Amphibolitic rocks are the main part of the north of Khoy metamorphic complex. Petrographicaly these rocks are normal amphibolite, muscovite amphibolite, biotite amphibolite, garnet amphibolite and pyroxene amphibolite. The protolith of these rocks is mainly igneous. These rocks belong to tholeiitic and calc-alkaline series and Ocean Floor Basalt and Arc tectonic setting. These two distinctive tectonic setting clearly are distinguishable in REE and spider diagrams as samples from Oceanic Floor Basalt are steeper and enriched LREE than those from Arc samples.Considering the fact that Sialic Back Arc Basins can show MORB and Arc characters together, therefore probably amphibolitic rocks of study area generated in this tectonic setting.