Abstarct: The studied area includes parts of North and south of Birjand. This area is located in the east of Central Iran zone and in the other word, some parts of Lut Block. In this area, there are numerous subvolcanic- plutonic bodies which they emplaced mainly in the form of domes and dikes (rarely sill). Mayakuh, Hamond, Rami, Givshad, Runeshk, Chah Nuri, Dokuheh, Allahyar and Lukhi Siahvar pluton are typical examples of this association. These bodies emplaced in Eocene volcanic- volcanosedimentary and volcaniclastic rocks and Cretaceous- Paleocene ophiolitic rocks. With respect to field observations, they have late Eocene- early Oligocene (?) ages. The mentioned bodies have lithological compositions include andesite- trachyandesite, trachydacite, dacite, rhyolite and syenite. These rocks have a wide variety of porphyry, glomeroporphyry, microlitic porphyry, trachitic and granular textures. baxsed on the chemical analyses results and geochemical diagrams, these rocks show a nearly continuous fractional crystallization trend, but Mayakuh rhyolitic dome is more differentiated than the other domes and Lukhi Siahvar syenitic pluton is more interest with enrichment of K and HREE. baxsed on the geochemical diagrams such as incompatible - incompatible, incompatible- compatible and compatible - compatible diagrams, the studied rocks followed from a mainly fractional crystallization trend and with less extent of assimilation and fractional crystallization trend (AFC). The present of the following enclaves are evidences of crustal assimilation: garnet bearing granitic gneiss (in Mayakooh), amphibolitic (Dokuheh), micaschistic (Chah Nuri and Runeshk) and mextasandeston (Hamond) and totally quartzitic (Hamond and Allahyar). baxses on the REE and spider diagrams, the studied rocks are enrichment in LREE and LILE and depleted from some of the HFSE (such as Nb and Ta). baxsed on these diagrams Mayakuh dome is more different than the other domes with showing more depletion from HREE and more enrichment from LREE and LILE. baxsed on the geochemical characteristics, the studied rocks are belong to high silica adakites and resulted from melting of subducted oceanic slab and probably overlay mantle wedge. Of course, mextasomatized mantle is contributed in these evolutions by considering the geology and historical geology of the studied area. It is possible to say that the studied rocks are resulted from fractional crystallization of magmas which produced by melting of Neotethian oceanic slab beneath the Helmand - Farah continental crust (slab).