3D finite amplitude folding: Implications for stress evolution during crustal and lithospheric deformation

Details 3D finite amplitude folding: Implications for stress evolution during crustal and lithospheric deformation 3D finite amplitude folding: Implications for stress evolution during crustal and lithospheric deformation

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3314309k&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 14, CiteID L14309

Physics

Geophysics

10

Mathematical Geophysics: Instability Analysis, Structural Geology: Folds And Folding, Structural Geology: Mechanics, Theory, And Modeling, Tectonophysics: Continental Tectonics: Extensional (0905)

Scientific paper

Compression of the lithosphere, sedimentary sequences or quartz veins may result in a folding instability. We perform numerical simulations of viscous single-layer folding to study this instability in 3D. It is demonstrated that linear theories correctly describe the instability for small amplitudes. At larger amplitudes, however, the theory breaks down. For these stages we present a new nonlinear amplification equation. Numerical simulations of folding of an initially horizontal layer, perturbed with random noise, demonstrate that in most cases fold axes form perpendicular to the main shortening direction. Aspect ratios of folds are finite and the patterns are relatively insensitive to the applied background shortening directions. Furthermore, the 3D folding instability reduces the averaged differential stress within the folded (``strong'') layer, in agreement with 2D results. This implies that the Christmas-tree approach to represent the strength of the crust and lithosphere may be invalid if folding occurs during the deformation.

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