Orogeny through time by Jean-Pierre Burg, Mary Ford, Geological Society of London

By Jean-Pierre Burg, Mary Ford, Geological Society of London

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In general, the first-order predictions of rheological studies are confirmed by geophysical observation, although one should be aware of the highly inhomogeneous distribution of deformation in the lower crust mentioned in the previous section (Rutter & Brodie 1992). Rheological profiles can also be applied to palinspastic reconstructions of mountain belts at different times during their evolution. An application to the Jurassic continental margin and related obducted terranes of the southeastern Canadian Cordillera (Ranalli & Murphy 1987) shows that the large-scale structural characteristics of the system (for instance, sub-horizontal crustal decollements) correlate with the predicted position of the soft ductile layers.

L.. ::i::~::i~il ::i: -40 ~" -60 --r -80 I-- 0. 2o ~ -~° -60 200 0 200 0 300 0 500 0 1000 0 1000 , r I I 0 1000 , -80 a -100 -120 L 0 km Fig. 6. Estimated temperature and rheology in a cross-section across the southern Canadian Cordillera (area shown in inset). Isotherms in degrees Kelvin. Stipple in the temperature section indicates asthenosphere; dashed line the seismic Moho. In the two-dimensional rheological profile, brittle and ductile regions are denoted by heavy and light stipple, respectively; distances from the SW end of the cross-section are marked in the one-dimensional profiles.

L.. ::i::~::i~il ::i: -40 ~" -60 --r -80 I-- 0. 2o ~ -~° -60 200 0 200 0 300 0 500 0 1000 0 1000 , r I I 0 1000 , -80 a -100 -120 L 0 km Fig. 6. Estimated temperature and rheology in a cross-section across the southern Canadian Cordillera (area shown in inset). Isotherms in degrees Kelvin. Stipple in the temperature section indicates asthenosphere; dashed line the seismic Moho. In the two-dimensional rheological profile, brittle and ductile regions are denoted by heavy and light stipple, respectively; distances from the SW end of the cross-section are marked in the one-dimensional profiles.

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