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Part II: Applied thermochronology - long-term evolution studies |
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1 University of Tübingen, Institute of Geosciences, Sigwartstrasse 10, D-72076 Tübingen, Germany
2 Subatomic Physics Department, Van de Graaff Laboratory, Utrecht University, P.O. Box 80.000, 3508 TA Utrecht, The Netherlands
* Corresponding author (e-mail: kuhlemann{at}uni-tuebingen.de)
In situ10 Be concentrations in granites on Corsica (Mediterranean), exposed to subalpine climate, yield weathering rates of between 9 and 20 mm ka–1, when averaged over the last 30–100 ka. Weathering rates rise with increasing precipitation and brittle deformation. Thermal history modelling of apatite fission-track (AFT) data confirms that average denudation rates of 5–20 mm ka–1 were typical during the Neogene. Short- and long-term denudation rates are in the same range and indicate that a late Neogene global increase in denudation rates has probably not affected geomorphically stable uplifted palaeosurfaces of hilly to low mountainous local relief. A Southwards decrease in short- and long-term denudation rates indicate a linear relationship with decreasing precipitation. Post-glacial downwearing of moraine matrix, as constrained by soil-derived humic etching of dated glacial boulders, yields 40–140 mm ka–1, which indicates a poor preservation potential of moraines older than the last glaciation. This weathering rate is of the order of 3 times faster than that found for long-term regolith formation from granites based on of geomorphic evidence.
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  F. Lisker, B. Ventura, and U. A. Glasmacher Apatite thermochronology in modern geology Geological Society, London, Special Publications, 2009; 324: 1 - 23. [Abstract] [Full Text] [PDF]
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