Affordable Access

Publisher Website

Basement-cover relationships in the Tambo nappe (Central Alps, Switzerland): geometry, structure and kinematics

Journal of Structural Geology
Publication Date
DOI: 10.1016/0191-8141(93)90147-3
  • Earth Science


Abstract In the Pennine zone of the Central Alps, the Tambo nappe forms a thin crystalline sliver embedded in the Mesozoic cover. Four Tertiary Alpine deformations are observed. The D 1 ductile deformation is linked to the progressive Eocene stacking of the nappes towards the northwest. During D 1, basement deformation is governed by imbricate tectonics whereas cover is thin-skinned and intensively folded. These different structures reflect the original strong rheological contrast between basement and cover. During the heterogeneous and ductile D 2 deformation, the behaviour of the basement and cover became similar. The strong vertical D 2 shortening, associated with a ‘top-to-the-east’ shear, led to the folding of the prior SE-dipping structures, developing SE-vergent folds with axes close to the E-W L 2 stretching lineation. D 2 corresponds to post-collisional crustal thinning following D 2 crustal thickening. The D 3 and D 4 deformations occurred under retrograde conditions and can be correlated with uplift and late dextral movement on the Insubric line, respectively.

There are no comments yet on this publication. Be the first to share your thoughts.