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Introduction The tectonic unit of eastern Iran, namely the Lut Block and the Flysch Zone, represent a complex tectonic history related to the evolution of the Sistan Ocean. The Lut Block, as the main body of eastern Iran, confined by faults, extends for about 900 km in the N-S direction (Stocklin and Nabavi, 1973) and only 200 km wide in the E-W direction. The Lut Block is composed of volcanic, volcaniclastic, subvolcanic, and intrusive rocks. The geological history of the Lut Block is characterized by magmatic activities from Middle Jurassic (the S-type Shah-Kuh granitoids; 165-162 Ma) to Cenozoic oceanic island basalts (15.5-1.74 Ma); thus, igneous rocks cover over half of this zone with up to 2000-m thickness (Karimpour et al., 2011). Meanwhile, Tertiary period (42-33 Ma) has a special importance in terms of magmatism and mineralization (Karimpour et al.

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