Dismembered mafic and serpentinized ultramafic bodies within the Hongseong suture zone of the Gyeonggi massif, southwestern Korean Peninsula are tectonically correlated with those from the Chinese Qinling-Dabie-Sulu collisional belt. We report sensitive high-resolution ion microprobe (SHRIMP) U-Pb zircon ages, detailed mineral compositions and whole rock geochemical data from the mafic rocks including eclogite and garnetite from the Hongseong suture zone. The zircon U-Pb data show multiple protolith ages corresponding to Neoproterozoic (ca. 815-770. Ma), Paleozoic (ca. 310. Ma) and Middle Triassic (ca. 240. Ma). The peak high-pressure and retrograde regional intermediate-pressure metamorphic events of Middle Triassic (ca. 240-230. Ma) are also recorded in zircons from the mafic rocks in the Hongseong suture zone. The ages and P-T estimates presented in this study match well with those of the peak ultra-high-pressure metamorphism in the Sulu area of China. Our results from the Hongseong suture zone provide important insights into the geodynamic history of the NE Asian region, with evidence for both Neoproterozoic subduction and a Paleozoic to Triassic subduction/accretion event.
Bibliographical noteFunding Information:
This work was supported as a Basic Research Project ( GP2012-3311-1 ; Tectonic Evolution of the Western Gyeonggi Block and Construction of a Geologic DB System) of the Korea Institute of Geoscience and Mineral Resources (KIGAM) , funded by the Ministry of Knowledge Economy, Korea . This research was also supported by 2012-8-0082 from KIGAM (GP2012-3311-1) to Sanghoon Kwon. We thank two anonymous reviewers for helpful comments. Suggestions by Editor-in-Chief A.C. Kerr led to considerable improvement of the final manuscript.
All Science Journal Classification (ASJC) codes
- Geochemistry and Petrology