Architecture and tectonic development of the Yeonghae basin, eastern margin of the Korean peninsula
- Alternative Title
- 한반도 동부에 위치하는 영해 분지의 아키텍쳐 와 지구조
- Abstract
- The Yeonghae depression is located in the zone of the Yangsan fault system, a potentially active fault system in the Republic of Korea and has been interpreted as a basin. Thus, the study of the architecture and tectonic evolution of the Yeonghae basin is important to interpret the basin formation mechanism and to enhance our understanding of the Yangsan fault system.
For this study, we carried out remote sensing data analysis and structural geology fieldwork. Digital Elevation Model (DEM) was used to highlight the depression area, marginal faults, and major structures in the study area. structural geology fieldwork was performed to understand the nature of the bounded faults and to collect structural data. Remote sensing analysis reveals that the study area is clearly depressed in comparison to the surrounding area, the depression is extended in NNE-SSW and bounded by three major lineaments. The fieldwork indicated that the eastern bounded fault is right-lateral strike-slip fault dipping steeply to the east, representing the northern extension of the Yangsan fault segment. Whereas the western margin is bounded by an oblique right-lateral strike-slip fault associated with normal faults. The kinematics indicators along the strike-slip marginal faults demonstrate that these faults have been experienced both sinistral and dextral strike-slip movements.
The architectures of the Yeonghea depression structures suggested that the basin was developed as a pull-apart basin during the left-lateral movement of Yangsan fault, under the NNW-SSE compression which was occurred in the late-Miocene. Later on, the bounded faults reactivated as right-lateral strike-slip faults due to the change in the compression stress direction to ENE-WSW-to-E-W. Consequently, the basin started closing and uplifting.
This study enables us to classify Yeonghae depression as an inverted pull-apart basin. Moreover, two opposite strike-slip movements along the major marginal faults indicate multiple deformations of the Yangsan fault system developed along the eastern margin of the Korean peninsula.
- Issued Date
- 2020
- Awarded Date
- 2020. 2
- Type
- Dissertation
- Publisher
- 부경대학교
- Affiliation
- Pukyong National University, Graduate School
- Department
- 대학원 지구환경과학과
- Advisor
- Young-Seog Kim
- Table Of Contents
- I.Introduction 1
1.1 Overview 1
1.2 Location of the study area 4
1.3 Physiography 5
1.4 Drainage patterns 5
1.5 Objectives of this study 5
1.6 Methodology 7
1.6.1 Remote sensing 7
1.6.2. The structural geology fieldwork 7
1.6.3. Electrical resistivity tomography (ERT) 9
II.Remote sensing 10
2.1 Introduction 10
2.2 Lineament analysis 11
2.3 Digital elevation models (DEMs) 13
2.3.1 Types of DEMs 14
2.3.2 DEMs data sources 15
2.3.3 ASTER GDEM characteristics 16
2.4 Data Processing 17
III.Geological background 22
3.1 Tectonic setting 22
3.2 The Stratigraphy 25
3.2.1 Basement rocks 28
3.2.1.1 Precambrian gneiss and metasedimentary rocks 28
3.2.1.2 Yeongdeok granite (Pre-Kyongsang Jurassic granite) 28
3.2.1.3 Cretaceous rocks units 30
3.2.1.3.1 Sindong Group 30
3.2.1.3.1.1 Kyongjongdong Formation 30
3.2.1.3.2 Hayang Group 30
3.2.1.3.2.1 Ullyonsan Formation 30
3.2.1.3.2.2 Donghwachi Formation 31
3.2.1.3.2.3 Kasongdong Formation 32
3.2.1.4 Yuchon volcanic Group 32
3.2.2 The Basin Fills units 32
3.2.2.1 Early Cenozoic Volcanic Rocks 32
3.2.2.2 The Tertiary sedimentary rocks 33
3.2.2.3 The Quaternary sediments 33
IV.Results 35
4.1 Remote sensing 35
4.2 Structural geology fieldwork 42
4.2.1. The eastern bounded fault (Fault (A)) 42
4.2.2. The western bounded faults 44
4.2.3. Intra-basinal structures 60
4.2.3.1. Bedding 60
4.2.3.2. Dikes 60
4.2.3.3. Faults 64
4.2.3.4. Joints 64
4.3. Electrical Resistivity Tomography surveys (ERT) 66
4.4. Paleostress analysis 72
4.4.1. Outcrop Description 72
4.4.1.1. Outcrop (A) 73
4.4.1.2. Outcrop (B) 77
V.Discussion 82
5.1. Basin Architecture 82
5.2. Basin evolution history 85
VI.Conclusion 88
References 90
Acknowledgments 101
- Degree
- Master
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