Abstarct: Razzeh area is a part of north of central Iran structural zone located in NE Troud (SE Shahrood). In this area, a significant number of subvolcanics igneous bodies are exposed, which mostly emplaced in the form of domes, dikes and rarely sills. Bazmin and Andarkuh domes are their typical examples. Those are emplaced in the Eocene volcanic and volcano- sedimentary rocks. baxsed on the field observation and age determinations donned on the same plutonic and subvolcanic rocks of north of central Iran structural zone magmatic belt, the mentioned domes most probably are younger than Lower Eocene and their age range are between middle Eocene to upper Eocene. Their composition cover a range from trachyandesite to trachybasaltic andesite. Rock forming of these domes show porphyry, glomeroporphyritic and mycrolitic porphyry, flow and sieve textures. These domes include enclaves with various shape, mineralogical composition and lithology. Thire nature are amphibolitic, gneissic, micaschistic, mafic microgranular and mafic clots. Amphibolitic, gneissic and micaschistic enclaves are obvious evidences of continental crust contamination. Mafic clots and mafic microgranular enclaves are obvious evidences of magma mixing. According to general geology of this area, amphibolitic and gneissic enclaves are originated from mextamorphic rocks of lower crust. Mafic microgranular enclaves and mafic clots, resulted from the primary crystallization and crystal acomulation and mixing of magma mafic components during later magma ascent. Also according to the results of chemical analysis and geochemical diagrams, these rocks show an almost uniform fractional crystallization pattern. baxsed on the incompatible- incompatible, compatible- incompatible and compatible- compatible diagrams, the studied rocks fallow from a fractional crystallization trend, associated with crust assimilation and magma mixing, but fractional crystallization process is more effective than others. According to normalized spider and rare earths elements diagrams, the studied rocks show an enrichment in large ion lithophyle (LILE), light rare earth elements (LREE) and high filed strength elements (HFSE) and a depletion in heavy rare earths elements (HREE). These properties are typical geochemical evidene of continental arc magmatic belts. baxsed on the geochemical characteristics the studied rocks are classified as low silica adakitie. These low silica adakitics (LSA) are originated from crystallization of melt which originated from melting of mextasomatised peridotitic mantle wedge by fluids which released during subduction and mextamorphism of Sabzevar- Darouneh Neotethian subducted oceanic slab beneath to southern margin of northern part of central Iran structural zone.