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    Kinematic linkage between internal zone extension and shortening in more external units in the NW Alps

    19438_downloaded_stream_530.pdf (131.1Kb)
    Access Status
    Open access
    Authors
    Wheeler, J.
    Reddy, Steven
    Cliff, R.
    Date
    2001
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Wheeler, J. and Reddy, S.M. and Cliff, R.A.. 2001. Kinematic linkage between internal zone extension and shortening in more external units in the NW Alps. Journal of the Geological Society 158 (3): 439-443.
    Source Title
    Journal of the Geological Society
    Additional URLs
    http://www.lyellcollection.org/
    Faculty
    Department of Applied Geology
    Division of Resources and Environment
    Remarks

    Copyright (c) 2001 The Geological Society of London.

    This material has been published in the Journal of the Geological Society (2001) 158: 439-443 the only definitive repository of the content that has been certified and accepted after peer review.

    Copyright and all rights therein are retained by The Geological Society of London.

    URI
    http://hdl.handle.net/20.500.11937/11674
    Collection
    • Curtin Research Publications
    Abstract

    In the Alps a major extensional shear zone unroofed eclogites in its footwall from 30 kbar to c. 10 kbar, implying of the order of 60 km of relative vertical movement in the period 45-36 Ma. The horizontal component of divergence was of the order of 100 km. We use the foreland basin sedimentary record to prove that the extension was contemporaneous with thrusting in units structurally beneath the eclogites (the Brianconnais and/or External Zones). This thrust-related convergence during that time period was of the order of 44-56 km and therefore of the same order of magnitude as internal zone divergence. Extension may have been driven by internal density contrasts. Buoyant continental crust underneath the mafic eclogites, or dense subducted slab offset from the orogen, can induce extension. Any dynamic model must account for the comparable magnitudes of extension and shortening in adjacent parts of the orogen: relative plate motions in the period 45-36 Ma played a subsidiary role.

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