First Finding of Eclogite Facies Metamorphic Event in South Korea and Its Correlation with the Dabie‐Sulu Collision Belt in China
2005; University of Chicago Press; Volume: 113; Issue: 2 Linguagem: Inglês
10.1086/427671
ISSN1537-5269
AutoresChang Whan Oh, Sung Won Kim, Seon Gyu Choi, Mingguo Zhai, Jinghui Guo, K. Sajeev,
Tópico(s)earthquake and tectonic studies
ResumoMetabasite lenses occur within granitic gneiss at Bibong in the southwestern part of the Gyeonggi massif, South Korea. Bibong metabasites experienced an initial eclogite facies metamorphism (17.0–20.9 kbar, 835°–860°C), which was succeeded by a granulite facies metamorphism (11.5–14.6 kbar, 830°–850°C) and finally overprinted by an amphibolite facies metamorphism (6.7–11.0 kbar, 570°–740°C). The metabasites have Sm‐Nd internal isochron ages at 225–258 Ma, and the major elements of the metabasites display an island arc affinity. The petrochemical and geochronological data suggest the southwestern part of the Gyeonggi massif as an extension of the Triassic Dabie‐Sulu collision belt in China.
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