TY  - JOUR
A1  - Hippe, Kristina
A1  - Kober, Florian
A1  - Zeilinger, Gerald
A1  - Ivy-Ochs, Susan
A1  - Kubik, Peter W.
A1  - Wieler, Rainer
T1  - Short and long-term denudation rates at the Altiplano margin, La Paz region, Bolivia
Y1  - 2009
UR  - http://www.sciencedirect.com/science/journal/00167037
U6  - https://doi.org/10.1016/j.gca.2009.05.006
SN  - 0016-7037
ER  - 
TY  - JOUR
A1  - Kober, Florian
A1  - Ivy-Ochs, Susan
A1  - Zeilinger, Gerald
A1  - Schlunegger, Fritz
A1  - Kubik, Peter W.
A1  - Baur, Heinrich
A1  - Wieler, Rainer
T1  - Complex multiple cosmogenic nuclide concentration and histories in the arid Rio Lluta catchment, northern Chile
N2  - Terrestrial cosmogenic nuclide (TCN) concentrations measured in river sediments can be used to estimate catchment-wide denudation rates. By investigating multiple TCN the steadiness of sediment generation, transport and depositional processes can be tested. Measurements of Be-10, Ne-21 and Al-26 from the hyper- to semi-arid Rio Lluta catchment, northern Chile, yield average single denudation rates ranging from 12 to 75 m Myr(-1) throughout the catchment. Paired nuclide analysis reveals complex exposure histories for most of the samples and thus the single nuclide estimates do not exclusively represent catchment-wide denudation rates. The lower range of single nuclide denudation rates (12-17 m Myr(-1)), established with the noble gas Ne-21, is in accordance with palaeodenudation rates derived from Ne-21/Be-10 and Al-26/Be-10 ratio analysis. Since this denudation rate range is measured throughout the system, it is suggested that a headwater signal is transported downstream but modulated by a complex admixture of sediment that has been stored and buried at proximal hillslope or terrace deposits, which are released during high discharge events. That is best evidenced by the stable nuclide Ne-21, which preserves the nuclide concentration even during storage intervals. The catchment-wide single Ne-21 denudation rates and the palaeodenuation rates contrast with previous TCN-derived erosion rates from bedrock exposures at hillslope interfluves by being at least one order of magnitude higher, especially in the lower river course. These results support earlier studies that identified a coupling of erosional processes in the Western Cordillera contrasting with decoupled processes in the Western Escarpment and in the Coastal Cordillera.
Y1  - 2009
UR  - http://onlinelibrary.wiley.com/journal/10.1002/%28ISSN%291096-9837
U6  - https://doi.org/10.1002/Esp.1748
SN  - 0197-9337
ER  -