Abstarct: The post-ophiolite igneous rocks with andesite/trachyandesite, trachydacite/dacite and rhyolite/rhyodacite in composition cut the late Cretaceous–Paleocene Sabzevar ophiolitic complex as widespread domes, stock and dykes. The most abundant minerals in these rocks are plagioclase and amphibole. These rocks show various textures such as felsitic porphyry, microlitic porphyry, sieve, flow and glomeroporphyric. Amphibole chemistry ranges from Mg-hastingsites and tschermakites in andesites/trachyandesites to magnesiohornblende in dacites. All amphiboles are low Al# (<0.21) and are found to be in equilibrium with high H2Omelt values of 4.2 to 10.3 wt% (±0.5), consistent with values assumed for ‘wet’ primitive calc-alkaline magma suites. Plagioclase compositions vary between An70 to An8. Geochemical studies show calc-alkaline and mextaluminous to peraluminous nature of these rocks which is characteristics of the arc volcanics. Enrichment in light rare earth elements (LREEs) and large ion lithophile elements (LILEs) and depletion in heavy rare earth elements (HREEs) are obvious in their primitive mantle and chondrite normalized spider diagrams. These characteristics combined with high Na2O, Al2O3, Sr, high Sr/Y and low K2O/Na2O ratios with depletion in HREEs, Y and HFSE are similar to the range observed in typical high-silica adakites (HSA). The emplacement age of these rocks into the Sabzevar ophiolitic zone obtained about 45 Ma by SHRIMP II U–Pb method on separated zircons. baxsed on the amphibole thermobarometry, plagioclase/melt thermobarometry and clinopyroxene/ melt barometry models, plagioclase crystallized dominantly at pressures of 350 (130 to 468) MPa, while amphiboles record both low pressures (300MPa) and very high pressures (>700MPa) of crystallization. The latter is supported by the calculated pressures for clinopyroxene crystallization (550 to 730MPa). The association of amphibole with clinopyroxene and no plagioclase phenocrysts in the most primitive samples (Mg-andesites) is consistent with amphibole fractionation from very hydrous magmas at deep crustal levels of the plumbing system, which may have been a key process in intensifying adakite-type affinities in more evolved suites (dacite and rhyolite). Barometry, combined with disequilibrium features such as oscillatory-zoned and sieve-textured plagioclase crystals with An-rich overgrowths in more evolved samples, implies that final magma differentiation occurred in an open magma system in upper crustal levels. . The post-ophiolite rocks of Sabzevar zone display initial 87Sr/86Sr ratios and εNd (45 Ma) values of 0.704758 to 0.703790 and +5.26 to +6.54 respectively, as same as these values in MORB compositions which are corresponding to adakitic compositions derived from melting of Cenozoic oceanic subducted slabs. The results show that parental magma of the Sabzevar adakitic rocks were generated by partial melting of a garnet-amphibolite or eclogite source derived from mextamorphism of Sabzevar subducted oceanic lithosphere in early Eocene time.