Data from remote sensing, structural geology and thermochronology provide the basis for this integrated reconstruction of the Oligocene to Present kinematic evolution of the north-western Alpine nappe stack. Two brittle tectonic phases post-date the Cretaceous-Eocene ductile deformation. A NW-SE extension developed in the Oligocene (D1) along three main conjugate fault systems arranged in orthorhombic symmetry (N-NW- and SE-dipping). Cooling rate contour maps, from published apatite and zircon fission-tract ages and Rb/Sr biotite ages, highlight the differential exhumation of large fault-bounded blocks during this phase, whilst synkinematic hydrothermal veins and calc-alkaline dykes (29-32 Ma) help to constrain its age. From the Miocene onwards, a general rearrangement of the strain pattern led to SW-directed lateral extrusion (D2) of the Pennine-Graian Alps block, bounded by a network of seismogenic shear zones, the most important being the Ospizio Sottile. Simplon. Rhone and Chamonix faults. The internal deformation of the Pennine-Graian Alps block is characterised by an overall more or less homogeneous NE-SW extension. The approach undertaken, integrating remote sensing. structural analysis on different scales, and thermochronology (with the cooling rate map representation), is therefore effective in reconstructing the late-orogenic extensional tectonic evolution of metamorphic nappe stacks.
Bistacchi, A., & Massironi, M. (2000). Post-nappe brittle tectonics and kinematic evolution of the north-western Alps: an integrated approach. TECTONOPHYSICS, 327(3-4), 267-292.
|Citazione:||Bistacchi, A., & Massironi, M. (2000). Post-nappe brittle tectonics and kinematic evolution of the north-western Alps: an integrated approach. TECTONOPHYSICS, 327(3-4), 267-292.|
|Tipo:||Articolo in rivista - Articolo scientifico|
|Carattere della pubblicazione:||Scientifica|
|Titolo:||Post-nappe brittle tectonics and kinematic evolution of the north-western Alps: an integrated approach|
|Autori:||Bistacchi, A; Massironi, M|
|Data di pubblicazione:||2000|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1016/S0040-1951(00)00206-7|
|Appare nelle tipologie:||01 - Articolo su rivista|