ESTIMATION OF THE SHORTENING DEFORMATION VALUE IN TERRIGENOUS ROCKS USING NON-DIRECTIONAL RANDOM CROSS-SECTION METHOD (BELAYA RIVER, NORTHERN CAUCASUS)

The shortening deformation value was estimate in Lower and Middle Jurassic terrigenous rocks of the Northwestern Caucasus (Belaya River valley) using cleavage morphology. Numerical definition of deformational ellips’ axis ratio were obtained using Fry method «centre-to-centre» additionally. This paper shows that the deformational value may be quantitate correctly for random cross-section series of cleavage terrigenous rocks. The non directional random crosssection method described here can be used to quantify the shortening deformation of statistically significant sample series.