Statherian (ca. 1714–1680 Ma) Extension-Related Magmatism and Deformation in the Southwestern Korean Peninsula and Its Geological Significance: Constraints from the Petrological, Structural, Geochemical and Geochronological Studies of Newly Identified Granitoids

In this study, petrological, structural, geochemical, and geochronological analyses of the Statherian alkali feldspar granite porphyritic in southwestern part Korean Peninsula were conducted to examine petrogenesis granitoids their tectonic setting. Zircon U-Pb dating revealed that two granites formed around 1.71 Ga 1.70–1.68 Ga, respectively. The results geochemical showed both have a high content K2O, Nb, Ta, Y, as well FeOt/MgO Ga/Al ratios. Both alkali-calcic characteristics with ferroan composition, indicating an A-type affinity. Lu-Hf isotopic compositions yielded negative ?Hf(t) values (?3.5 ?10.6), derivation from ancient crustal materials. types underwent ductile deformation exhibited dextral sense shear minor extension component. Based on field relationships zircon dating, it was considered event postdated emplacement terminated soon after extensional These data indicated there extension-related magmatic activities accompanying during 1.71–1.68 Ga. events are correlated those midwestern eastern parts North China Craton.