Abstarct: Band-e-Hezarchah granitoids (BHG) located in the northern margin of the central Iran structural zone and 100 Km SE Shahrood city. The BHG intruded in late Neoproterozoic mextamorphic rocks and covered by the late Triassic -lower Jurassic sedimentary sequences Neoproterozoic mextamorphic host rocks consist of slate, phyllite, mextagraywacke, marble, mextabasites, mica schist, gneiss and garnet-bearing gneiss. The BHG mainly include granite, alkali feldspar granite and leucogranite. The BHG and its host mextamorphic rocks are crosscut by middle Jurassic diabaxse dyke swarms. These dikes don’t cut younger rocks such as lower Cretaceous (Neocomian) limestones and Eocene volcano-sedimentary rocks. baxsed on the results of thermobarometry on mica schists, gneisses and migmatites, they show temperatures of 531 to 707 ºc with average pressure 8Kb. The mextabasites show temperatures of 429 to 630ºc with average pressure 7Kb too. These temperatures and pressures suggest T-P conditions equal to amphibolite and amphibolite to green schist facies respectively. Thermobarometry study on diabaxse dike swarms indicate that they crystallized dominantly at pressures of 2 to 7 Kb and temperatures of 1100 to 1190 ºc. The BHG has calc-alkaline and peraluminous signature. U-Pb zircon dating on 3 sample of the BHG granites yield 238U/206Pb crystallization ages of 529,540 and 553 Ma (Ediacaran-early Cambrian). U-Pb zircon dating on 3 sample of mica schists, gneisses and migmatites yield 238U/206Pb ages of 555, 531 and 540 Ma respectively. U-Pb zircon dating on 2 sample of the BHG mextabasites yield 238U/206Pb ages of 533 and 582 Ma. The initial 87Sr/86Sr ratios and εNd (550) values for mextabasites are change from 0.705 to 0.706 and -3.5 to -3.6 respectively. Sr-Nd isotope composition of mextabasites indicates that these rocks were derived from a subcontinental lithospheric mantle source. The initial 87Sr/86Sr ratios and εNd (550) values for gneisses and migmatites are change from 0.7075 to 0.7081 and -2.98 to -5.97 respectively. Sr-Nd isotope composition of these rocks indicates that these rocks were derived from a crust source. The initial 87Sr/86Sr ratios and εNd (150) values for diabaxse dykes are change from 0.704 to 0.707 and 4.66 to 6.69. Sr-Nd isotope composition of mextabasites indicates that these rocks were derived from a subcontinental lithospheric mantle source. Field and geochemical evidences show the BHG is a S-type granite and its magma seem to have originated from melting mextapelitic and mextagraywacke mextamorphic rocks in the active continental marginal above a subduction zone. These rocks are thought to be formed in a continental arc setting, related to the oblique subduction of Proto-Tethys oceanic lithosphere beneath the northern margin of Gondwanan supercontinent during Ediacaran- early Cambrian time. The mextabasites have calc-alkaline signature and their magmas seem to have originated from a mantle wedge above a subduction zone. These rocks are thought to be formed in a continental back arc setting, related to the oblique subduction of Proto-Tethys oceanic lithosphere beneath the northern margin of Gondwanan supercontinent during Ediacaran-Cambrian time. baxsed on geochemical characteristics, Diabaxse dykes have alkaline to sub alkaline nature. These rocks have formed in an initial back arc basin setting related to subduction of Neo-Tethys oceanic lithosphere beneath the Central Iran microcontinent during Middle Jurassic.