Change of the maximum principal stress during the Laramide Orogeny in the Monterrey salient, northeast México
Gabriel Chávez-Cabello, Tomás Cossío-Torres, Rolando Heberto Peterson-Rodríguez, 2004. "Change of the maximum principal stress during the Laramide Orogeny in the Monterrey salient, northeast México", Orogenic curvature: Integrating paleomagnetic and structural analyses, Aviva J. Sussman, Arlo B. Weil
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Detached folds in the Monterrey salient of the Sierra Madre Oriental fold-and-thrust belt, México, show macro- and mesostructures that demonstrate a change of the regional maximum principal stress from NNE-SSW to approximately E-W compression, during the late stages of the Laramide event. Data were collected along a N-S trending section in the central part of the Monterrey salient. Paleostresses were determined by means of fault slip data inversion. These estimates where corroborated with those from meso-scale structures. Macro and mesostructures suggest that mechanisms of folding are mainly flexural shear and orthogonal flexure at both local and regional scales. The change in orientation of the paleotensor in the central part of the Monterrey salient from NNE to approximately E-W appears to be a local effect of progressive deformation in the Monterrey salient. We conclude that a regional orthogonal flexure of the Sierra Madre Oriental fold-and-thrust belt occurred at the late stage of the Laramide Orogeny and controlled: (1) change of the paleotensor, (2) a fan-shaped arrangement of joints and, (3) divergence of paleostress estimated using fold axes from NNW to NE in the leading edge of the Monterrey salient.