Reconciling tectonic shortening, sedimentation and spatial patterns of erosion 
from 10Be paleo-erosion rates in the Argentine Precordillera

Val, Pedro; Hoke, Gregory D.; Fosdick, Julie C.; Wittmann, H.

doi:10.1016/j.epsl.2016.06.015

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Reconciling tectonic shortening, sedimentation and spatial patterns of erosion from 10Be paleo-erosion rates in the Argentine Precordillera

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Val, Pedro
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Hoke, Gregory D.
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Fosdick, Julie C.
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Wittmann, H.
3.3 Earth Surface Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Citation

Val, P., Hoke, G. D., Fosdick, J. C., Wittmann, H. (2016): Reconciling tectonic shortening, sedimentation and spatial patterns of erosion from 10Be paleo-erosion rates in the Argentine Precordillera. - Earth and Planetary Science Letters, 450, 173-185.
https://doi.org/10.1016/j.epsl.2016.06.015

Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_1610895

Abstract

The temporal evolution of erosion over million-year timescales is key to understand the development of mountain ranges and adjacent fold-and-thrust belts. While models of orogenic wedge dynamics predict an instantaneous response of erosion to pulses of rock uplift, stream-power based models predict that catchment-wide erosion maxima significantly lag behind a pulse of rock uplift. Here, we explore the relationships between rock uplift, erosion, and sediment deposition in the Argentine Precordillera fold-and-thrust belt at 30°S. Using a combination of 10Be-derived paleo-erosion rates, constraints on re-exposure using 26Al/10Be ratios, geomorphic observations and detrital zircon provenance, we demonstrate that the attainment of maximum upland erosion rates lags the maximum rate of deformation over million-year timescales. The magnitudes and causes of the erosional delays shed new light on the catchment erosional response to tectonic deformation and rock uplift in orogenic wedges.