In this article, the petrological processes of the clinopyroxenite dykes and host peridotites occurring in Ulaş District (Sivas, mid-Anatolia, Turkey) are discussed. The new geochemical data from major minerals in the clinopyroxenite dykes and host harzburgites revealed differences to the supra-subduction zone (SSZ)-type pyroxenites and peridotites. | Mineral records of the pyroxenites formed within harzburgites (Ulaş, Sivas, Turkey): implications on petrogenesis and tectonic setting