolori". The NPT was located in-between the Briançonnais carbonate platform and the Helvetic lands. The observed horizontal transition, coupled with the stratigraphic superposition of a Helvetic Liassic on a Briaçonnais Triassic in the Luzzone-Terri nappe, links, prior to Jurassic rifting, the Briançonnais paleogeographic domain at the Helvetic margin, south of the Gotthard. Our observations suggest that the Jurassic rifting separated the Briançonnais domain from the Helvetic margin by complex and protracted extension. The syn-rift stratigraphic record in the Adula nappe and surroundings suggests the presence of a diffuse rising area with only moderately subsiding basins above a thinned continental and proto-oceanic crust. Strong subsidence occurred in a second phase following protracted extension and the resulting delamination of the rising area. The stratigraphic coherency in the Adula's Mesozoic questions the idea of a lithospheric mélange in the eclogitic Adula nappe, which is more likely to be a coherent alpine tectonic unit. The structural and stratigraphic observations in the Piz Terri-Lunschania zone suggest the activity of syn-rift detachments. During the alpine collision these faults are reactivated (and inverted) and played a major role in allowing the Adula subduction, the "Penninic Thrust" above it and in creating the structural complexity of the Central Alps.

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“…Hauser and Müntener, 2011;Manatschal et al, 2006). This situation is similar to that already documented for the Briançonnais domain and in the Middle Penninic units (e.g.…”

Section: The Adula Nappesupporting

confidence: 86%

“…We explain this protracted history as follows (partly inspired by Manatschal et al (2006Manatschal et al ( , 2007, Mohn et al (2010) and Péron-Pinvidic et al (2007), Manatschal, 2009 andPéron-Pinvidic et al, 2010):…”

Section: The Plattenberg and Garzott Breccias: A Second Rifting Or A mentioning

confidence: 99%

New stratigraphic data from the Lower Penninic between the Adula nappe and the Gotthard massif and consequences for the tectonics and the paleogeography of the Central Alps

et al. 2012

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“…This attribution is primarily based on the recent SHRIMP U-Pb dating of a leuco-gabbro as part of a layered magmatic sequence found at the base of the Aiguille du Clapet peak by Beltrando et al (2007), which also yielded a Permian age (272 ± 2 Ma). This indicates bi-modal magmatism typical for Early Permian times and found in many other parts of the Alps that expose lower crustal rocks later exhumed near an ocean-continent transition (Sesia zone: Rubatto et al 1999;Ivrea zone: Handy et al 1999;Val Malenco area: Hermann et al 1997;Engadine window: Froitzheim and Rubatto 1998;Manatschal et al 2006). Hence, it appears that the Permian leuco-gabbros, together with the granitoids from the Punta Rossa area, are part of a basement that is older than the Complexe Antéflysch Formation and that predates the 2 m tr a n s it io n z o n e A r o le y F r o m a ti o n C o m p le x e A n té fl y s c h F m .…”

Section: Stratigraphy and Lithological Compositionsmentioning

confidence: 69%

“…As a consequence, the important question arises as to whether the dated mafics and granitoids, which are part of the Punta Rossa Complex, represent a piece of Variscan basement exhibiting pre-Alpine deformation and metamorphism, or alternatively, postVariscan magmatic rocks of Permian age, deformed and metamorphosed during the Alpine cycle. In the light of our stratigraphic and structural data, as well as very detailed mapping (Dalla Torre 1998), we prefer the second option that would indicate bimodal magmatism typical for Permian times and found in many other parts of the Alps that expose lower crustal rocks, later exhumed near an ocean-continent transition (Rubatto et al 1999;Handy et al1999;Hermann et al 1997;Froitzheim and Rubatto 1998;Manatschal et al 2006).…”

Section: Discussionmentioning

confidence: 99%

“…Their attribution to a pre-Barremian-Aptian rifting and drifting event related to the opening of the Valais ocean still needs to be tested. At this stage, this inference is primarily based on, first, the presence of serpentinites, interpreted to have been emplaced on the ocean floor near an ocean-continent transition in Cretaceous times as is documented for the Pyrenees (Lagabrielle and Bodinier 2008) and the Valais units of the Alps (Froitzheim and Rubatto 1998;Manatschal et al 2006), and second, on the geochemical signatures of the mafic sills (Mugnier et al 2008).…”

Section: Discussionmentioning

confidence: 99%

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The Valais units in Savoy (France): a key area for understanding the palaeogeography and the tectonic evolution of the Western Alps

Loprieno

Bousquet

Bucher³

et al. 2010

Int J Earth Sci (Geol Rundsch)

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Collision kinematics in the western external Alps

et al. 2014

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The kinematics of the collision in Western Alps are investigated through five balanced cross sections of the whole external domain from the Oisans to the Mont Blanc massif. These cross sections were built using published data for the Jura and subalpine fold-and-thrust belts and new structural and field analysis for the External Crystalline Massifs. Five units are defined: the sedimentary nappes from innermost parts of the external zone (e.g., ultra-Dauphinois/Helvetic), the crystalline units with their dysharmonically folded cover (e.g., Morcles nappe), sedimentary nappes over the frontal parts of the crystalline massifs (the Aravis-Granier unit), the subalpine belts (e.g., Vercors, Chartreuse, Bauges, and Bornes), and the Jura. Except for the ultra-Dauphinois nappes, the shortening, including the cover shortening, always corresponds to basement shortening. The total amount of shortening increases from south (28 km, 20%) to north (66 km, 27%). Moreover, the shortening is slightly older in the south than in the north; deepwater turbidites (flysch) and shallow marine to freshwater clastics (molasse) basins are more developed in the north; pressure and temperature conditions are higher in the north; the average uplift rates are about 3 times higher in the north and more localized in space. We propose that these differences are due to along-strike variations in the structure of the European continental margin inherited from Mesozoic times. We then build five palinspastic maps: one at Cretaceous times showing the inherited European Mesozoic margin structure and four from Priabonian to upper Miocene times showing the collision kinematics and the related rotation of Adria.

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What is the tectono-metamorphic evolution of continental break-up: The example of the Tasna Ocean–Continent Transition

Cited by 89 publications

References 38 publications

New stratigraphic data from the Lower Penninic between the Adula nappe and the Gotthard massif and consequences for the tectonics and the paleogeography of the Central Alps

New stratigraphic data from the Lower Penninic between the Adula nappe and the Gotthard massif and consequences for the tectonics and the paleogeography of the Central Alps

The Valais units in Savoy (France): a key area for understanding the palaeogeography and the tectonic evolution of the Western Alps

Collision kinematics in the western external Alps

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