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| Titel |
Viscous overthrusting versus folding: 2-D quantitative modeling and its application to the Helvetic and Jura fold and thrust belts |
| VerfasserIn |
Yoann Jaquet, Arthur Bauville, Stefan M. Schmalholz |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250088649
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| Publikation (Nr.) |
 EGU/EGU2014-2786.pdf |
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| Zusammenfassung |
| We apply a viscous model to study the tectonic evolution of the Jura and Helvetic
fold-and-thrust belts of the European Alps. We present two-dimensional (2-D) numerical
simulations of the shortening of a stiff viscous layer, with a pre-existing weak zone,
that is embedded in a weaker viscous matrix. The model bottom remains straight
during shortening and represents a detachment surface. Four deformation styles
are observed that depend on the ratio of the layer and matrix viscosities, μL/μM;
the thickness ratio of the bottom matrix and the overlying stiff layer, HM-HL;
and the power-law stress exponent of the matrix, nM. The numerical results are
used to quantify the conditions for which each deformation style occurs: (1) pure
shear-dominated deformation occurs for μL/μM ~50 and HM-HL ~50, and HM-HL >~1; and (4) folding and overthrusting occur for a power-law
viscous matrix and ~0.5< HM-HL |
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