ABSTRACT: In thİA research the Serçeme creek and surrounding area in the NW of Erzurum have been Investigated. Producte of magmattsm comprises ultramafie rocks wMeh were intruded In the Upper Cretaceous and Tertiary boundary. They are compoaed of harzburgite and serpentïnite and Generally replaced by maJdmgcold fintnufon in to a tectonic Ipaumöary along which Lower Cretaceous Umaston© im thrusted on UpperCretaceous limestone, Serpenttnizatioii increases toward the nıargîns. miat situation pointe out that serpentinr/alion Is facilitated by tectonic agents. Serpentine minerals were studied by P.TÉA. method and It wasfound that those serpentinites contain mostly Mzardite. chry»ottle and chlinochrysotile but antig^rite.