The Chironico landslide (Valle Leventina, southern Swiss Alps): age and evolution

详细信息    查看全文

• 作者：Anne Claude (1) (5)
  Susan Ivy-Ochs (2) (3)
  Florian Kober (1) (6)
  Marco Antognini (4)
  Bernhard Salcher (1) (7)
  Peter W. Kubik (2)
  
• 关键词：Switzerland ; Canton ticino ; Surface exposure dating ; Cosmogenic nuclides (10Be ; 36Cl) ; Landslide modelling
• 刊名：Swiss Journal of Geosciences
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：107
• 期：2-3
• 页码：273-291
• 全文大小：16,159 KB
• 参考文献：1. Abele, G. (1974). / Bergstürze in den Alpen, ihre Verbreitung, Morphologie und Folgeerscheinungen (230?pp). Wissenschaftliche Alpenvereinshefte, 25, München.
  2. Ak?ar, N., Deline, P., Ivy-Ochs, S., Alfimov, V., Hajdas, I., Kubik, P. W., et al. (2012). The AD 1717 rock avalanche deposits in the upper Ferret Valley (Italy): A dating approach with cosmogenic ¹⁰Be. / Journal of Quaternary Science, / 27(4), 383-92. CrossRef
  3. Alfimov, V., & Ivy-Ochs, S. (2009). How well do we understand the production of ³⁶Cl in limestone and dolomite? / Quaternary Geochronology, / 4, 462-74. CrossRef
  4. Ambrosi, C., & Crosta, G. B. (2011). Valley shape influence on deformation mechanisms of rock slopes. / Geological Society London Special Publications, / 351, 215-33. CrossRef
  5. Antognini, M., & Volpers, R. (2002). A late Pleistocene age for the Chironico rockslide (Central Alps, Ticino, Switzerland). / Bulletin for Applied Geology, / 7(2), 113-25.
  6. Balco, G., Briner, J., Finkel, R. C., Rayburn, J. A., Ridge, J. C., & Schaefer, J. M. (2009). Regional beryllium-10 production rate calibration for northeastern North America. / Quaternary Geochronology, / 4, 93-07. CrossRef
  7. Balco, G., Stone, J. O., Lifton, N. A., & Dunai, T. J. (2008). A complete and easily accessible means of calculating surface exposure ages or erosion rates from Be-10 and Al-26 measurements. / Quaternary Geochronology, / 3, 174-95. CrossRef
  8. Ballantyne, C. K., Sandeman, G. F., Stone, J. O., & Wilson, P. (2014a). Rock-slope failure following Late Pleistocene deglaciation on tectonically stable mountainous terrain. / Quaternary Science Reviews, / 86, 144-57. CrossRef
  9. Ballantyne, C. K., Wilson, P., Gheorghiu, D., & Rodes, A. (2014b). Enhanced rock-slope failure following ice-sheet deglaciation: Timing and causes. / Earth Surface Processes and Landforms, / 39, 900-13. CrossRef
  10. Ballantyne, C. K., Wilson, P., Schnabel, C., & Xu, S. (2013). Lateglacial rock slope failures in north-west Ireland: Age, causes and implications. / Journal of Quaternary Science, / 28(8), 789-02. CrossRef
  11. Bini, A., Buoncristiani, J. -F., Couterrand, S., Ellwanger, D., Felber, M., Florineth, D., Graf, H. R., Keller, O., Kelly, M., Schlüchter, C., Schoeneich, P. (2009). / Die Schweiz w?hrend des letzteiszeitlichen Maximums (LGM), 1:500 000. Federal Office of Topography, swisstopo. Wabern, Switzerland.
  12. Borgatti, L., & Soldati, M. (2010). Landslides as a geomorphological proxy for climate change: A record from the Dolomites (northern Italy). / Geomorphology, / 120, 56-3. CrossRef
  13. Briner, J. P., Young, N. E., Goehring, B. M., & Schaefer, J. M. (2012). Constraining Holocene ¹⁰Be production rates in Greenland. / Journal of Quaternary Science, / 27(1), 2-. CrossRef
  14. Bronk Ramsey, C. (2008). Deposition models for chronological records. / Quaternary Science Reviews, / 27(1-), 42-0. CrossRef
  15. Brückl, E., Brückl, J., & Heuberger, H. (2001). Present structure and prefailure topography of the giant rockslide K?fels. / Zeitschrift für Gletscherkunde und Glazialgeologie, / 37, 49-9.
  16. Casasopra, S. (1939). Studio petrografico dello Gneiss granitico Leventina (Valle Riviera e Valle Leventina, Canton Ticino). / Schweizerische Mineralogische und Petrographische Mitteilungen, / 19, 449-09.
  17. Chmeleff, J., von Blanckenburg, F., Kossert, K., & Jakob, D. (2010). Determination of the ¹⁰Be half-life by multicollector ICP-MS and liquid scintillation counting. / Nucle
• 作者单位：Anne Claude (1) (5)
  Susan Ivy-Ochs (2) (3)
  Florian Kober (1) (6)
  Marco Antognini (4)
  Bernhard Salcher (1) (7)
  Peter W. Kubik (2)
  
  1. Geological Institute, ETH Zurich, Sonneggstrasse 5, 8092, Zurich, Switzerland
  5. Institute of Geological Sciences, University of Bern, Baltzerstrasse 1-3, 3012, Bern, Switzerland
  2. Laboratory of Ion Beam Physics (LIP), ETH Zurich, Otto-Stern-Weg 5, 8093, Zurich, Switzerland
  3. Department of Geography, University of Zurich, Winterthurerstrasse 190, 8057, Zurich, Switzerland
  6. Nagra, Hardstrasse 73, Postfach 280, 5430, Wettingen, Switzerland
  4. Museo Cantonale di storia naturale, Viale Cattaneo 4, 6900, Lugano, Switzerland
  7. Department of Geography and Geology, Salzburg University, Hellbrunner Strasse 34, 5020, Salzburg, Austria
  
• ISSN：1661-8734

文摘

In this study, we focus on the postglacial Chironico landslide in Valle Leventina, the valley of the Ticino river immediately south of the Gotthard pass (southern Swiss Alps). At Chironico, 530 million?m3 of granite gneiss detached from the eastern wall of Valle Leventina and slid along valley-ward dipping foliation joints and fractures. The slide mass was deposited into the valley bottom and blocked the Ticino river, as well as a tributary, the Ticinetto stream, on the opposite side of the valley. Wood fragments found in lacustrine sediments in the slide-dammed upstream lake were previously dated, yielding a minimum age for the landslide of approximately 13,500?cal?years BP. Based on the deposit morphology, the landslide was in the past interpreted as being composed of two events. In order to directly date the landslide, ten boulders were dated using the cosmogenic nuclides 10Be and 36Cl. Mean exposure ages indicate that the landslide occurred at 13.38?±?1.03?ka BP, during the B?lling-Aller?d interstadial. This implies that the Chironico landslide, one of the few pre-Holocene slides known in Alps, is also the oldest in crystalline rock. With runout modelling using DAN3D we could reproduce the hypothesized single-event failure scenario, as well as the character and extent of motion of the landslide mass. Both the ages and the modelling suggest that the landslide was released in one event around 3,000?years following deglaciation.