경기육괴 서부 태안-서산-화성 지역 지구조 진화 연구 = Tectonic Evolution in the Taean-Seosan-Hwaseong Area, Western Gyeonggi Massif, Korean Peninsula

다국어 초록 (Multilingual Abstract)

The Taean–Seosan–Hwaseong area of the Gyeonggi Massif, Korean Peninsula, consists of Paleoproterozoic rocks, such as basement gneiss, intrusive units (hornblende-biotite gneiss and granodiorite gneiss), sedimentary rocks (metasedimentary rocks), and late-stage alkali-feldspar granitoids (metagranitoids). Age of basement gneiss(biotite gneiss), shows typical characteristics of gniesses within the Gyeonggi Massif. Later intrusive rocks (hornblende–biotite gneiss) show enrichment in light REEs, depletion in high field strength elements, and a calc-alkaline geochemical signature of volcanic arc origin, which consistent with the tectonic model of the South China Craton (SCC) during the Paleoproterozoic, constrained by previously reported ages of 1.92~1.90 Ga from the surrounding region. In contrast, the granodioritic gneiss, another intrusive unit, yielded a magmatic age of 1.88 Ga and shows calc-alkaline geochemical features originating from a volcanic arc; however, it is difficult to definitively correlate this unit with a specific model from either the North China Craton (NCC) or the SCC. The metasedimentary rocks exhibit a maximum depositional age ranging from 1.88 to 1.78 Ga. The diverse age distribution of detrital zircons reflects sedimentation from multiple provenance sources, whereas the rocks subsequently experienced metamorphism during later tectonothermal events. The alkali-feldspar granitoids(metagranitoids) intruding these sedimentary units are identified as shoshonitic A2-type granites formed in a within-plate environment, which is consistent with the tectonic model of the NCC during the corresponding period. In conclusion, the Taean–Seosan–Hwaseong area exhibits a mixture of tectonic models associated with both the NCC and SCC during the Paleoproterozoic, suggesting that this region may have been part of a tectonic system related to the Permo-Triassic collision between these two cratons. Future studies involving isotopic geochemistry and electron probe micro-analysis based pressure-temperature estimation are required for a more precise verification of the structural connectivity between the two cratons.

목차 (Table of Contents)

• 1. 서론(Introduction) 1
• 2. 일반지질(General geology) 5
• 3. 암석분류(Petrography) 12
• 4. 분석방법(Analytical method) 19
• 5. 지구화학(Geochemistry) 21
• 6. 지질연대(Geochronology) 51
• 7. 토의(Discussion) 68
• 8. 결론(Conclusion) 84
• 참고문헌(Reference) 86
• 국문 초록 99
• Acknowledgement 100
• 부록 표(Supplementary Table) 101