Collision kinematics in the western external Alps

Bellahsen, Nicolas; Mouthereau, Frédéric; Boutoux, Alexandre; Bellanger, Mathieu; Lacombe, Olivier; Jolivet, Laurent; Rolland, Yann

doi:10.1002/2013tc003453

Cited by 126 publications

(159 citation statements)

References 87 publications

(316 reference statements)

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“…9b). According to Boyer [1995], this tilting is consistent with primary basin taper angle observed in fold-and-thrust belt for the Canadian Rockies, the Jura or the Alps [Bally et al, 1966;Mugnier and Vialon, 1986;Bellahsen et al, 2014;Jourdon et al, 2014]. This low increase of basement tilting beneath sedimentary basin between the earliest Cenomanian state (Durance high) and latest Santonian state could correspond to the basin dip far away from the depocenter, to the most external part of the foreland.…”

Section: Flexure Kinematic Model and Paleostructures Of The Pyreneansupporting

confidence: 76%

Structural style and evolution of the Pyrenean-Provence thrust belt, SE France

Bestani

Espurt

Lamarche

et al. 2015

Bulletin De La Société Géologique De France

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The Pyrenean-Provence fold-thrust belt is characterized by a geological complexity arising from superimposed tectonic history and the propagation of the deformation through a heterogeneous mechanical substratum inherited from Paleozoic and Mesozoic times. The construction of a regional balanced cross section together with field data show that the thrust system of the southeastern Provence region is characterized by a mixed thick-and thin-skinned tectonic style related to the inversion of deep-seated late Paleozoic-Triassic extensional structures and the décollement of the Mesozoic-Cenozoic sedimentary cover above Triassic series. Earliest Cenomanian restoration state highlights the northward pinched-out of the Lower Cretaceous sedimentary series above the main long-wavelength Durance High uplift. Latest Santonian restoration state indicates a southward tilting of~2 o of the basin attributed to the initial growth of the Pyrenean-Provence prism controlling the external flexure of the foreland. Thrusts propagation in the northern part of the Pyrenean-Provence fold-thrust belt was recorded to be synchronous during latest Cretaceous to Eocene time and produced a~7 o southward basin tilting. This major tilting is attributed to the tectonic inversion and basement thrust stacking of the Cap Sicié-Sainte Baume units. Cross section balancing shows a total horizontal basement shortening of 40 km (~35 %) across the Pyrenean-Provence foreland. The main part of this shortening (~37 km) was accommodated by thick-skinned thrusts involving basement south of the Arc syncline.~5 km of shortening were accommodated northward by the Arc syncline and eastern Sainte-Victoire thin-skin structures, resulting from slip transferred from the deep thick-skinned intercutaneous thrust wedge. Finally we interpret salt tectonic structures of the southeastern Provence as passive diapirism growth during Jurassic to late Cretaceous time, and then reactivated during Pyrenean-Provence compression. Late normal faulting related to hypothetical reactive diapirism during the Oligocene extension episode was predominantly localized above inherited salt structures and probably controlled by inherited basement faults. Style structural et évolution de l'avant-pays pyrénéo-provençal, SE FranceMots-clés. -Architecture structurale, Inversion tectonique, Héritage, Coupes équilibrées, Avant-pays pyrénéo-provençalRésumé. -L'avant-pays pyrénéo-provençal est caractérisé par une structure géologique complexe résultant d'une histoire tectonique polyphasée et de la propagation de la déformation dans un substratum mécanique hétérogène qui est hé-rité du Paléozoïque et du Mésozoïque. La construction d'une coupe équilibrée régionale ainsi que les données de terrain montrent que l'avant-pays provençal, localisé dans le SE de la région de Provence, est caractérisé par un style tectonique mixte de couverture et de socle relié à l'inversion de structures extensives profondes du Paléozoïque supé-rieur-Trias et de décollements de la couverture sédimentaire Mésozoïque-Cénozoïque s...

