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

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 si...

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Bibliographic Details
Published in:Journal of metamorphic geology 2022-04, Vol.40 (3), p.489-516
Main Authors: Kim, Hyeong Soo, Ree, Jin‐Han, Kang, Hee‐Cheol, Yi, Keewook
Format: Article
Language:English
Subjects:
Age
Amphibolites
Belts
Cratons
Decompression
Deformation
Devonian
forearc deposits
Isotopes
Korean peninsula
Metamorphism
Metamorphism (geology)
Mica
Mineral assemblages
Muscovite
Permian
Permian–Triassic collisional orogeny
Phase equilibria
Pressure
P–T–t–d paths
Schist
Schists
Sedimentary facies
Taean Formation compositional layering
Tectonics
Temperature
Titanite
Transposition
Triassic
Zircon
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Summary: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.
ISSN:0263-4929
1525-1314
DOI:10.1111/jmg.12636