Environmental controls on 10Be‐based catchment‐averaged denudation rates along the western margin of the Peruvian Andes

Environmental controls on 10Be‐based catchment‐averaged denudation rates along the western margin of the Peruvian Andes

We present 10Be‐based basin‐averaged denudation rates for the entire western margin of the Peruvian Andes. Denudation rates range from c. 9 mm ka−1 to 190 mm ka−1 and are related neither to the subduction of the Nazca plate nor to the current seismicity along the Pacific coast and the occurrence of...

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Bibliographic Details
Published in:Terra nova (Oxford, England) Vol. 29; no. 5; pp. 282 - 293
Main Authors: Reber, Regina, Delunel, Romain, Schlunegger, Fritz, Litty, Camille, Madella, Andrea, Akçar, Naki, Christl, Marcus
Format: Journal Article
Language:English
Published: Oxford Blackwell Publishing Ltd 01-10-2017
Subjects:
Basins
Beryllium 10
Catchment area
Catchments
Denudation
Environmental control
Erosion
Erosion rates
Quaternary
Subduction
Terraces
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Summary:We present 10Be‐based basin‐averaged denudation rates for the entire western margin of the Peruvian Andes. Denudation rates range from c. 9 mm ka−1 to 190 mm ka−1 and are related neither to the subduction of the Nazca plate nor to the current seismicity along the Pacific coast and the occurrence of raised Quaternary marine terraces. Therefore, we exclude a tectonic control on denudation on a millennial time‐scale. Instead, we explain >60% of the observed denudation rates with a model where erosion rates increase either with mean basin slope angles or with mean annual water discharge. These relationships suggest a strong environmental control on denudation.
ISSN:0954-4879
1365-3121
DOI:10.1111/ter.12274