Abstarct: Shotor-Kuh mextamorphic-Igneous Complex (SKMIC) located in the 80 Km SE Shahrood and northern margin of the central Iran structural zone. This complex includes wide variety of mextamorphic rocks: mextapelite (phyllite, micaschist and paragneiss), mextabasite (amphibolites and garnet amphibolites), mextasandstone (mextapsammite), mextagraywacke, and mextacarbonate (calcitic and dolomitic marbles). Protoliths of the mextabasite had been submarine basaltic lava flows, diabasic dike swarms and small-scale predotite, olivinegabbro, gabbro and dioritic intrusions. mextamorphism intensity in the highest degree resulted in producing of granitic aplites from mextapelites and tonalite and plagiogranite from mextabasites. Anatexy leucogranites intruded in the SKMIC in the form of packets, veins, dikes, apophyses, and small-scale intrusions. Shotor-Kuh Complex overlaid by the late Triassic -lower Jurassic sedimentary sequences which then supposed low grad mextamorphism. The SKMIC and lower Jurassic rocks are crosscut by middle Jurassic diabasic dykes. In respectively, baxsed on the obtained thermobarometry results of mextapelites, mextabasites and olivine gabbros, formed in temperatures of 450-760, 618-626 and 1008-1358 ºC and average pressure 7-13, 9-11 and 6-10 Kb, which corresponds to P-T conditions of amphibolite and upper amphibolites facies. mextamorphic rocks with mextamorphism in the limit of greenschist facies have very low extension outcrops. U-Pb zircon dating on gneisses, mextabasites and mextarhyolites yield 238U/206Pb ages of 571 to 526 Ma. The initial 87Sr/86Sr ratios of leucogranites (0.718243), gneisses (0.709018) and mextabasites (0.706036-0.712020), and also εNd (550) values of leucogranites (-6.96), gneisses (-3.94) and mextabasites (-2.87 to 4.25) indicates that leucogranites and gneisses were derived from a crust source and the primarily of protoliths of mextabasites derived from a subcontinental lithospheric mantle source. baxsed on field geology, petrography and geochemical evidences, the extensional regime of the late Neoproterozoic sedimentary basin of Iran led to formation of limited extensions of sea-ocean basins. The primarily sedimentary sequences (protoliths of the SKMIC) formed during intracontinental extensional tectonic regimes (in back arc basin or rifting tectonic setting). These intracontinental basins, have been closed during fast closure event, then mextamorphosed and formed tectonic mélange or accretionary prisms. With respect to time range of carried out procedures, these mentioned mextamorphism and magmatic events are considered some parts of Cadomian orogeny.