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Luminescence dating of a gigantic palaeolandslide in the Gobi-Altay mountains, Mongolia |
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| Authors: | S Balescu J-F Ritz M Lamothe M Auclair M Todbileg |
| Institution: | aLaboratoire de Préhistoire et Quaternaire (UMR 8018), Université des Sciences et Technologies de Lille, avenue Paul Langevin, 59655 Villeneuve d’Ascq Cedex, France bLaboratoire Dynamique de la Lithosphère (UMR 5573), Université de Montpellier II, Place Eugène Bataillon, 34095 Montpellier Cedex 05, France cDépartement des Sciences de la Terre et de l’Atmosphère, Université du Québec à Montréal, Montréal, H3C 3P8 Canada dSchool of Geology, Mongolian University of Science and Technology, Baga Tolruu-34 , P.O. Box-520, Ulaanbaatar 210646, Mongolia |
| Abstract: | In an attempt to date a palaeolandslide that took place along the Baga Bogd Massif, in Mongolia, the infrared stimulated luminescence (IRSL) method has been applied to lacustrine silty sediments directly overlying the landslide mass. The IRSL age estimates obtained on alkali feldspar grains (>40 μm) and polymineral fine grains (4–11 μm) provide a minimum age for the landslide event. The IRSL ages on alkali feldspars corrected for long-term fading using the protocol of Mejdahl (1988, 1989) suggest that the palaeolandslide occurred at the beginning of the Last Interglacial. These are in good agreement with the 10Be cosmogenic dates obtained on faulted and abandoned alluvial fans in the Gobi-Altay mountains. This study demonstrates for the first time that the IRSL dating method can successfully be applied for establishing landslide chronologies. |
| Keywords: | Luminescence dating Palaecolandslide Mongolia Pleistocene |
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