Abstarct: Delbar mextamorphic – Igneous complex with NE-SW trend is located in 130 Km southeast of Shahrood, southeast of Biarjmand area in Northern margin of the central Iran zone. The mextamorphic and igneous rocks exposed in two parts of region including northeast (Kalate-Alaeedin Mountain) and southeast (west of Molhedou Mountain) parts. This complex covered by Jurassic and Cretaceous units with unconformity boundary in central parts known as Molhedou Mountain. The Delbar complex consists of mextapelitic rocks (phyllite, micaschist and paragneiss), mextasandstons (mextapsammite and mextagraywacke), mextacarbonatic rocks (limestone marble and dolomitic marble) and mextabasites (amphibole schist, amphibolite and garnet amphibolite). mextacarbonates and mextapelites alternation in the upper parts of complex indicated the alternative sedimentary in the primary basin resulted of changing in depth and sedimentation conditions. mextabasites exposed as dike and rarely sill and mextamorphosed basic lavas in micaschist-gneiss rocks. The mextabasites are the amphibole schist, amphibolite and garnet amphibolite compositions baxsed on the field and petrographic studies. The main characteristics such as lithology and the age range of sedimentary protolith of Delbar complex are analogous to the ancient sedimentary sequences like Kahar and Tashk formations in Central Iran. The anatectic granites and leucogranites intruded in mextamorphic rocks as patchs, pegmatitic veins, dikes, apophyses and small intrusions. The mextamorphic – Igneous complex and Lower Jurassic units crosscut by Middle Jurassic diabaxse dikes, which not intruded in the upper Jurassic sandy and fossiliferous limestones (Delichai formation equivalent) and lower Cretaceous limestones (Neocomian). mextapelittic rocks consisted of quartz + alkali feldspar ± muscovite + biotite ± garnet + plagioclase ± kyanite ± staurolite paragenesis. The biotite, garnet, staurolite and kyanite zones appearance is micaschists is compatible with Barrovian type regional mextamorphism zonation under the green schist to the upper amphibolite facies. The biotite decreasing and orthoclase increasing in the mextapelites and mextapsammites resulted of the decomposition and dehydration biotite caused to orthoclase rich parts and migmatites. These evolutions represents the partial melting initiation and generation of the felsic melts composed of quartz and alkali feldspar which intruded in the host rocks as patch, small laxyers (stromatitic migmatites) and pegmatitic veins with tourmaline and muscovite. The results of thermometry demonstrate 468-498˚C temperature ranges and 6.4 -7.2 Kbar pressure for micaschists and 645-706 ˚C and 8-13 Kbar for garnet gneisses which indicate greenschist for micashists and upper amphibolite facies for gneisses respectively. The results of thermometry baxsed on the garnet-hornblende pair demonstrate 592-693 temperature ranges and 12.3 -13.4 Kbar pressure for the amphibolites which indicate upper amphibolite facies conditions relevant to the kyanite stability pressure. Zircon U–Pb dating results of the gneisses and granites with SIMS and LA-ICPMS methods yielded the ages of 541 to 547 Ma are consistent to the late Neoprotrozoic- early Cambrian (Late Ediacaran - Early Cambrian) ages. The REE variations of mextapelites and granites compared to the REE trend variations of continental references values, are analogous to the upper continental crust, which indicated the relationship between these rocks together and to the crustal source. These rocks formed in the active continental margins or continental arc tectonic setting baxsed on the discrimination tectonic setting diagrams. The studied granites and leucogranites have gtranitic composition with calc-alkaline to high K calc-alkaline peralumine nature represented the crustal source, mextapelitic and mextapsammitic protolith futures. The ortho-amphibolites with sab-alkaline basaltic composition showed the depleted in Ti, Nb and Zr and enrichment in Pb and LREE typical of subduction related magmas. The primary mafic magmas oh amphibolites originated in the Cadomian back arc basin related to the crustal extensional and thinning. The results of Debar complex comparison to the Gondwana terrances in the world illustrated the early Cambrian evidences in the Gondwana margins in Himalayas, Arabian platform, Iran and Turkey resulted of Gondwana affinities and calc-alakline active continental margin futures which formed in the late Neoprotrozoic- early Cambrian throughout the Cadomian orogeny. The diabaxse dikes have gabrro and monso gabrro composition with alkaline to calc-alkaline nature baxsed on the geochemical characteristics. The parental magmas of the studied dikes produced from low degree partial melting of a spinel lherzolite and garnet free enriched mantle source. These dikes generated in a back arc extentional setting related to the Neotethys plate subduction under the Central Iran lithospher in Middle Jurassic. U-Pb dating results on apatites from these dikes, indicated 152± 35 Ma age, which completely confirmed field and stratigraphic relationships.