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New ⁴⁰Ar/³⁹Ar, geochemical and Srsingle bondNd isotopic analyses of Eocene–Oligocene magmatic rocks in the Lut–Sistan region, eastern Iran shed light on their origin and the regional geodynamic evolution. Samples were collected from outcrops in the Sistan suture zone and to the west on the Lut block, which together constitute a diffuse magmatic province with an estimated size of ~ 300 km × 400 km. Magmatism was active from the Middle Eocene (~ 46 Ma) to the Late Oligocene (~ 25 Ma). The studied rocks are dominated by volcanic and sub-volcanic rocks with minor intrusive rocks, ranging from basaltic to rhyolitic compositions with a peak in intermediate compositions. Most of them have calc-alkaline to high-K calc-alkaline affinity, although shoshonitic rocks are also present. The rocks are characterized by (i) E-MORB-like ratios involving high field strength and heavy rare earth elements, and (ii) an …