Variscan P–T deformation paths from the southwestern Aiguilles Rouges massif (External massif, western Alps) and their implication for its tectonic evolution

1998 ◽  
Vol 87 (1) ◽  
pp. 107-123 ◽  
Author(s):  
C. Dobmeier
Keyword(s):  
Tectonic Evolution ◽  
Western Alps ◽  
Aiguilles Rouges Massif ◽  
T Deformation Paths

Tectonic evolution of the Brian�onnais units along a transect (ECORS-CROP) through the Italian-French Western Alps

2004 ◽  
Vol 97 (3) ◽  
pp. 321-345 ◽  
Author(s):  
Stefan Bucher ◽  
Christina Ulardic ◽  
Romain Bousquet ◽  
Stefano Ceriani ◽  
Bernhard F�genschuh ◽  
...  
Keyword(s):  
Tectonic Evolution ◽  
Western Alps

Linking serpentinite geochemistry with tectonic evolution at the subduction plate-interface: The Voltri Massif case study (Ligurian Western Alps, Italy)

2016 ◽  
Vol 190 ◽  
pp. 115-133 ◽  
Author(s):  
E. Cannaò ◽  
M. Scambelluri ◽  
S. Agostini ◽  
S. Tonarini ◽  
M. Godard
Keyword(s):  
Tectonic Evolution ◽  
Western Alps ◽  
Plate Interface

Structural and metamorphic evolution of the Ambin massif (western Alps): toward a new alternative exhumation model for the Briançonnais domain

2007 ◽  
Vol 178 (6) ◽  
pp. 437-458 ◽  
Author(s):  
Jerome Ganne ◽  
Jean-Michel Bertrand ◽  
Serge Fudral ◽  
Didier Marquer ◽  
Olivier Vidal
Keyword(s):  
Tectonic Evolution ◽  
Large Scale ◽  
Regional Scale ◽  
Shear Bands ◽  
Shear Zones ◽  
Western Alps ◽  
Ductile Deformation ◽  
Movement Direction ◽  
Lower Grade ◽  
Structural Investigations

Abstract The basement domes of the central part of western Alps may result either from a multistage tectonic evolution with a dominant horizontal shortening component, an extensional behaviour, or both. The Ambin massif belongs to the “Briançonnais” domain and is located within the HP metamorphic zone. It was chosen for a reappraisal of the tectonic evolution of the Internal Alps in its western segment. Structural investigations have shown that Alpine HP rocks were exhumed in three successive stages. The D1 stage was roughly coeval with the observed peak metamorphic conditions and corresponds to a non-coaxial regime with dominant horizontal shortening and north movement direction. Petrological observations and P-T estimates show that the exhumation process was initiated during D1, the corresponding mechanism being still poorly understood. The D2 stage took place under low-blueschist facies conditions and culminated under greenschist facies conditions. It developed a retrogressive foliation and pervasive shear-zones at all scales that locally define major tectonic contacts. D2 shear zones show a top-to-east movement direction and correspond actually to large-scale detachment faults responsible for the juxtaposition of less metamorphic units above the Ambin basement and thus to a large part of the exhumation of HP rocks toward the surface. D2 shear zones were subsequently deformed by D3 open folds, large antiforms (e.g. the Ambin dome) and associated brittle-ductile D3 shear-bands. The D1 to D3 P-T conditions and P-T path of the blueschists occurring in the deepest part of the Ambin dome, was estimated by using the multi-equilibrium thermobarometric method of the Tweeq and Thermocalc softwares. Peak pressure conditions, estimated at about 14–16 Kb, 500oC, are followed by a nearly-isothermal decompression that occurred concurrently with the major D1–D2 change in the ductile deformation regime. Eastwards, the Schistes Lustrés units exhibit a similar geometry on top of the Gran Paradiso dome but exhibit opposite D2 movement direction. Lower-grade units are lying above higher-grade units, the shear zones occurring in between being similar to Ambin’s D2 detachments. Thus at regional scale, the D2 detachments seem to form together with the Ambin shear-zones, a network of conjugate detachments. Such a pattern suggests that the exhumation history is mostly controlled by a D2+D3 crustal-scale vertical shortening resulting in the thinning of the previous tectonic pile formed during D1. The slab-break off hypothesis may explain such an extensional behaviour within the western Pennine domain. It is suggested that the thermo-mechanical rebound of the residual European slab initiated between 35 and 32 Ma the fast exhumation of the previously thickened orogenic wedge (stack of D1 HP slices). It was immediately followed by a collapse of the wedge that may correspond to the E-W Oligocene extensional event responsible for the opening of rifts in the West European platform.

scholarly journals Role of the Down-Bending Plate as a Detrital Source in Convergent Systems Revealed by U–Pb Dating of Zircon Grains: Insights from the Southern Andes and Western Italian Alps

