The Paleoproterozoic Evolution of Basement Rocks of the Taebaeksan Basin, Korean Peninsula, and Their Correlation to Those of the Paleoproterozoic Massifs in the Korean Peninsula

The Korean Peninsula mainly comprises the Paleoproterozoic Gwanmo, Nangnim, Gyeonggi, and Yeongnam massifs from north to south. basement is rarely exposed in Paleozoic Taebaeksan basin, which located northeastern part of Okcheon belt between Gyeonggi massifs. One most important issues tectonic interpretation whether rocks basin have an affinity with those or To solve this problem, we focused on petrogenesis Imgye gabbroic diorite, Jungbongsan granite, Jangsan quartzite area basin. diorite shows mafic intermediate compositions slightly enriched LREEs compared HREEs, positive Rb, K, Pb anomalies, negative Ta, Nb, P anomalies. formed a volcanic arc setting. geochemical granite show HREEs Eu reveal strong Th, anomalies Ba, Sr, P, Eu, Ti This also setting like diorite. LA-ICP-MS zircon age dating gives intrusion 1948 ± 21 Ma, whereas SHRIMP U–Pb yields emplacement 1873 14 Ma. εHf(t) values are 3.5 9.7, −2.9 0.6. These data imply that depleted mantle environment, by reworking pre-existing crust material environment. detrital zircons ages ranging 3.06 1.85 Ga, peak concentration ca. 2.5 Ga. Previous studies suggested northern Nangnim underwent collision-related magmatism metamorphism at 1.93–1.90 then post-collisional 1.89–1.83 southern massif subduction-related 1.94–1.92 post-collision-related 1.84–1.78 By contrast, events were recognized ca 2.02–1.96 Ga 1.90–1.85 work, combined previous studies, suggests can be correlated rather than