The Western Alps from the Jurassic to Oligocene: spatio-temporal constraints and evolutionary reconstructions

Rosenbaum, Gideon and Lister, Gordon S. (2005) The Western Alps from the Jurassic to Oligocene: spatio-temporal constraints and evolutionary reconstructions. Earth-science Reviews, 69 3-4: 281-306. doi:10.1016/j.earscirev.2004.10.001

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Author Rosenbaum, Gideon
Lister, Gordon S.
Title The Western Alps from the Jurassic to Oligocene: spatio-temporal constraints and evolutionary reconstructions
Journal name Earth-science Reviews   Check publisher's open access policy
ISSN 0012-8252
1872-6828
Publication date 2005-03-01
Year available 2004
Sub-type Critical review of research, literature review, critical commentary
DOI 10.1016/j.earscirev.2004.10.001
Volume 69
Issue 3-4
Start page 281
End page 306
Total pages 26
Place of publication Amsterdam, Netherland
Publisher Elsevier Science
Language eng
Abstract Despite extensive research in the last 150 years, the regional tectonic reconstruction of the Western Alps has remained controversial. The curved orogenic belt consists of several ribbon-like continental terranes (Sesia/Austroalpine, Internal Crystalline Massifs, Brianconnais), which are separated by two or more ophiolitic sutures (Piemonte, Valais, Antrona?, Lanzo/ Canavese?). High-pressure (HP) metamorphism of each terrane occurred during distinct orogenic episodes: at similar to65 Ma in the Sesia/Austroalpine, at similar to45 Ma in the Piemonte zone and at similar to35 Ma in the Internal Crystalline Massifs. It is suggested that these events reflect individual accretionary episodes, which together with kinematic indicators and the speed and direction of plate motions, provide constraints for the discussed reconstruction model. The model involves a prolonged orogenic history that took place during relative convergence of Europe and Adria (here considered as a promontory of the African plate). The first accretionary event involved the Sesia/Austroalpine terrane. Final closure of the Piemonte Ocean occurred during the Eocene (similar to45 Ma) and involved ultra-high-pressure (UHP) metamorphism of the Piemonte oceanic crust. Incorporation of the Brianconnais terrane in the accretionary wedge occurred thereafter, possibly during or after subduction of the Valais Ocean in the late Eocene (45-35 Ma). This subduction was terminated at ca. 35 Ma, when the Internal Crystalline Massifs (i.e. the assumed internal parts of the Brianconnais terrane) were buried into great depths and underwent HP and UHP metamorphism. (C) 2004 Elsevier B.V. All rights reserved.
Keyword Geosciences, Multidisciplinary
Alps
Alpine Orogeny
Reconstruction
Ophiolite Complexes
Subduction
High-pressure Metamorphism
Dora-maira Massif
Zermatt-saas Ophiolite
Sesia-lanzo Zone
Greenschist Facies Deformation
Subducted Crustal Rocks
Nd Isotopic Behavior
Swiss-italian Alps
Monte-rosa
Rb-sr
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown
Additional Notes Available online 15 December 2004.

Document type: Journal Article
Sub-type: Critical review of research, literature review, critical commentary
Collections: Excellence in Research Australia (ERA) - Collection
School of Physical Sciences Publications
 
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Created: Tue, 14 Aug 2007, 01:03:08 EST