The Ebrahim-Attar (EBAT) leucogranite body is intruded within the Jurassic metamorphic complex of the Ghorveh area, located in the northern part of the Sanandaj Sirjan zone (SaSZ) of northwest Iran. The granite comprises alkali feldspar, quartz, Na-rich plagioclase and to a lesser extent, muscovite and biotite. Garnet and beryl are also observed as accessory minerals. Additionally, high SiO2 (71.4–81.0wt %) and Rb (145–440ppm)content;lowMgO(<0.12wt%),Fe2O3 (<0.68wt.%),Sr(mainly<20ppm),Ba(<57ppm), Zr (10–53 ppm) and rare earth elements (REEs) low content (3.88–94.9 ppm with an average = 21.2 ppm); and flat REE patterns with a negative Eu anomaly characterize these rocks. The chemical composition and mineral paragenesis indicate that the rocks were formed by the partial melting of siliciclastic to pelitic rocks and can be classified as per-aluminous leucogranite or strongly per-aluminous (SP) granite. The Rb- Sr whole rock and mineral isochrons confirm that crystallization of the body occurred at 102.5 ± 6.1 Ma in Albian. The 87 Sr/86 Sr(i) and 143 Nd/144 Nd(i) ratios are 0.7081 ± 0.009 and 0.51220 ± 0.00005, respectively, and Nd(t) values range from −5.8 to −1.6. These values verify that the source of this body is continental crust. The Nd model ages (TDM2) vary between 1.0 and 1.3 Ga and are more consistent with the juve- nile basement of Pan African crust. Based on these results, we suggest that the upwelling of the hot asthenospheric mantle in the SaSZ (likely during the Neo-Tethys rollback activity) occurred after the late Cimmerian orogeny. Consequently, we suggest that this process was responsible for a thinning and heat- ing of the continental crust, from which the SP granite was produced by the partial melting of muscovite rich in pelitic or felsic-metapelitic rocks in the northern SaSZ.
