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

Hyeong Soo Kim, Jin Han Ree, Hee Cheol Kang, Keewook Yi

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)489-516
Number of pages28
JournalJournal of Metamorphic Geology
Issue number3
Publication statusPublished - 2022 Apr

Bibliographical note

Funding Information:
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF‐2017R1D1A1B04028521) to H. S. Kim and a Korea University Grant. The authors thank Prof. Domingo Aerden and Ioan Sanislav for constructive suggestions that improved the manuscript. Prof. Clare Warren is thanked for her editorial direction and assistance.

Publisher Copyright:
© 2021 John Wiley & Sons Ltd


  • Korean peninsula
  • Permian–Triassic collisional orogeny
  • P–T–t–d paths
  • Taean Formation compositional layering
  • forearc deposits

ASJC Scopus subject areas

  • Geology
  • Geochemistry and Petrology


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