Record details

Title
    The formation of the West European rift: A new model as exemplified by the Massif Central area
Statement of responsibility
    Olivier Merle, Laurent Michon
Other titles
    La formation du rift Ouest-européen: un nouveau modele tectonique
Author
    Merle, Olivier
    Michon, Laurent
Language
    anglicky
Source title - serial
    Bulletin de la Société Géologique de France
Vol./nr.
    Vol. 172, no. 2
Pages
    p. 213-221
Year
    2001
Notes
    5 obr., 2 s.bibl.
    Francouzské resumé
    il.
    Zkr. název ser.: Bull. Soc. géol. France
Subject group
    astenosféra
    geologie hlubinná
    litosféra
    příkopová propadlina
    terciér
    terciér Českého masivu
    vrásnění alpinské
    vulkanismus
    zóna riftová
Geographical name
    ČR-Čechy
    Francie
    SRN
Keyword
    Area
    Central
    European
    Exemplified
    Formation
    Massif
    Model
    New
    Rift
    West
Abstract (in english)
   In this paper, we use mainly field fata from the Massif Central area, which have been presented in a companion paper (Michon and Merle, 2001), to discuss the origin and the evolution of the West Eropean Rift system. It is shown that the tectonic event in the Tertiary is two-stage. The overall geological evolution reveal a tectonic paradoxe as the first stage strongly suggests passive rifting, whereas the second stage displays the first stage of active rifting. In the north, crustal thinning, graben formation and sedimentation at sea level without volcanism during the Lower Oligocene, followed by scattered volcanism in a thinned area during Upper Oligocene and Lower Miocene, represent the classical evolution of a rift resulting from extensional stresses within the lithosphere (i.e. passive rifting).
   In the south, zhinning of the lithospheric mantle associated with doming and volcanism in the Upper Miocene, together with the lack of rustal thinning, may be easily interpreted in terms of the first stage of active rifting due to the ascent of a mantle plume. This active rifting process would have been inhibited before stretchning of the crust, as asthenospheric rise associated with uplift and volcanism are the only tectonic events observed. The diachronism of these two events is emphasized by two-clearly distinct orientations of crustal thinning in the north and mantle lithospheric thinning in the south. To understant this tectonic paradox, a new model is discussed taking into acount the Tertiary evolution of the Alpine chain
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    25. 3. 2008
Import date
    8. 8. 2012