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Structural Geometry of the Seongjuri Syncline, Chungnam Basin
충남분지 성주리향사의 구조기하학적 해석
Econ. Environ. Geol. 2018 Dec;51(6):579-87
Published online December 31, 2018;  https://doi.org/10.9719/EEG.2018.51.6.579
Copyright © 2018 the Korean society of economic and environmental gelology.

Jungrae Noh1, Seung-Ik Park2* and Sanghoon Kwon1
노정래1 ·박승익2* ·권상훈1

1Department of Earth System Sciences, Yonsei University, Seoul 03722, Republic of Korea
2School of Earth System Science, Kyungpook National University, Daegu 41566, Republic of Korea
1연세대학교 지구시스템과학과, 2경북대학교 지구시스템과학부
Received September 8, 2018; Revised October 28, 2018; Accepted November 5, 2018.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
 Abstract
Chungnam Basin has been known as one of the largest Mesozoic basins in Korea, filled mainly with so-called Daedong Supergroup. The basin has evolved as the Early to Middle Jurassic intra-arc volcano-sedimentary basin developed on top of the Late Triassic to Early Jurassic post-collisional basin in this area, recording evolutionary history of the Mesozoic tectonics in the southwestern Korean Peninsula. This study carries out the geometric interpretations of the Seongjuri syncline and its surroundings in the central part of the Chungnam Basin, based on detailed structural field survey. Based on its doubly-plunging fold geometry, the Seongjuri syncline could be subdivided into the southwestern and northeastern domains. On the down-plunge profiles of the southwestern domain of the Seongjuri syncline as well as the underlying Okma fold, the Okma fault shows typical geometry of a basement-involved reverse fault that propagated up to the sedimentary cover. The profiles illustrate that the Seongjuri syncline occurs in front of the tip of the Okma fault, likely implying its origin as a part of the fault-related fold system. The result of this study will provide better insight into the structural interpretation of the Chungnam Basin, and will further provide useful information for the Mesozoic orgenic events of the southwestern Korean Peninsula.
Keywords : Chungnam Basin, Seongjuri syncline, Okma fault, down-plunge projection, basement-involved fault

 

April 2019, 52 (2)