Topography of mountain belts controlled by rheology and surface processes

Sebastian G. Wolf (), Ritske S. Huismans, Jean Braun and Xiaoping Yuan
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Sebastian G. Wolf: Department of Earth Science, University of Bergen
Ritske S. Huismans: Department of Earth Science, University of Bergen
Jean Braun: German Research Centre for Geosciences
Xiaoping Yuan: German Research Centre for Geosciences

Nature, 2022, vol. 606, issue 7914, 516-521

Abstract: Abstract It is widely recognized that collisional mountain belt topography is generated by crustal thickening and lowered by river bedrock erosion, linking climate and tectonics1–4. However, whether surface processes or lithospheric strength control mountain belt height, shape and longevity remains uncertain. Additionally, how to reconcile high erosion rates in some active orogens with long-term survival of mountain belts for hundreds of millions of years remains enigmatic. Here we investigate mountain belt growth and decay using a new coupled surface process5,6 and mantle-scale tectonic model7. End-member models and the new non-dimensional Beaumont number, Bm, quantify how surface processes and tectonics control the topographic evolution of mountain belts, and enable the definition of three end-member types of growing orogens: type 1, non-steady state, strength controlled (Bm > 0.5); type 2, flux steady state8, strength controlled (Bm ≈ 0.4−0.5); and type 3, flux steady state, erosion controlled (Bm

Date: 2022
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DOI: 10.1038/s41586-022-04700-6

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