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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. ; Roller, S. ; Walter, J. M. ; Jansen, E. ; 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), 96 (2), pp. 229-252. SpringerLink, ISSN 1437-3254 (Print) 1437-3262 (Online),
[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. ; Roller, S. ; Walter, J. M. ; Jansen, E. ; 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)
Journal Volume: 96
Issue 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
URL / URN: 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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