This paper proposes a new method for 3D finite strain analysis. This method utilizes a Mohr circle
construction combined with stereographic projection of the geometry of no finite longitudinal strain and
with the strain ratio on the XZ-plane of the finite strain ellipsoid. The method is described using
numerical examples and then it is tested by applying it to the deformed Deh Vazir conglomerate in the
southwestern part of the Sanandaj-Sirjan HP-LT metamorphic belt, within the Zagros orogenic belt in
Iran. The results of this method compare well with previous finite strain measurements using strain
ratios on three principal planes of finite strain. Calculation of finite strain from strain ratios on the XY and
YZ principal planes is advantageous when preparation of 3 perpendicular sections is difficult or
impossible.
کلید واژگان :
Strain; Deformed conglomerate; No finite longitudinal strain; Zagros; Iran
