Abstract
Finite strain and vorticity of flow analyses were carried out within the Deh Vazir deformed conglomerates in the Sanandaj-Sirjan metamorphic belt (Zagros Mountains, Iran). This belt is in a sequence of tectono-metamorphic complexes made of low- to high-grade metamorphic rocks affected by a polyphase deformation history. Using R f/φ technique for two-dimensional strain analysis showed that the finite strain of XZ plane is R S = 3.7 ± 0.70. The calculation of the harmonic mean from the axial ratios of the extracted pebbles and plotting these data in the Flinn diagram resulted in K = 0.7 ± 0.38 (i.e. oblate strain ellipsoid). Kinematic vorticity analysis of deformed pebbles showed that W K parameter is 0.59 ± 0.10 (i.e. pure-shear dominated non-coaxial flow). The results quantitatively support the recognition of a partitioned dextral inclined transpressive regime with bulk triclinic symmetry along the Sanandaj-Sirjan metamorphic belt resulted from the oblique collision between the African–Arabian continent and the Iranian microcontinents.
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