Petrology and geochemistry of intrusive body of iron deposit of Sarab-3, east of Takab-north west of Iran

The Sarab-3 intrusive body is located in the NW of Iran¡ in Sanandaj-Sirjan zone and in the east of Takab city. Based on field observations as well as petrographic features¡ the lithologic composition of intrusion (Miocene age) ranges within the diorite-leucodiorite¡ monzodiorite¡ quartz monzodiorite¡ granodiorite and granite. In terms of geochemical characteristics¡ the rocks studied¡ are I-type¡ with calc-alkaline affinity and meta-aluminous character. Enrichment of LILE (K¡ U¡ Sr¡ Ce¡ Th¡ Pb¡ Ba) and LREE relative to HFSE (Zr¡ Y¡ Ti¡ P¡ Nb) and HREE¡ low Ce / Pb and Nb / U ratios and high Ba / Nb reveal that the rocks under study were originated in an active continental margin subduction-related tectonic setting. The negative anomalies of Ti¡ Nb and P on the spider diagram also confirm this fact. Low ratios of (Na2O K2O / (FeOt MgO TiO2) and (Al2O3 / FeOt MgO TiO2) along with low Rb/Sr concentration (