Minerals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 632
Author(s):  
Andrea Di Giulio ◽  
Chiara Amadori ◽  
Pierre Mueller ◽  
Antonio Langone
Keyword(s):  
Tectonic Evolution ◽  
Subduction Zones ◽  
Western Alps ◽  
Published Data ◽  
Continental Margins ◽  
Provenance Analysis ◽  
Clastic Sediments ◽  
Continental Block ◽  
Back Arc ◽  
Subduction System

In convergent zones, several parts of the geodynamic system (e.g., continental margins, back-arc regions) can be deformed, uplifted, and eroded through time, each of them potentially delivering clastic sediments to neighboring basins. Tectonically driven events are mostly recorded in syntectonic clastic systems accumulated into different kinds of basins: trench, fore-arc, and back-arc basins in subduction zones and foredeep, thrust-top, and episutural basins in collisional settings. The most widely used tools for provenance analysis of synorogenic sediments and for unraveling the tectonic evolution of convergent zones are sandstone petrography and U–Pb dating of detrital zircon. In this paper, we present a comparison of previously published data discussing how these techniques are used to constrain provenance reconstructions and contribute to a better understanding of the tectonic evolution of (i) the Cretaceous transition from extensional to compressional regimes in the back-arc region of the southern Andean system; and (ii) the involvement of the passive European continental margin in the Western Alps subduction system during impending Alpine collision. In both cases, sediments delivered from the down-bending continental block are significantly involved. Our findings highlight its role as a detrital source, which is generally underestimated or even ignored in current tectonic models.

scholarly journals The Lac Cornu retrograded eclogites (Aiguilles Rouges massif, Western Alps, France): evidence of crustal origin and metasomatic alteration

Lithos ◽  
1981 ◽  
Vol 14 (1) ◽  
pp. 35-48 ◽  
Author(s):  
Jean-Paul Liégeois ◽  
Jean-Clair Duchesne
Keyword(s):  
Western Alps ◽  
Metasomatic Alteration ◽  
Aiguilles Rouges Massif ◽  
Crustal Origin

Garnet evolution in pre-Variscan pelitic rocks from the Lake Emosson area, Aiguilles Rouges Massif, Western Alps

1985 ◽  
Vol 3 (4) ◽  
pp. 467-479 ◽  
Author(s):  
JÜRGEN F. VON RAUMER ◽  
HANS W. SCHWANDER
Keyword(s):  
Western Alps ◽  
Aiguilles Rouges Massif ◽  
Pelitic Rocks

On the syn-orogenic basins of the Alps-Apennines tectonic system in NW Italy

2021 ◽  
Author(s):  
Fabrizio Piana ◽  
Anna d'Atri ◽  
Andrea Irace
Keyword(s):  
Tectonic Evolution ◽  
Middle Eocene ◽  
Regional Scale ◽  
Foreland Basin ◽  
Mediterranean Area ◽  
Western Alps ◽  
Western Mediterranean ◽  
Late Oligocene ◽  
The Alps ◽  
Nw Italy

<p>The Alps and the westernmost part of Apennines physically join in NW Italy (Piemonte), where the Apennine thrusts interfered, since Late Oligocene, with both the inner boundary faults of the uplifting Alps axial belt and the outer fronts of the Alpine antithetic retrobelt (the Southern Alps). As the two orogenic belts had been intergrowing since the late Oligocene, coeval syn-orogenic basins developed on both, either as separate depocenters or, more frequently, to form a continuous sedimentary domain, strongly controlled by the tectonic evolution of the Alps-Apennines orogenic system.  These syn-orogenic basins both recorded the main stages of the Alps (neoAlpine events) and Apennines tectonic evolution, whose evidence (mostly represented by regional-scale unconformities) can be correlated within each basin and across them. Correlations (in terms of sharing common geologic events) can be found also with the middle Eocene to lower Oligocene basal part of the Alpine foreland basin succession, which extended continuously on the external side of the Western Alps. This contribution will briefly discuss this complex matter in an integrated Alpine-Apennines perspective and in the frame of the post-Eocene evolution of the Western Mediterranean area.</p>

Alpine tectonic evolution and thermal water circulations of the Argentera Massif (South-Western Alps)

2009 ◽  
Vol 102 (2) ◽  
pp. 223-245 ◽  
Author(s):  
Alessandro Baietto ◽  
P. Perello ◽  
P. Cadoppi ◽  
G. Martinotti
Keyword(s):  
Tectonic Evolution ◽  
Thermal Water ◽  
Western Alps

Water-assisted migmatization of metagraywackes in a Variscan shear zone, Aiguilles-Rouges massif, western Alps

Lithos ◽  
2008 ◽  
Vol 102 (3-4) ◽  
pp. 575-597 ◽  
Author(s):  
Florian Genier ◽  
François Bussy ◽  
Jean-Luc Epard ◽  
Lukas Baumgartner
Keyword(s):  
Shear Zone ◽  
Western Alps ◽  
Aiguilles Rouges Massif
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