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- W2032048614 abstract "Abstract The signature of a prolonged subduction–accretion history from Paleozoic to Early Mesozoic is preserved within the dismembered serpentinite melanges within the Hongseong suture. Here we present major and trace element data from the mafic fragments/blocks within the Baekdong serpentinite melange revealing their arc-like tholeiite affinity within a suprasubduction zone tectonic setting. Chromian spinel compositions from the Baekdong hydrated mantle peridotite (serpentinite) are characterized by high Cr# (0.53–0.67) and Fe 2+ /Fe 3+ ratio, medium Mg# (0.42–0.55), and Al 2 O 3 contents (17–25 wt.%) indicating a forearc tectonic environment for the hydrated mantle peridotite. The estimated melting degree (> 17.6%) and FeO/MgO of the parental melt (0.9–1.3) are consistent with that of forearc magmas. SHRIMP zircon U–Pb ages from a high-grade mafic rock and an anorthosite from the study area give protolith ages of ~ 310 Ma and ~ 228 Ma, respectively. Zircons from an associated orthogneiss block within the melange yield a Neoproterozoic crystallization age of ~ 748 Ma. These results, together with the recent SHRIMP zircon ages from other dismembered serpentinite melanges within the Wolhyeonri complex, suggest that Paleozoic to Early Mesozoic subduction and subsequent collision events led to the exhumation of the hydrated forearc mantle peridotites from a metasomatized mantle wedge. The Hongseong region preserves important clues to a long-lived subduction system related to global events associated with the final amalgamation of the Pangaea supercontinent." @default.
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- W2032048614 date "2011-11-01" @default.
- W2032048614 modified "2023-09-27" @default.
- W2032048614 title "Forearc serpentinite mélange from the Hongseong suture, South Korea" @default.
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- W2032048614 doi "https://doi.org/10.1016/j.gr.2011.01.012" @default.
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