Western Préalpes Médianes Romandes: Timing and structure. A review.

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Serval ID
serval:BIB_0F0A284C0DC2
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Western Préalpes Médianes Romandes: Timing and structure. A review.
Journal
Eclogae Geologicae Helvetiae
Author(s)
Mosar J., Stampfli G.M., Girod F.
ISSN-L
0012-9402
Publication state
Published
Issued date
1996
Peer-reviewed
Oui
Volume
89
Pages
389-425
Language
english
Abstract
Between the original position and their present day location as klippen,
the Prealpes Medianes underwent a complex history of paleotectonics and
alpine tectonics. Due to the opening of the Piemont ocean the
Brianconnais sedimentation realm of the Prealpes Medianes evolved as a
rim basin of the northern passive margin during Jurassic to Eocene
times. Different paleotectonic features (normal faults, synsedimentary
growth structures, inversion structures) developed and were active above
a basal detachment in evaporitic layers. The tectonic movements were a
consequence of thermal events in the crust. Isolated from the Iberic
continent at the end of the Late Cretaceous, the Brianconnais exotic
terrain was incorporated into the accretionary prism of the closing
Piemont ocean and the incipient alpine orogeny during the
Lutetian-Bartonian. The Prealpes Medianes were detached from their
homeland during the Bartonian-Priabonian and were transported onto the
foreland. The tectonic style is one of a thin-skinned foreland fold and
thrust belt. Fault associated fold development above a main decollement,
together with internal deformation, represent the Prealpes Medianes main
structural features. The very low-grade metamorphic conditions have
their origin in the heat flux induced by tectonic burial by overriding
nappes in the accretionary prism. After having been transported on top
of the developing Helvetic nappes the Prealpes were emplaced in their
present day position in front of the Alpine mountain belt during
Oligocene times. Post-emplacement and out of sequence thrusting,
possibly younger than Oligocene, is observed and can be related to
thrusting in the sedimentary substratum and the basement.
Create date
20/10/2012 19:11
Last modification date
20/08/2019 13:35
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