Development and timing of two orthogonal fold systems in the western gyeonggi massif, korea
- Authors
- Kim, H.S.; Kang, H.-C.; Lim, H.S.; Lee, S.
- Issue Date
- 6월-2021
- Publisher
- International Union of Geological Sciences
- Citation
- Episodes, v.44, no.2, pp.83 - 97
- Indexed
- SCIE
SCOPUS
- Journal Title
- Episodes
- Volume
- 44
- Number
- 2
- Start Page
- 83
- End Page
- 97
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/128820
- DOI
- 10.18814/epiiugs/2020/020070
- ISSN
- 0705-3797
- Abstract
- We present the deformation history based on analysis of two orthogonal fold phases and U-Pb zircon geochronology of metasedimentary and igneous rocks from the western Gyeonggi Massif (Gukhwado and Ippado areas) in the Korean Peninsula. Multiple generations of folds are recognized in three lithological units: (1) a psammitic/pelitic unit consisting of quartz-mica schist and quartzite, (2) a calcareous unit consisting of calcareous schist and calcsilicate, and (3) a mafic unit consisting of amphibolite with and without garnet porphyroblast. These rocks are intruded by a Triassic syenite. First-generation folds (Fn) are tight to isoclinal, oriented N-S, and have both shallow and steep fold axes. The Fn folds include asymmetric and buckle folds that are refolded by vertical Fn+1 folds. The latter are oriented ∼E-W, approximately orthogonal to the earlier folds. We infer from U-Pb zircon ages of the psammitic/ calcareous units and the syenite that the two superimposed folding phases associated with crustal-thickening and shearing in the western Gyeonggi Massif occurred between the Pennsylvanian and the Middle Triassic (∼228 Ma). © 2021 International Union of Geological Sciences. All right reserved.
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