Iran contains two major mountain ranges, the Alborz in northern Iran and Zagros in western Iran. Each range is associated with a major suture zone, the Alborz-Kopeh Dag and the Bitlis-Zagros sutures respectively. These mountain chains surround Central Iran, in whose southern part lies the Lut block and Bazman. Tectonically, southern central Iran does not follow the typical Alpide geological patterns insofar as faults are rare and the folds in the crust are broad. The Bazman area is covered by volcanic rocks of Tertiary age. The foreland of the mountain massifs such as the Bazman massif are affected by tectonic subsidence. A major Tertiary volcanic belt, analogous to the Indonesian volcanic arc, crosses Iran behind the Zagros.