TY - JOUR
T1 - Reconciling tectonic shortening, sedimentation and spatial patterns of erosion from 10Be paleo-erosion rates in the Argentine Precordillera
AU - Val, Pedro
AU - Hoke, Gregory D.
AU - Fosdick, Julie C.
AU - Wittmann, Hella
N1 - Funding Information:
We thank: 1) the donors of the American Chemical Society Petroleum Research Fund for support of this research (award 52480-DNI8 to G. Hoke); 2) CAPES/Science Without Borders (Brazilian Government) for a Doctoral Fellowship to P. Val (Project # 0515-12-4 ); 3) U.S. National Science Foundation for funds to support U–Pb geochronology (Award EAR-1049605 to J. Fosdick); 4) T. Jordan and B. Ruskin for providing detailed stratigraphic section locations; 5) H. Canelo and G. Ortiz for field support; 6) C. Schulz and J. Bartel for laboratory support at GFZ; 7) B. Wilkinson and D. McPhillips for insightful discussions. We are grateful to P. Bierman, B. Fisher, D. Granger and three anonymous reviewers for constructive comments on the manuscript as it evolved.
Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2016/9/15
Y1 - 2016/9/15
N2 - 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.
AB - 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.
KW - Andes
KW - Be paleo-erosion rates
KW - compressional mountain range
KW - detrital zircon provenance
KW - rock uplift
KW - time-lag
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U2 - 10.1016/j.epsl.2016.06.015
DO - 10.1016/j.epsl.2016.06.015
M3 - Article
AN - SCOPUS:84978168207
SN - 0012-821X
VL - 450
SP - 173
EP - 185
JO - Earth and Planetary Sciences Letters
JF - Earth and Planetary Sciences Letters
ER -