Climate and Erosion; Cosmogenic nuclides; OSL dating; Western Andes of Peru and Northern Chile; Erosion through time
Savi S. et al. (2014), Effects of sediment mixing on Be-10 concentrations in the Zielbach catchment, central-eastern Italian Alps, in Quaternary Geochronology
, 19, 148-162.
Bekaddour T. et la. (2014), Paleo erosion rates and climate shifts recorded by Quaternary cut-and-fill sequences in the Pisco valley, central Peru, in Earth and Planetary Science Letters
, 390, 103-115.
Savi S. et al. (2014), Quantifying sediment supply at the end of the last glaciation: Dynamic reconstruction of an alpine debris-flow fan, in Geological Society of America Bulletin
, 126, 773-790.
Trauerstein M. et al. (2014), Small aliquot and single grain IRSL and post-IR IRSL dating of fluvial and alluvial sediments from the Pativilca valley, Peru, in QUATERNARY GEOCHRONOLOGY
, 22, 163-174.
Delunel R. et al. (2014), Snow shielding factors for cosmogenic nuclide dating inferred from long-term neutron detector monitoring, in QUATERNARY GEOCHRONOLOGY
, 24, 16-26.
Caduff R. et al. (2014), Terrestrial Radar Interferometric Measurement of Hillslope Deformation and Atmospheric Disturbances in the Illgraben Debris-Flow Catchment, Switzerland, in IEEE Geoscience and Remote Sensing Letters
, 11, 434-438.
Chittenden H. et al. (2014), The influence of bedrock orientation on the landscape evolution, surface morphology and denudation (Be-10) at the Niesen, Switzerland, in Earth Surface Processes and Landforms
, 39, 1153-1166.
Baran R. Friedrich A. Schlunegger F. (2014), The late Miocene to Holocene erosion pattern of the Alpine foreland basin reflects Eurasian slab unloading beneath the western Alps rather than global climate change, in Lithosphere
, 6, 124-131.
Norton K.P. Molnar P. Schlunegger F. (2014), The role of climate-driven chemical weathering on soil production, in Geomorphology
, 204, 510-517.
Delunel R. et al. (2014), Transient sediment supply in a high-altitude Alpine environment evidenced through a 10Be budget of the Etages catchment (French Western Alps), in Earth Surface Processes and Landforms
, 39, 890-899.
Föllmi K. Schlunegger F. Weissert H. (2013), Alpine Sedimentology: An introduction and tribute to Albert Matter and Daniel Bernoulli, in Sedimentology
, 60, 1-18.
Trauerstein M. Norton K.P. Preusser F. Schlunegger F. (2013), Climatic imprint on landscape morphology in the western escarpment of the Andes, in Geomorphology
, 194, 76-83.
Savi S. Schneuwly-Bollschweiler M. Bommer-Denns B. Stoffel M. Schlunegger F. (2013), Geomorphic coupling between hillslopes and channels in the Swiss Alps, in Earth Surface Processes and Landforms
, 38, 959-969.
Schlunegger F. Norton K.P. (2013), Headward retreat of streams in the Late Oligocene to Early Miocene Swiss Alps, in Sedimentology
, 60, 85-101.
Schlunegger F. Norton K.P. Caduff R. (2013), Hillslope Processes in Temperate Environments
, Academic Press, San Diego.
Dürst Stuck M. Schlunegger F. (2013), Identification of erosional mechanisms during past glaciations based on a bedrock surface model of the central European Alps, in Earth and Planetary Science Letters
, 384, 57-70.
Bennett G. Molnar P. McArdell B.W. Schlunegger F. Burlando P. (2013), Patterns and controls of sediment production, transfer and yield in the Illgraben, in Geomorphology
, 188, 68-82.
Hinderer M. Kastowski M. Kamelger A. Bartolini C. Schlunegger F. (2013), River loads and modern denudation of the Alps — A review, in Earth Science Reviews
, 118, 11-44.
