Zhob valley ophiolite comprises Khanozai, Muslim Bagh, and Zhob chromitite occurrences located in Pakistan. These occurrences occur in massive, disseminated and nodular which exhibit both magmatic and deformational texture. The Muslim Bagh and Khanozai chromitites are classified into high-Cr chromitite (Cr#=0.66-0.85) while Zhob chromitite falls into high-Al chromitite (Cr#=0. 53-0.58) composition. The calculated values of Al2O3 (wt%) and TiO2 (wt%) for parental melts of high-Cr chromitites show similarities with boninitic melts, whereas those of the high-Al ones exhibit MORB melt affinity Minor and trace element contents (Ti, V, Ni, Zn, and Ga (ppm)) are higher in high-Al chromitites than high-Cr chromitites and contrasting geochemical behavior of these elements with Cr# might be due to magma fractionation. MORB normalized major and trace element patterns of high-Cr chromitite show similar patterns with boninite while high Al chromitite differs from boninite. Field and textural investigations, major and trace element geochemistry, and the presence of hydrous silicate inclusions, indicate that high-Cr chromitite were generated in equilibrium with boninitic melt, possibly in supra subduction zone. In contrast, high-Al chromitite crystallized from MORB-like melt during reaction with depleted mantle and probably originated in a back arc basin tectonic environment.