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논문 기본 정보
- 자료유형
- 학술대회자료
- 저자정보
- 발행연도
- 2021.10
- 수록면
- 211 - 211 (1page)
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In this study, igneous and metamorphic activities occurred in the Yongdu-ri area in the northern Gyeonggi Massif(GM), are studied with their application to an interpretation on the tectonic evolution. The study area consists of the Yongduri Group (YG), the Jangrak Group (JG), and the Gapyong Formation (GF). The YG consists of banded gneiss and amphibolite-bearing banded gneiss. The JG is mainly composed of quartzite, biotite gneiss, and banded gneiss. The GF is mainly composed of meta-calcsilicate, marble, biotite gneiss, and meta-trachyandesite with minor serpentinized ultramafic blocks and hornblende biotite gneiss slab. The banded gneiss (GP 190919-1B) in the YG gave intrusion age of ca. 2.58 Ga and metamorphic age of ca. 1.90 Ga. This rock can be classified as granodiorite with high-K calc-alkaline characters and are plotted in the I-type granite field and VAG field. The biotite gneiss (GP190919-4, 200515-1) in the JG, also gives an intrusion age of ca. 2.51 Ga, but does not give clear metamorphic age. This rock can be also classified as granodiorite but is classified as the A2 type granite. The existence of the I-type and A2-type granitoids indicate that the tectonic setting of the study area at ca. 2.58-2.51 Ga may be a back-arc basin. O ... 전체 초록 보기
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