Petrography and Geochemical Relationships of the Ultramafic Rocks in Galalah area within Erbil Governorate, NE Iraq

The current research to study the petrography, mineralogy and geochemical relationships of ultramafic rocks in Galalah area within Erbil Governorate, at Unstable Shelf Imbricate Zone, determine origin rocks. Dunite Harzburgite are most abundant rock bodies area, they represent outer surface exposure aggregates. dunite characterized by pale brown color on altered that is broken into olive green dark lithic. represents a homogenous lithologic feature mainly consists predominately olivine with accessory spinel traces orthopyroxene. While harzburgite appears as massive body consisting olivine, orthopyroxene, clinopyroxene. These alteration serpentinite, chromian spinel, secondary magnetite, chlorite, talc. studied rich ferromagnesian minerals less silica content, other major elements affected serpentinization causing deviation elements. They have strong decrease sodium calcium oxides relative MgO verified alumina slight increase iron oxide. low values TiO2 characteristic property Alpine type ophiolites during primary process mantle its upper part, before tectonic emplacement rocks, also due partial melting degree for asthenospheric mantle. MREE depletion HREE LREE may be attributed hornblende absence presence pyroxenes and/or source features. U-shaped patterns REE their ratios typical properties ophiolitic which compatible supra-subduction zone. During melting, negative anomalies Nb sequestration concentration sphene ilmenite various types been crust contamination. island arc conditions, indicate fore-arc environments