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Geochemical and Geochronological Studies on Metaigneous Rocks in the Gyemyeongsan Formation, Northwestern Okcheon Metamorphic Belt and their Tectonic Implication  

박종길 (고려대학교 지구환경과학과)
김성원 (전북대학교 기초과학연구소)
오창환 (전북대학교 지구환경과학과)
김형식 (고려대학교 지구환경과학과)
Publication Information
The Journal of the Petrological Society of Korea / v.12, no.4, 2003 , pp. 155-169 More about this Journal
Abstract
In the northwest Okcheon metamorphic belt, the metaigneous rocks in the Gyemyeongsan Formation have wider chemical ranges for major, trace and REE elements compared with metaigneous rocks in the Munjuri Formation and do not represent bimodal igneous activity which is characteristic for a continental rifting. The metaigneous rocks in the Munjuri Formation are regarded as products of single magmatic evolution, whereas those in the Gyemyeongsan Formation may be formed through multiple magmatic episodes. The felsic metavolcanic rocks in the Gyemyeongsan Formation show weaker Eu negative anomalies compared with those in the Munjuri Formation but those in both formations show similar degrees of enrichment from LREE to HREE. The metabasites in the Munjuri Formation do not show Eu anomalies but those in the Gyemyeongsan Formation show both positive and negative Eu anomalies(0.59
Keywords
Okcheon metamorphic belt; metaigneous rocks; intracontinental rift; bimodal igneous activity; SHRIMP zircon U-Pb concordia age;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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