Tectonomagmatic evolution of a Jurassic Cordilleran flare-up along the Korean Peninsula: Geochronological and geochemical constraints from granitoid rocks

Cheong, Albert Chang-sik; Jo, Hui Je

doi:10.1016/j.gr.2020.06.025

Cited by 27 publications

(1 citation statement)

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“…240 to 230 Ma (Cho et al, 2017; Cho, Kim, Yang, & Yi, 2017), coeval with the emplacement of post‐collisional igneous rocks in the Gyeonggi Massif ( c . 236–219 Ma; Cheong et al, 2015; Cheong & Jo, 2020; Cho, Kim, Lee, Horie, & Hidaka, 2008, and references therein). Cho et al (2017) suggested that this diachronicity of peak metamorphic ages between the Gyeonggi Massif and Gyeonggi Marginal Belt probably indicates different initiation times of Triassic regional metamorphism.…”

Section: Geological Settingmentioning

confidence: 99%

Pressure–temperature–time–deformation (P–T–t–d) path for Devonian forearc deposits in the Imjingang Belt, South Korea: Implications for Permian–Triassic collisional orogenesis on the eastern margin of Eurasia

Kim

Ree

Kang

et al. 2021

Journal Metamorphic Geology

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The Taean Formation on the central western margin of the Korean Peninsula contains layered metapelite, quartzo‐feldspathic schist, amphibolite, calcsilicate, and impure marble. The layering was formed by tectonic transposition of the original bedding. The formation has lithologic and isotopic age signatures similar to those of metasedimentary rocks of the Imjingang Belt, which is the eastern extension of the Qinling–Dabie–Sulu Belt, and the depositional age of the formation can be constrained to the Late Devonian. The metamorphic pressure–temperature (P–T) path for the formation is characterized by a high ΔP/ΔT prograde part and subsequent near‐isothermal decompression with peak P–T conditions of 600–620°C and 9.0–10.5 kbar, based on observations of mineral assemblages and phase equilibria modelling. Strong compressional deformation (Dn) produced a N–S‐trending Sn foliation that transposed the earlier Sn–1 and isoclinal Fn folds and was coeval with an episode of medium‐ to high‐pressure amphibolite‐facies metamorphism. The NNE–SSW‐trending left‐lateral Ryeseonggang Fault played a key role in producing the N–S distribution of the metamorphosed forearc deposits along the western coast of the Korean Peninsula. The peak metamorphism and deformation occurred during the early Permian to Early Triassic (276–250 Ma), with retrogression taking place during the Late Triassic (c. 230 Ma), as inferred from new U–Pb zircon age data and previous titanite and muscovite ages for the formation. The clockwise P–T–t (time)–d (deformation) path for the Taean Formation indicates rapid burial during Dn followed by rapid exhumation during the Permian–Triassic collision between the Qinling microcontinent and the North China Craton.

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