Layer parallel shortening in salt-detached folds: constraint on cross-section restoration |
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| Authors: | M Sans J Vergs E Gomis J M Pars M Schiattarella A Trav F Calvet P Santanach A Doulcet |
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| Institution: | M. Sans, J. Vergés, E. Gomis, J. M. Parés, M. Schiattarella, A. Travé, F. Calvet, P. Santanach,A. Doulcet |
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| Abstract: | Cleavage-fissility perpendicular to bedding is a common feature in the external part of fold-and-thrust belts. Three techniques were used to determine the internal distortion in the frontal Southern Pyrenees: the analysis of strain markers such as burrows and rain drops, the measurement of fissility, and the measurement of anisotropy of magnetic susceptibility (AMS). The comparison of the three techniques showed a good fit although they differ in sensitivity to penetrative strain variations in the range of deformation values explored in the study case. On the regional scale, the values of layer parallel shortening (LPS) derived from the markers analysis are very constant and account for 16–23% of shortening. These values are two to three times larger than the shortening values calculated from the restoration of the macroscopic scale structures and indicate a good decoupling above the Cardona salt Formation. This study permitted an accurate restoration of the low-amplitude el Guix detached anticline. |
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| Keywords: | Penetrative strain Strain markers Fissility AMS Fold-and-thrust belt Pyrenees |
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