Plio-Quaternary tectonics of central Mexican Volcanic Belt and some constraints on its rifting mode

Stratigraphy and structure of the central sector of the Mexican Volcanic Belt and adjoining areas were investigated in order to evaluate its Plio-Quaternary tectonic evolution, the stress directions, and their relative values. Three main periods, characterized by different mechanisms of deformation limited to the MVB area, may be grouped in a single deformation cycle. The kinematics and the uniformity of the stress trajectories during Plio-Quaternary times suggest plate tectonic control and a passive mode of rifting. In this framework the large amount of magma extruded is believed to be produced by a thermal anomaly induced by the rifting and affecting also the subducted slab. -from Authors