Petrography, Cr-spinel Chemistry, and Whole Rock Geochemistry of the Cretaceous Icheonri Formation in Korea : Implications for Provenance and Tectonic Setting = 암석학적 특성 및 크롬 첨정석, 전암 지화학 조성을 이용한 백악기 이천리층의 기원지 연구

목차 (Table of Contents)

• 1. Introduction 1
• 2. Geological setting 3
• 2.1 Gyeongsang Basin 3
• 2.2 Study area 9
• 3. Materials and methods 12
• 3.1 Sample collection 12
• 3.2 Petrographic analysis of sandstones 16
• 3.3 Electron microprobe analysis of detrital chromian spinels 17
• 3.4 Whole-rock geochemical analysis 18
• 4. Results 19
• 4.1 Sandstone petrography 19
• 4.1.1 Detrital components and textures 19
• 4.1.2 Modal composition 26
• 4.2 Detrital chromian spinel chemistry 30
• 4.3 Whole-rock geochemistry 35
• 4.3.1 Major elements 35
• 4.3.2 Trace elements 42
• 4.3.3 Rare earth elements 49
• 5. Discussion 61
• 5.1 Source composition 61
• 5.2 Tectonic setting 69
• 5.3 Implications for ultramafic sources 73
• 5.3.1 Geochemical characteristics and tectonic significance of detrital chromian spinels from the Icheonri Formation 73
• 5.3.2 Interpreting the spatial and temporal distribution of forearc peridotite in the Gyeongsang Basin 78
• 5.4 Provenance of the Icheonri Formation 83
• 5.5 Implications for the regional stratigraphic development and correlation with the Gyeongsang Supergroup 86
• 6. Conclusions 93
• REFERENCES 95
• ABSTRACT (in Korean) 111