Protracted late Paleozoic volcanic arc activity along the Northeast Asian continental margin.

ABSTRACT: Northeast Asia is a complex tectonic collage bounded by Paleozoic-Mesozoic internal and peripheral orogens, whose distribution and continuity are obscured by later deformation and magmatic overprinting. Here we present zircon data from granites and xenoliths in the Yeongdeok area, southeastern Korea, which suggest the presence of a long-lived (ca. 30 Myr) late Paleozoic volcanic arc system. Zircon cores yield U-Pb ages of 278-255 Ma, while rim ages cluster around 250 Ma, corresponding to the emplacement of the Yeongdeok adakite pluton and associated hydrothermal alteration. The ¹⁸O depletion (δ¹⁸O = 4.7-0.6‰) observed in many zircons, along with core-to-rim decreases, is interpreted as the result of recycling of hydrothermally altered volcanic carapace material. Negat

SUBMITTER: Kim HS 

PROVIDER: S-EPMC12572273 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature