Skip to Main content Skip to Navigation
Journal articles

Late orogenic evolution of the Variscan lithosphere: Nd isotopic constraints from the western Alps

S. Cannic 1 Henriette Lapierre 1 P. Monié 2 L. Briqueu 2 Christophe Basile 1
1 LGCA - Laboratoire de Géodynamique des Chaines Alpines
2 ISTEEM - Institut des Sciences de la Terre, de l'Environnement et de l'Espace de Montpellier
Abstract : We performed geochemical analyses (major- and trace-elements, Nd isotopes) of Late Variscan igneous rocks from the western Alps in order to better constrain the lithospheric evolution at the end of the Variscan orogeny. In the western Alps, the shoshonitic suite from the Croix de Fer pass and the alkaline Combeynot granite were emplaced during the Late Carboniferous. They were followed during the Early Permian by the calc-alkaline diorite porphyries from the “Zone Houillère Briançonnaise”, dated by 40Ar–39Ar, and by the calc-alkaline rhyodacites from the Guil valley. These suites postdate the Variscan orogeny and originated in a regime of lithospheric extension and thinning affecting the entire domain of the European Variscan belt. They display subduction-related geochemical features with the exception of the Combeynot granite. The Croix de Fer suite, the diorite porphyries from the Zone Houillère Briançonnaise and the felsic lavas from the Guil valley show the lowest (–7 >
Keywords : Permo-Carboniferous post-orogenic magmatism trace element chemistry Nd isotopic composition western Alps
Document type :
Journal articles
Complete list of metadatas
https://hal-insu.archives-ouvertes.fr/insu-00350372
Contributor : Pascale Talour <>
Submitted on : Tuesday, January 6, 2009 - 3:31:19 PM
Last modification on : Friday, September 25, 2020 - 3:13:58 AM

Identifiers

  • HAL Id : insu-00350372, version 1

Collections

INSU | CNRS | UNIV-SAVOIE | UGA | IRSTEA | INRAE

Citation

S. Cannic, Henriette Lapierre, P. Monié, L. Briqueu, Christophe Basile. Late orogenic evolution of the Variscan lithosphere: Nd isotopic constraints from the western Alps. Schweizerische Mineralogische und Petrographische Mitteilungen, 2002, 82 (1), pp.77 à 99. ⟨insu-00350372⟩

Export

BibTeX TEI DC DCterms EndNote

Share

Metrics

Record views

258