Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Gravity Anomaly around Boam Deposit, Uljin: Implications on Economic Geology

울진 보암광상 일대 중력 이상: 광상학적 함의

  • Oh, Il-Hwan (Critical Minerals Research Center, Korea Institute Geoscience and Mineral Resources) ;
  • Heo, Chul-Ho (Critical Minerals Research Center, Korea Institute Geoscience and Mineral Resources) ;
  • Shin, Young-Hong (Active Tectonics Research Center, Korea Institute Geoscience and Mineral Resources)
  • 오일환 (한국지질자원연구원 희소금속광상연구센터) ;
  • 허철호 (한국지질자원연구원 희소금속광상연구센터) ;
  • 신영홍 (한국지질자원연구원 활성지구조연구센터)
  • Received : 2022.09.21
  • Accepted : 2022.10.20
  • Published : 2022.10.28
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Abstract

Gravity exploration was conducted to determine the distribution of igneous complex related to lithium pegmatite in the Boam deposit of Uljin, Gyeongsangbuk-do, and the spatial relationship with the regional geology and ore bodies were studied. The gravity exploration result shows that the Boam deposit area is characterized by relatively low gravity anomaly that surrounds the deposit. The Boam deposit is located near the southwest-northeast directional boundary of gravity anomalies where igneous complex (granite gneiss) contacts with the Yuli and Wonnam groups in the southeast, Janggun limestone layers in the east-west direction, and Dongsugok metasedimentary rocks. While the western boundary in the southwest-northeast direction is relatively clear, there may also be unknown igneous complex that are not exposed on the surface at the eastern and southern boundaries because a relatively low gravity anomaly surrounds the deposit. The distribution characteristics of these hidden igneous complex will be used as useful data for predicting the distribution of the lithium pegmatite in the future.

경상북도 울진 보암광상 일대에서 리튬 페그마타이트와 관련된 화성암체의 분포를 파악하기 위해 중력탐사를 실시하고, 주변 지질 및 광체와의 공간적 관계를 연구하였다. 중력탐사 결과 보암광상 주변은 상대적으로 낮은 중력이상을 나타내고 있다. 보암광상은 남서-북동 방향으로 길게 분포하는 화성암체(분천화강편마암)와 남동쪽의 율리층군 및 원남층군, 동서 방향의 장군석회암층 및 동수곡층 퇴적암과 만나서 이루는 남서-북동 방향의 중력이상 경계 인근에 위치하고 있다. 이러한 남서-북동 방향의 서쪽 경계가 상대적으로 뚜렷하기는 하지만, 이외에도 광상 주변으로 동쪽과 남쪽 경계에서도 상대적으로 낮은 중력이상이 둘러싸고 있기 때문에 이곳에서도 주변으로 지표에 드러나지 않은 화성암체가 분포하고 있을 수 있다. 중력탐사를 통해 추정되는 잠두 화성암체의 분포 특성은 추후 리튬 페그마타이트의 분포와 규모를 예측하는데 유용한 자료로 활용될 것이다.

Keywords

Acknowledgement

본 연구는 한국지질자원연구원 주요사업인 '국내 바나듐(V) 등 에너지 저장광물 정밀탐사기술 개발 및 부존량 예측(GP2022-008)'과제로 수행되었습니다. 바쁘신 와중에도 이 연구논문의 미비점을 지적, 수정하여 주신 책임편집위원님과 심사위원님들께 깊이 감사를 드립니다.

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