The studied area is located in the south to east of the Qorveh city (Kurdistan Province) in the Sanandaj-Sirjan zone. Based on field observations, the dykes are mafic to dioritic in composition, and followed by granitic dykes with low abundances and they have intruded in the granitoid rocks. The most abundance dykes are diorites (monzodioritic and quartz-monzodioritic rocks). The dioritic rocks consist of plagioclase (An54.87-45.95), pyroxene (Wo 32.92-50.77 En 36.28-40.55 Fs 8.67-27.89), hornblende and sometimes K-feldspar and quartz. The mafic rocks include plagioclase (An66.28-58.72), clinopyroxene, orthopyroxene and hornblende which based on mineralogy and geochemical classification are divided to two groups: gabbroic and gabbro-noritic rocks. Biotite, apatite, titanite, zircon and opaque minerals are their accessory minerals in both of group. Microscopic studies and microprobe analyses data show amphiboles and biotites are Mg-hornblende and annite, in composition, respectively. The mafic rocks have tholeiitic affinity, but dioritic dykes belong to the MK- calc-alkaline series. Spider diagrams imply enrichment in LILE (such as Cs, Rb, U & Pb), depletion in HFSE (Nb and Ba) and high LILE/HFSE ratio. The enrichment in LILE and Pb suggest the crustal contamination. The tectonic setting discrimination diagrams reveal all of rocks belong to volcanic arc related to an active continental margin setting
