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Journal Article

Mantle-driven, climatically modulated landscape evolution in Southern Patagonia

Authors
/persons/resource/milanez

Fernandes,  V. M.
4.6 Geomorphology, 4.0 Geosystems, Departments, GFZ Publication Database, GFZ Helmholtz Centre for Geosciences;

/persons/resource/aruby

Ruby,  Andreas       
4.6 Geomorphology, 4.0 Geosystems, Departments, GFZ Publication Database, GFZ Helmholtz Centre for Geosciences;

/persons/resource/mcnab

McNab,  Fergus       
4.6 Geomorphology, 4.0 Geosystems, Departments, GFZ Publication Database, GFZ Helmholtz Centre for Geosciences;

/persons/resource/wittmann

Wittmann,  H.       
formerly 3.3 Earth Surface Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, GFZ Helmholtz Centre for Geosciences;

/persons/resource/awickert

Wickert,  Andrew
4.6 Geomorphology, 4.0 Geosystems, Departments, GFZ Publication Database, GFZ Helmholtz Centre for Geosciences;

/persons/resource/lgrimm

Grimm,  Lennart
4.6 Geomorphology, 4.0 Geosystems, Departments, GFZ Publication Database, GFZ Helmholtz Centre for Geosciences;

/persons/resource/tschild

Schildgen,  Taylor       
4.6 Geomorphology, 4.0 Geosystems, Departments, GFZ Publication Database, GFZ Helmholtz Centre for Geosciences;

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5038339.pdf
(Publisher version), 6MB

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Citation

Fernandes, V. M., Ruby, A., McNab, F., Wittmann, H., Wickert, A., Grimm, L., Schildgen, T. (2026): Mantle-driven, climatically modulated landscape evolution in Southern Patagonia. - Geology, 54, 117-122.
https://doi.org/10.1130/G53764.1


Cite as: https://gfzpublic.gfz.de/pubman/item/item_5038339
Abstract
We explore the relative importance of tectonic, geodynamic, and surface processes in driving landscape evolution in Argentine Patagonia using 64 new 10Be exposure ages of fluvial terraces preserved over >250 km along the Shehuén and Santa Cruz rivers (50°S). Terrace ages range from 33 ka to 1.5 Ma and coincide with Patagonian glaciations. We demonstrate that landscapes can respond directly to changes in climate forcing driven by the Mid-Pleistocene Transition: our results reveal a transition to 100-k.y. terrace periodicity, and a transient phase of accelerated incision starting at ca. 1 Ma. A regionally uniform incision rate of 130–180 m Ma−1 since 1 Ma suggests uplift linked to asthenospheric heating in the Patagonian slab window, while transient accelerated incision suggests convective instabilities in a low-viscosity mantle. We establish a temporal link between climate oscillations, fluvial incision, and mantle-driven epeirogenic uplift.