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| Titel |
Numerical modeling of sedimentation controls on the growth of the fold-and-thrust belts |
| VerfasserIn |
Charlotte Fillon, Ritske S. Huismans, Peter van der Beek |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250078129
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| Zusammenfassung |
| The main objective of this study is to understand the coupling between tectonics and surface processes during formation of a thin-skinned fold-and-thrust belt. We focus on the controls of syn-orogenic sedimentation on thrust development during wedge building. We use an Arbitrary Lagrangian Eulerian finite-element model (Sopale) to model the thin-skinned fold-and-thrust belt at upper crustal scales (7 km depth and 200 km length). Sopale takes into account the main features and processes that influence the development of a fold-and-thrust belt including detachment horizons, strain-softening, flexural isostasy, and erosion and sedimentation processes. Initial, more conceptual modeling focuses on wedge development coupled with syn-orogenic sedimentation. Wedge-top sedimentation directly affects the taper angle and clearly modifies the behavior of the wedge; a clear relationship between average thrust-sheet length and the thickness of syn-tectonic sediments is highlighted. Subsequently, a sediment cover that progrades towards the foreland with time is added to reproduce the late syn-orogenic burial of the southern Pyrenean fold-and-thrust belt by conglomerates and demonstrate that wedge top sedimentation can explain the out-of-sequence thrust belt activity in the southern central Pyrenees. |
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