Browse > Article

Geological Structure around Andong Fault System, Pungcheon-myeon, Andong, Korea  

Kang, Ji-Hoon (Department of Earth and Environmental Sciences, Andong National University)
Lee, Duck-Seon (Department of Earth and Environmental Sciences, Andong National University)
Publication Information
The Journal of the Petrological Society of Korea / v.17, no.2, 2008 , pp. 83-94 More about this Journal
Abstract
The Pungcheon-myeon, Andong, consists mainly of Precambrian metamorphic rocks, Jurassic igneous rocks, Cretaceous sedimentary rocks (Hasandong, Jinju and Iljik Formations) and Cretaceous igneous rocks (gabbroic rocks, dykes), in which several major faults are developed; Andong fault of ENE trend, which is the boundary fault of the Cretaceous Gyeongsang Basin and the Precambrian-Jurassic basement (Yeongnam Massif), Namhu fault parallel to it, Maebong fault of NNW direction, bow-shaped Gwangdeok fault of ENE direction which is convex toward SSE direction, and Hahoe fault of NNE direction. This paper is researched the geological structures around these major faults by means of the detailed geometric analysis on beddings, joints, faults and drag folds. As a result, a reverse slip faulting of top-to-the SSE movement accompanied with a regional drag folding is recognized from the arrangement of bedding poles measured around the Gwangdeok and Hahoe faults at its northeastern extension, and a zone of Gwangdeok drag fold of 150-300 m width, which is wider at the central and eastern parts of Gwangdeok fault and narrower at its western part and Hahoe fault, is also defined. It indicates that the Hahoe and Gwangdeok faults are a single fault and their movements are coeval unlike the results of earlier reasearchers. And, In this area are recognized two types of faults [(E)NE${\sim}$EW(fault I), WNW${\sim}$NNW (fault II), trending faults] and four types of joints [EW (I), (N)NW (II), NNE (III), NE (IV) trending joints]. These fractures were formed at least through four different events, named as Dn to Dn+3 phases. (1) Dn phase; the formation of joint (I) (Gwangdeok joint) and the intrusion of acidic dykes of EW trend under the compression of EW direction. (2) Dn+1 phase; the formations of joint (II) (Maebong joint), lens-shaped boudinage of acidic dykes, oblique-slip reverse fault (Fault I-Gwangdeok fault) under the compression of (N)NW direction, and the formation of regional zone of Gwangdeok drag fold accompanying the Gwangdeok faulting. (3) Dn+2 phase; those of joint (III), Fault II (Maebong fault) by dextral strike-slip movement of Maebong joint under the compression of NNE direction, and the extension cutting of Dn+1 structures due to the Maebong faulting. (4) Dn+3 phase; the jointing (IV) and the reactivation of Fault II as oblique-slip type with predominant dextral motion which took place under the compression of NE direction. It also suggests that the Maebong fault is not a tear fault deveolped during thrust tectonics of the Andong and Gwangdeok faults but is a post-fault during different tectonic event.
Keywords
Gyeongsang Basin; Hahoe Village; Andong Fault System; Gwangdeok Fault; Geological Structures;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 강지훈, 류충렬, 2006, 경상분지 의성지괴 길안면지역에서 청송화강암의 단열 발달사 및 운동성에 대한 기하학적 해석. 암석학회지, 15, 180-193   과학기술학회마을
2 김옥준, 1975, 남한의 화강암류와 지각변동. 광산지질, 8, 223-230
3 최범영, 최현일, 이승렬, 황재하, 고인세, 1999, 안동단층계 의 운동특성과 운동시점. 대한지질학회, 한국석유지질학 회, 한국암석학회 제54차 추계공동학술발표회 초록집, 58
4 Peacock, D.C.P., 2001, The temporal relationship between joint and faults. Journal of Structural Geology, 23, 329- 341   DOI   ScienceOn
5 윤석규, 차문성, 김정진, 이종덕, 1988, 한국지질도(1:50,000) 예천도폭 및 설명서. 한국동력자원연구소, 12p
6 김봉균, 이하영, 김수진, 정지곤, 1988, 한국지질도(1:50,000) 안동도폭 및 설명서. 한국동력자원연구소, 20p. 김옥준, 1975, 남한의 화강암류와 지각변동. 광산지질, 8, 223-230
7 장기홍, 1975, 한반도 동남부의 백악계 층서. 지질학회지, 11, 1-23
8 Reedman, A. and Um, S.H., 1975, Geology of Korea, Geol. Min. Inst. Korea, Seoul, 293p
9 Engelder, T. and Gross, M.R., 1993, Curving cross joints and the lithospheric stress field in eastern North America.Geology, 21, 817-820   DOI   ScienceOn
10 최위찬, 김규봉, 홍승호, 이병주, 황재하, 박기화, 황상기, 최 범영, 송교영, 진명식, 1995, 한국지질도 1: 1,000,000. 한국자원연구소, 성지문화사
11 Choi, P.Y., Lee, S.R., Choi, H.I., Hwang, J.H., Kwon, S.K., Ko, I.S, An, G.O., 2002, Movement history of the Andong Fault System: Geometric and tectonic approaches. Geosciences Journal, 6, 91-102   DOI   ScienceOn