Northwest Iran, known as the northern part of the Sanandaj Sirjan zone (SaSZ) and northwestern Iran block, has more similarities to the geology of Turkey than to the geology of Iran. The Anatolide–Tauride (AT) block, which is surrounded by the Pütürge–Bitlis–Zagros (PBZ) suture zone in the south and Izmir–Ankara–Erzincan suture zone (IAE) in the north, continues to the Kermanshah area known as the Biston-Avoraman block (BAVB) in western Iran. The BAVB is squeezed between two narrow ophiolite belts, similar to the AT block in Turkey. In addition, the magmatic activities in the Pontides in the northern IAE suture zone are more consistent with the Saveh-Taftan Eocene volcanic arc in the eastern SaSZ. Due to the existence of some strong similarities between the AT and BAVB basements and tectonic regime, the Zagros suture zone is not the boundary of the Arabian and Iranian plates in the northwest of Iran; it represents the boundary in the southwestern part of Iran. In northwestern Iran, the oceanic ophiolite, which extends in a SSE to NNW trend, starts from the Sanandaj- Oshnaviah and Khoy area, and joins to the IAE ophiolite belt in northern Turkey in the IAE suture zone. The wide extension of the ophiolite sequences in NW Iran at the junction of AT and NW Iran blocks, and also some clear relative resemblance between the magmatic activities in northwest Iran and northern IAE, such as Cretaceous volcanic and Paleocene-Eocene adakites support us to think about new geodynamic models in NW Iran. The distribution of the parallel ophiolite belts with three clear arc volcanic activities; Late Cretaceous, Paleocene-Eocene and Miocene-Pliocene infer the junction or collision of the AT and the NW Iran blocks. Besides, this has made an essential role for magmatic activities from the Late Cretaceous to Quaternary in the NW Iran. Considering all geological evidence, double collision systems such as the northern and southern AT block is not unexpected in northwestern Iran in the Late Cretaceous?-Cenozoic. To solve this important problem, detailed structural mapping and correlation of the magmatic activities would be much useful to understand the junction of AT and NW Iran block. .
