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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