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논문 기본 정보

자료유형
학위논문
저자정보

이상봉 (전북대학교, 전북대학교 일반대학원)

지도교수
오창환
발행연도
2016
저작권
전북대학교 논문은 저작권에 의해 보호받습니다.

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이 논문의 연구 히스토리 (3)

초록· 키워드

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The Yangyang and Odesan (Odesan metamorphic complex; OMC) areas are located in the eastern Gyeonggi Massif in the Korean Peninsula. The Yangyang-OMC area has undergone polyphase metamorphism since the early Paleoproterozoic, and two tectono-thermal events are recognized, a late Paleoproterozoic orogenic event and a late Permian to Triassic (Permo-Triassic) orogenic event. The Paleoproterozoic metamorphic evolution (intermediate-P/T type) is defined as upper amphibolite- to granulite-facies metamorphism during ca. 1.92-1.88 Ga, which was followed by a transition to a low-P/T type metamorphism with higher temperature related to magmatism at ca. 1.85 Ga. This Paleoproterozoic orogeny is characterized by continent-continent collision process from the higher-pressure M1 stage (possibly at ca. 1.92 Ga) to the M2 migmatization stage (ca. 1.88 Ga) and finally to the post-collisional M3 stage (ca. 780 ˚C and 4.6-5.2 kbar at ca. 1.85 Ga).
Various sedimentary and igneous rocks that formed between Mesoproterozoic and Paleozoic era crop out in the eastern OMC. These rocks were metamorphosed during the Permo-Triassic period. The Permo-Triassic metamorphic evolution, intermediate-P/T type metamorphism, identified from the basement gneisses and the Mesoproterozoic to Paleozoic rocks is characterized by the syn-collisional M1 stage (ca. 640 ˚C and 7.0-8.0 kbar at ca. 250 Ma), the post-collisional M2 stage (680-700 ˚C and ca. 4.0 kbar at ca. 230 Ma) and the retrograde M3 stage. Triassic (ca. 230 Ma) mafic to intermediate intrusive rocks are widely exposed in the study area and indicate their highly enriched mantle sources. This magmatism is interpreted to be post-collisional igneous activity. Consequently, the Permo-Triassic metamorphic and igneous events are interpreted to be a result of continent-continent collision between the North China Craton and South China Craton.

목차

Introduction 1
Regional Geology 4
Analytical Methods 6
Chapter 1. The Late Paleoproterozoic Metamorphic and Igneous Events 11
1.1. Field occurrence 12
(1) Yangyang area 12
(2) Odesan area (Odesan metamorphic complex, OMC) 13
1.2. Petrography 22
(1) Yangyang area 22
1) Basement gneisses 22
2) Metagranodiorites 22
(2) Odesan metamorphic complex (OMC) 23
1) Basement gneisses 23
2) Metagranodiorite 24
1.3. Geochronology, SHRIMP zircon U-Pb dating 28
(1) Yangyang area 28
1) Paragneiss (Migmatitic gneiss) 28
2) Metagranodiorites 31
(2) Odesan metamorphic complex (OMC) 37
1) Paragneiss (banded gneiss) 37
2) Paragneiss (migmatitic gneiss) 38
(3) Bongpyeong area 47
(4) Summary 50
1.4. Metamorphic P-T estimation 52
(1) Yangyang area 53
(2) Odesan metamorphic complex (OMC) 62
(3) Summary and Disccusion (Paleproterozoic Metamorphic P-T path) 62
1.5. Zircon Lu-Hf isopotes 69
1.6. Whole-rock geochemistry 76
1.7. Discussion: Paleoproterozoic tectonic evolution of the eastern Gyeonggi Massif 85
Chapter 2. The Occurrence of the Mesoproterozoic to Paleozoic Sedimentary and Igneous Rocks and the Permo-Triassic Metamorphism 90
2.1. Field occurrence 91
(1) Odesan metamorphic complex (OMC) 91
(2) Yangyang area 94
2.2. Petrography 100
(1) Odesan metamorphic complex (OMC) 100
1) Mesoproterozoic to Paleozoic Units (MPU) 100
2) Metamafic rocks (metamorphosed mafic intrusives) 101
3) Gabbro and mangerite (unmetamorphosed rocks) 102
(2) Yangyang area 107
2.3. Geochronology, SHRIMP zircon U-Pb dating 109
(1) Odesan metamorphic complex (OMC) 109
1) Mesoproterozoic to Paleozoic Units (MPU) 109
2) Metamafic rocks (metamorphosed mafic intrusives) 113
3) Post-collisional mafic to intermediate intrusives 115
(2) Yangyang area 130
2.4. Geochronologic summary 134
(1) The occurrence of the Mesoproterozoic to Paleozoic sedimentary and igneous rocks 134
(2) Permo-Triassic metamorphism 135
2.5. P-T estimation for Permo-Triassic metamorphism 138
2.6. Whole-rock geochemistry for Triassic intrusives 153
2.7. Discussion 164
2.7.1. Triassic mafic magmatism and their significance 164
2.7.2. Permo-Triassic tectonic evolution of the Odesan (OMC)-Yangyang area 167
Conclusions 178
References 180
Appendix tables 197
Acknowledgements 201
Abstract (in Korean) 202

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