Аннотация:The application of classic geometric techniques in cross section balancing and restoration has restricted our understanding of rotational kinematics. Vertical-axis rotations are common in most curved orogenic systems, and the presence of such rotations provides valuable information that can be integrated with other geologic constraints. If paleomagnetic data are available in an area and reliable rotation values can be determined, then those shortening values obtained using traditional methods of restoration can be corrected by removing the deflection (error) due to rotation. This paper presents two trigonometric map-view methods (corrected shortening and realistic shortening) that allow for more accurate shortening estimates in areas that have undergone rigid-body rotations about a vertical-axis. In order to use these models, paleomagnetic data should record similar rotation magnitudes along strike, structural analysis should indicate a generally continuous shortening gradient, the location of the rotation axis (tip line of the fault) should be identified, and apparent/spurious rotations should be removed from any rotation values used in the models.
