Skip to Main content Skip to Navigation
Poster communications

Stratigraphic signature of lithospheric deformation style in post-rift passive margin basins

Abstract : We revise commonly accepted models explaining long-term stratigraphic trends along Atlantic-type passive margins by including the impact of complex lithosphere deformation at depth and it’s coupling with surface processes. To achieve this, we simulated the evolution of a passive margin basin using a cascade of three modeling tools: a thermo-mechanical model of the syn-rift stretching of the lithosphere, a flexural and thermal model of the post-rift stage that includes coupling with surface processes and, finally, a stratigraphic model of the associated sedimentary basin architecture. We compare two necking styles that lead to different margin geometries: wide and narrow margins that form by heterogeneous stretching. Wide margins, forming thinner and wider sedimentary wedges, show significantly larger aggradation component and longer preservation duration, in more continental/proximal depositional facies. Narrow margins are characterized by enhanced erosion and by-pass during transgression. Through a parametric analysis we constrain the relative contribution of lithosphere deformation and surface processes on the stratigraphic trends and show that both may contribute equally to the stratigraphic architecture. For example, enhanced erosion in narrow margins impacts the volume of sediments delivered to the basin, which, in turn, significantly increases the subsidence. Our simulations also underline the importance of the assumed sediment transport length, which controls whether the main depocentres remain in the necking zone or reach the more distal parts of the margin.
Document type :
Poster communications
Complete list of metadatas

https://hal-insu.archives-ouvertes.fr/insu-01309453
Contributor : Isabelle Dubigeon <>
Submitted on : Friday, April 29, 2016 - 3:20:03 PM
Last modification on : Friday, November 20, 2020 - 4:22:03 PM

Identifiers

  • HAL Id : insu-01309453, version 1

Citation

Delphine Rouby, Ritske Huismans, Cécile Robin, Jean Braun, Didier Granjeon. Stratigraphic signature of lithospheric deformation style in post-rift passive margin basins. European Geosciences Union General Assembly 2016, Apr 2016, Vienne, Austria. Geophysical Research Abstracts, 18, pp.EGU2016-4920, 2016. ⟨insu-01309453⟩

Share

Metrics

Record views

335