Shortening estimation in chevron with post flexion deformation

  • Alberto Vásquez-Serrano Centro de Geociencias, Universidad Nacional Autónoma de México, Blvd. Juriquilla 3001, Campus UNAM Juriquilla, Juriquilla, Querétaro, C.P. 76230, Mexico. Departamento de Procesos Litosféricos, Instituto de Geología, Universidad Nacional Autónoma de México, Circuito de la Investigación Científica s/n, Ciudad Universitaria, Coyoacán, Ciudad de México, C.P. 04510, Mexico.
  • Gustavo Tolson Departamento de Procesos Litosféricos, Instituto de Geología, Universidad Nacional Autónoma de México, Circuito de la Investigación Científica s/n, Ciudad Universitaria, Coyoacán, Ciudad de México, C.P. 04510, Mexico.
  • Elisa Fitz-Diaz Departamento de Procesos Litosféricos, Instituto de Geología, Universidad Nacional Autónoma de México, Circuito de la Investigación Científica s/n, Ciudad Universitaria, Coyoacán, Ciudad de México, C.P. 04510, Mexico.
  • Peter Hudleston Departament of Geology and Geophysics, University of Minnesota, 310 Pillsbury Drive SE, Minneapolis, M.N., USA.
Keywords: fold, shortening, dynamic deformation, flattening

Abstract

Folds are geological structures present in many tectonic environments, their geometry allows us to obtain a quantitative approximation of the deformation that they accommodated. Chevron folds are an important tool to estimate shortening in orogenic systems, due to their particular geometry. In spite of this, a method to calculate the amount of shortening (dynamic and kinematic) consistent with the theory of chevron folds has not been proposed. In this work, we propose a new method for the calculation of total shortening in chevron folds that have a post-buckling deformation based on the theoretical considerations of Ramsay (1974). Our method is conceptually simple and general, so that it can be applied to estimate the amount of shortening in the orogenic systems around the world.

 

Published
2019-11-30
Section
Articles