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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

Pleuger, J. and Roller, S. and Walter, J. M. and Jansen, E. and Froitzheim, N. (2007):
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.
In: International Journal of Earth Sciences (Geologische Rundschau), SpringerLink, pp. 229-252, 96, (2), ISSN 1437-3254 (Print) 1437-3262 (Online), [Online-Edition: http://www.springerlink.com/content/e2610760582xj262/?p=316f...],
[Article]

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.

Item Type: Article
Erschienen: 2007
Creators: Pleuger, J. and Roller, S. and Walter, J. M. and Jansen, E. and Froitzheim, N.
Title: 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
Language: English
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.

Journal or Publication Title: International Journal of Earth Sciences (Geologische Rundschau)
Volume: 96
Number: 2
Publisher: SpringerLink
Uncontrolled Keywords: Alps Tectonics Exhumation Palaeogeography Quartz Texture
Divisions: 11 Department of Materials and Earth Sciences > Earth Science > Applied Sedimentary Geology
11 Department of Materials and Earth Sciences > Earth Science
11 Department of Materials and Earth Sciences
Date Deposited: 28 Jan 2010 13:12
Official URL: http://www.springerlink.com/content/e2610760582xj262/?p=316f...
Additional Information:

Published online: 12 July 2006 An erratum to this article can be found at http://dx.doi.org/10.1007/s00531-007-0197-8 (Vol.96/6, pp. 1211-1212)

Identification Number: doi:10.1007/s00531-006-0106-6
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