Links Between Faulting, Topography, and Sediment Production During Continental Rifting: Insights From Coupled Surface Process, Thermomechanical Modeling - Archive ouverte HAL Access content directly
Journal Articles Journal of Geophysical Research : Solid Earth Year : 2022

Links Between Faulting, Topography, and Sediment Production During Continental Rifting: Insights From Coupled Surface Process, Thermomechanical Modeling

, , (1) , ,
1
Lorenz Wolf
  • Function : Author
Ritske S. Huismans
  • Function : Author
Robert L. Gawthorpe
  • Function : Author
Sebastian G. Wolf
  • Function : Author

Abstract

Continental rifts form by extension, and their subsequent evolution depends on the tectonic and climatic boundary conditions. We investigate how faulting, topography, and the evolution of the sediment flux during rifting are affected by these boundary conditions, in particular whether it is possible to correlate tectonic activity, topography, and sediment flux on long timescales (40 Myr). We use a thermomechanical model coupled with a landscape evolution model and present a series of 14 models, testing the sensitivity of the models to crustal strength, extension rate, and fluvial erodibility. The degree of strain localization drives the structural evolution of the modeled rifts: slow extension, high crustal strength, and efficient surface processes promote a high degree of strain localization, resulting in fewer active faults with larger offset. Overall, the magnitude of sediment production correlates with the degree of strain localization. In case of unchanged erosional power and similar amount of extension, systems with slower extension produce more sediment owing to a stronger positive feedback between erosion and fault offset. We observe a characteristic sequence of events, reflecting the morpho-tectonic evolution of rifts: the highest rock uplift rates are observed before the maximum elevation, and the highest sediment flux postdates the peak in elevation. Our results indicate that for natural systems, the evolution of the sediment flux is a good proxy for the evolution of topography, and that a time lag of 2-5 Myr between the peaks in main tectonic activity and sediment flux can exist.
Fichier principal
Vignette du fichier
JGR Solid Earth - 2022 - Wolf - Links Between Faulting Topography and Sediment Production During Continental Rifting .pdf (21.29 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

insu-03747056 , version 1 (07-05-2022)
insu-03747056 , version 2 (07-08-2022)

Licence

Attribution - CC BY 4.0

Identifiers

Cite

Lorenz Wolf, Ritske S. Huismans, Delphine Rouby, Robert L. Gawthorpe, Sebastian G. Wolf. Links Between Faulting, Topography, and Sediment Production During Continental Rifting: Insights From Coupled Surface Process, Thermomechanical Modeling. Journal of Geophysical Research : Solid Earth, 2022, 127, ⟨10.1029/2021JB023490⟩. ⟨insu-03747056v1⟩
15 View
8 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More