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Structural evolution of the contact between two Penninic nappes (Zermatt-Saas zone and Combin zone, Western Alps) and implications for the exhumation mechanism and palaeogeography

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An Erratum to this article was published on 05 July 2007

Abstract

The boundary zone between two Penninic nappes, the eclogite-facies to ultrahigh-pressure Zermatt-Saas zone in the footwall and the blueschist-facies Combin zone in the hanging wall, has been interpreted previously as a major normal fault reflecting synorogenic crustal extension. Quartz textures of mylonites from this fault were measured using neutron diffraction. Together with structural field observations, the data allow a refined reconstruction of the kinematic evolution of the Pennine nappes. The main results are: (1) the contact is not a normal fault but a major thrust towards northwest which was only later overprinted by southeast-directed normal faulting; (2) exhumation of the footwall rocks did not occur during crustal extension but during crustal shortening; (3) the Sesia-Dent Blanche nappe system originated from a continental fragment (Cervinia) in the Alpine Tethys ocean, and the Combin zone ophiolites from the ocean basin southeast of Cervinia; (4) out-of-sequence thrusting played a major role in the tectonic evolution of the Penninic nappes.

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Acknowledgments

This article benefited from comments and suggestions of the reviewers Giancarlo Molli and Neil Mancktelow, which are gratefully acknowledged. Supported by DFG (grant no. FR700/6).

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  1. Geologisches Institut, Universität Bonn, Nußallee 8, 53115, Bonn, Germany

    Jan Pleuger, Sybille Roller & Nikolaus Froitzheim

  2. Mineralogisch-Petrologisches Institut, Universität Bonn, Außenstelle für Neutronenbeugung im Forschungszentrum Jülich, MIN/ZFR, 52425, Jülich, Germany

    Jens M. Walter & Ekkehard Jansen

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  1. Jan Pleuger
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An erratum to this article can be found at http://dx.doi.org/10.1007/s00531-007-0197-8

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Pleuger, J., Roller, S., Walter, J.M. et al. Structural evolution of the contact between two Penninic nappes (Zermatt-Saas zone and Combin zone, Western Alps) and implications for the exhumation mechanism and palaeogeography. Int J Earth Sci (Geol Rundsch) 96, 229–252 (2007). https://doi.org/10.1007/s00531-006-0106-6

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