Structural Mechanisms of the Quaternary Basalts in Bijar area, west of Iran

In Sanandaj- Sirjan zone a vast outcrops of volcanic rocks, which founded as high terraces, are covered the Pre-Quaternany rocks. The volcanic rocks are appeared in different shapes and morphological features. Based on the Zagros geodynamical evolution, mentioned rocks assumed to be Post – Collissional, that are formed in an extentional system with a NW-SE trend. Three studied complexes in this paper are Ahmad abad, Tahmures and Nadri. The structural investigation of three the sites are complementary data to the geochemical analysis. In this regards, structural investigation done in those 3 mentioned sites. Studied faults shows different trends and age. Mechanism of faults are normal, and their age are either Post- basalt or syn-basalt, that is, Contemporaneous with the last deposition of late-Miocene marls. The age of the oldest faults is late- Miocene, before basalt intrusion.