Dating cave sediments


Initially developed to date periods of surface denudation and incision, the cosmogenic nuclide method was later adapted for dating mountain cave deposits, first by Granger (Granger , 1997, 2001) in the USA, and then by P. This method was tested for the first time in France in 2005, at Mount Granier, in the sub-alpine Chartreuse Mountains.

The tests were carried out as part of a larger, international research project on alpine cave genesis.

To overcome this limitation, karst scientists in the Alps have applied a number of other approaches.

At first these approaches focused on relative dating methods such as palaeomagnetism (Audra and Rochette, 1993; Hobléa, 1999a) and palynology (Hobléa, 1999a); however, the development of cosmogenic nuclide methods applied to geomorphology in 1990s (Siame 2005), especially those shown to be older than the limits of the U/Th dating method on speleothems. Granger (Haüselmann and Granger, 2004, 2005), in Europe.

Granier is a perched half-syncline that runs from an altitude of 1933 m on the western crest, to 1578 m at the summit of the eastern rim, from where the truncated synclinal trough can be seen (fig. Having lost its eastern flank, the synclinal plateau slopes east towards the Isère Valley (Grésivaudan), following the 10° to 15° dip of its constituent Neocomian series, which is crowned by a 200-m thick sequence of Urgonian limestone (a large part of the Upper Urgonian has been removed by erosion). Granier, which was formed by a huge landslide in 1248, overlooks the Chambéry-Montmélian valley, which divides the Chartreuse from the Bauges Mountains.plateau that is elongated along its central axis.