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Section: Flexure Kinematic Model and Paleostructures Of The Pyreneansupporting

confidence: 76%

Structural style and evolution of the Pyrenean-Provence thrust belt, SE France

Bestani

Espurt

Lamarche

et al. 2015

Bulletin De La Société Géologique De France

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“…Thus for Alpine geologists the involvement of crystalline basement in nappe tectonics was never questioned. The thick-and thin-skinned involvement of crystalline basement in Alpine nappe tectonics has been discussed recently by [1,38,120,192,193] and will thus be touched briefly only here. The two examples presented below, the Western and Eastern Alps, were chosen for their particular aspects regarding tectonic style.…”

Section: Western and Eastern Alpsmentioning

confidence: 99%

Thick-Skinned and Thin-Skinned Tectonics: A Global Perspective

Pfiffner

2017

Geosciences

125

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This paper gives an overview of the large-scale tectonic styles encountered in orogens worldwide. Thin-skinned and thick-skinned tectonics represent two end member styles recognized in mountain ranges. Both styles are encountered in former passive margins of continental plates. Thick-skinned style including the entire crust and possibly the lithospheric mantle are associated with intracontinental contraction. Delamination of subducting continental crust and horizontal protrusion of upper plate crust into the opening gap occurs in the terminal stage of continent-continent collision. Continental crust thinned prior to contraction is likely to develop relatively thin thrust sheets of crystalline basement. A true thin-skinned type requires a detachment layer of sufficient thickness. Thickness of the décollement layer as well as the mechanical contrast between décollement layer and detached cover control the style of folding and thrusting within the detached cover units. In subduction-related orogens, thin-and thick-skinned deformation may occur several hundreds of kilometers from the plate contact zone. Basin inversion resulting from horizontal contraction may lead to the formation of basement uplifts by the combined reactivation of pre-existing normal faults and initiation of new reverse faults. In most orogens thick-skinned and thin-skinned structures both occur and evolve with a pattern where nappe stacking propagates outward and downward.

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“…Thus for Alpine geologists the involvement of crystalline basement in nappe tectonics was never questioned. The thick-and thin-skinned involvement of crystalline basement in Alpine nappe tectonics has been discussed recently by [113], [35,183] and [1,184] and will thus be touched briefly only here. The two examples presented below, the Western and Eastern Alps, were chosen for their particular aspects regarding tectonic style.…”

Section: Western and Eastern Alpsmentioning

confidence: 99%

Thick-Skinned and Thin-Skinned Tectonics: A Global Perspective

Pfiffner¹

2017

Preprint

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This paper gives an overview of the large-scale tectonic styles encountered in orogens worldwide. Thin-skinned and thick-skinned tectonics represents two end member styles recognized in mountain ranges. A thick-skinned tectonic style is typical for margins of continental plates. Thick-skinned style including the entire crust and possibly the lithospheric mantle are associated with intracontinental contraction. Delamination of subducting continental crust and horizontal protrusion of upper plate crust into the opening gap occurs in the terminal stage of continent-continent collision. Continental crust thinned prior to contraction is likely to develop relatively thin thrust sheets of crystalline basement. A true thin-skinned type requires a detachment layer of sufficient thickness. Thickness of the décollement layer as well as the mechanical contrast between décollement layer and detached cover control the style of folding and thrusting within the detached cover units. In subduction related orogens, thin-and thick-skinned deformation may occur several hundreds of kilometers from the plate contact zone. Basin inversion resulting from horizontal contraction may lead to the formation of basement uplifts by the combined reactivation of pre-existing normal faults and initiation of new reverse faults. In composite orogens thick-skinned and thin-skinned structures evolve with a pattern where nappe stacking propagates outward and downward.

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Collision kinematics in the western external Alps

Cited by 126 publications

References 87 publications

Structural style and evolution of the Pyrenean-Provence thrust belt, SE France

Structural style and evolution of the Pyrenean-Provence thrust belt, SE France

Thick-Skinned and Thin-Skinned Tectonics: A Global Perspective

Thick-Skinned and Thin-Skinned Tectonics: A Global Perspective

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