Schlunegger F. Norton K.P. (2013), Water versus ice: The competing roles of modern climate and Pleistocene glacial erosion in the Central Alps of Switzerland, in Tectonophysics
, 602, 370-381.
Trauerstein M., Lowick S., Preusser F., Rufer D., Schlunegger F. (2012), Exploring fading in single grain feldspar IRSL measurements, in Quaternary Geochronology
, 10, 327-333.
Bekaddour T., Schlunegger F., Attal M., Norton K.P., Lateral sediment sources and knickzones as controls on spatio-temporal variations of sediment transport in an Alpine river, in Sedimentology
, 60, 342-357.
This proposal seeks for funding to continue the research tasks for project 200020-121680 where we aim to (i) quantify denudation in response to precipitation rates, and to (ii) explore the relationships between erosion and climate for orbital to My time scales on the western Peruvian margin. These scopes are organized into three closely related projects (I-III). Project I addresses the spatial relationships between denudation and precipitation in the Western Andean Escarpment of Peru. This will be investigated based on reconstructions of N-S trends of (i) optically stimulated luminescence (OSL) age and thickness of cut-and-fill terrace systems (ongoing PhD project A of M. Trauerstein) and (ii) 10Be-based erosion rates of bedrock (in-situ 10Be) and soil (meteoric 10Be) (follow-up PhD project B). OSL ages will be measured for cut-and-fill terrace systems along the Peruvian coast where preliminary analyses revealed correlations to orbital shifts of the Andean Jet. We plan to test whether terrace deposits are thickest (exceeding 50 m) near the leading edge of the Andean Jet as suggested by our previous studies. The reconstruction of relationships between N-S precipitation gradients and bedrock and soil erosion, which is the focus of the follow-up project starting in April 2013, will be established by the analyses of bedload samples for in-situ 10Be collected from rivers along the Peruvian coast, and by the measurements of suspension loads for meteoric 10Be collected from the identical streams. This task will be complemented by determination of the weathering and organic carbon flux from these basins using suspended and dissolved load chemistry.Project II focuses on the temporal relationships between denudation and precipitation. We plan to explore how orbital and longer shifts in precipitation rates have influenced surface erosion. These relationships will be established based on (i) 10Be-based denudation rates measured for orbital time scales (ongoing PhD project C of T. Bekkadour), and (ii) paired 26Al/10Be, 21Ne/10Be as well as 21Ne/3He concentrations of older deposits, possibly as far back in time as the 20 Ma (follow-up PhD project D). T. Bekkadour is currently measuring orbital changes in paleo-denudation rates for dated terrace deposits in the Pisco valley. Likewise, he will quantify the relationships between bedrock weathering rates, temperature, and precipitation rate gradients for soil samples, as these mechanisms have modified the production of sediment through time. The follow-up PhD project, starting in January 2014, will first improve the chronological framework of Plio-Pleistocene conglomerate deposits with sources in the Western Cordillera using10Be/26Al burial ages, and then calculate paleo-denudation rates from these units using multiple cosmogenic nuclides. The final task focuses on the extension of the paleo-denudation rate measurements back in time, potentially to 20 Ma, with multiple stable nuclides. Project III focuses on the improvement of the method by establishing a new set of inter-nuclide calibration data that will greatly improve the precision for the PhD projects. We intend to determine accurate scaling factors of production rates with altitude and latitude for western South America as well as to investigate the influence of variations in Earth's magnetic field on nuclide production rates through the Pleistocene. To that extend, we will measure concentrations of 26Al/10Be, 21Ne/10Be as well as 21Ne/3He for eroded surfaces between the Pacific and the Altiplano of northern Chile, and for non-eroded, but dated volcanic surfaces on the Altiplano of northern Chile as far south as 35°. Finally, a major task will be the calibration of the new Time-of-Flight noble gas mass spectrometer for the Andean samples. The new instrument, located at the Physical Institute, will provide the required sensitivity to accurately measure the small gas amounts expected here. Thus, project III prepares the intellectual and methodological framework to measure paleo-erosion rates further back in time is thus designed for a PostDoc.