Lithofacies and petrofacies of Oligocene deposits in Binalood Zone: Implication for tectonic setting of sediments in Baghshan-Gach section, North of Neyshabour

Lithofacies analysis and interpretation of architectural elements of Oligocene silisiclastic deposits in Binaload Zone were investigated in Baghshan-Gach area, north of Neyshabour. This study led to identification of 14 lithofacies and 4 architectural elements in the sequence of 150 meter thick. Lithofacies are classified into three categories including coarse grain (Gmg, Gcm, Gmm, Gh, Gp and Gt), medium grain (Sh,Sp,St,Sr,Sm and Sl), and fine grain (Fl,Fm). The architectural elements are CH, SB, LV and SG. It is interpreted that Oligocene silisiclasic sediments have been deposited in braided river system, based on lithofacies analysis and architectural elements. Petrofacies analysis indicates that these rocks had oroigin from the magmatic arc and deposited under arid climatic condition. paleocurrent analysis represents that the river was flowing from NE to SW direction.