Abstarct: Late Neoprotrozoic Reza Abad igneous - mextamorphic complex cropped out in the west of Reza Abad - e - Khartooran (southeast of Shahrood) and in the northern edge of the Central Iran structural zone. This complex includes a wide range of igneous and mextamorphic rocks such as mextapelite, mextapsammite, mextacarbonate, mextabasite and leucogranite. These rocks intruded and cut by middle Jurassic diabaxse dike swarms and some small basic – inetrmediate intrusions (with gabbro to diorite compositions). Gneissic rocks are placed on the classification diagrams of igneous rocks in the granite and granodiorite domains. They have calc-alkaline to high potassium alkaline nature. The protolith of amphibolitic rocks (or mextabasites) has been subalkaline basaltic compositions, and then igneous origin. Leucogranites have calc- alkaline up to high potassium calc-alkaline and peraluminous nature, and belong to S type granitoids. Middle Jurassic diabasic dikes or small intrusions have gabbro and dioritic composition and or their extrusive equivalents, and they have alkaline to sub- alkaline nature. Rock forming of these dikes show granular, microgranular, ophitic and porphyroitic textures. Plagioclase and pyroxen (augite) are essential minerals. Apatite, sphene, zircon, magnetite, titanomagnetite are accessory minerals. Chlorite, calcite and epidote are secondary minerals. These dikes or small intrusions are typical eviodences of middle Cimmerian magmatism in the northern edge of Central Iran microcontinets.