Continental origin of the Bibong eclogite,southwestern Gyeonggi massif,South Korea |
| |
| Institution: | 1. Department of Earth and Environmental Sciences, The Earth and Environmental Science System Research Center, Chonbuk National University, Jeonju 561-756, South Korea;2. Korea Basic Science Institute, Jeonju Center, Jeonju 561-712, South Korea;3. Geochronology Team, Korea Basic Science Institute, Chungbuk 363-883, South Korea;1. School of Earth and Environmental Sciences, Seoul National University, Seoul 08826, Republic of Korea;2. Department of Earth and Environmental Sciences, Chungbuk National University, Cheongju 28644, Republic of Korea;1. Geological Research Division, Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, Republic of Korea;2. Department of Earth System Sciences, Yonsei University, Seoul 120-749, Republic of Korea;3. Division of Earth and Environmental Science, Korea Basic Science Institute, Chungbuk 363-883, Republic of Korea;4. School of Earth Sciences and Resources, China University of Geosciences, Beijing, 29 Xueyuan Road, Beijing 100083, China;5. Department of Earth and Environmental Sciences, Korea University, Seoul 02841, Republic of Korea |
| |
| Abstract: | Eclogite is a high-pressure (HP) metamorphic rock that provides important information about the subduction of both continental and oceanic crusts. In this study we present SHRIMP zircon U–Pb isotopic data for a suite of the basement gneisses to investigate the origin of the Proterozoic Bibong eclogite in the Hongseong area, South Korea. Zircon grains from the basement felsic gneisses yielded Paleoproterozoic protolith ages ranging from ca. 2197 to 1880 Ma, and were intruded by syenite at ca. 750 Ma. A HP regional metamorphic event of Triassic age (ca. 255–227 Ma) is recorded in the zircon rims of the country rocks, which is also observed in the zircons from the eclogite. The contacts between the Bibong eclogite and its host rocks support an origin for the Proterozoic protoliths, indicating continental intrusions. The Hongseong area thus preserves evidence for the Triassic collision, indicating a tectonic linkage among the northeast Asian continents. |
| |
| Keywords: | Bibong eclogite Continental origin Rodinia Triassic collision Zircon geochronology |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
