Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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New Occurrence of Haengmae Formation in Taebaeksan Basin

태백산분지 내 새로운 행매층 분포 확인

  • Song, Yungoo (Department of Earth System Sciences, Yonsei University) ;
  • Park, Chaewon (Department of Earth System Sciences, Yonsei University) ;
  • Kim, Namsoo (Department of Earth System Sciences, Yonsei University) ;
  • Choi, Sung-Ja (Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Chwae, Ueechan (S/C Contemporary) ;
  • Kwon, Sanghoon (Department of Earth System Sciences, Yonsei University) ;
  • Jang, Yirang (Faculty of Earth System and Environmental Sciences, Chonnam National University)
  • Received : 2021.05.24
  • Accepted : 2021.06.19
  • Published : 2021.06.28
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Abstract

Pebble-bearing clastic carbonate rock which has been found in and around the Jeongseon and Okgye through the field survey was studied in petrological and mineralogical characteristics. We define the clastic carbonate rocks as 'Dolomite-pebble bearing fine sand-sized dolostone, or grainstone', which are characterized by the existence of dolomite single grains and Mg-phengite, and by the subsequent formation of secondary calcite cements. These attributes correspond well with those of the typical Haengmae Formation from Haengmae-dong, Mitan-myeon, Jeongseon-gun, thus the carbonate rocks in the Jeongseon and Okgye areas must belong to the Haengmae Formation. The result suggests that the Haengmae Formation is an independent unit among the Paleozoic lithostratigraphic units in Taebaek basin and lies in the upper part of Jeongseon and Sukbyungsan Formations under the Hongjeom Formation of Pyeongan Supergroup.

행매층은 정선석회암과 회동리층 사이에 위치하며 회동리층의 존재 및 지질시대를 결정하게 하는 중요한 역할을 하는 지층이다. 행매층의 분포조사를 통해 정선 및 옥계 일원에서 쇄설성 탄산염암이 확인되었으며 이들에 대한 암석학적 및 광물학적 특성을 규명하였다. 쇄설성 탄산염암의 암상 특성은 함돌로마이트역-미사질 백운암, 혹은 입자암(Dolomite-pebble bearing fine sand-sized dolostone, or grainstone)으로 정의할 수 있다. 광물조성 및 미세구조적 특징으로는 단결정 돌로마이트와 Mg-펜자이트의 존재, 그리고 입자 사이를 충진하는 교질물질로 나타나는 방해석의 생성이다. 이 같은 특성은 정선군 미탄면 행매동 일원의 전형적인 행매층의 특성과 일치하고 있어, 정선과 옥계 일원의 쇄설성 탄산염암이 행매층임을 지시한다. 본 연구결과는 태백산분지내에서 행매층은 독립 암층서단위일 뿐만 아니라 평안누층군 홍점층 직하부의 조선누층군인 정선석회암과 석병산석회암 상부에 분포하고 있음을 제시해 준다.

Keywords

Acknowledgement

본 연구는 한국지질자원연구원의 과학기술정보통신부 주요사업 "판내부 활성지구조 특성연구 및 단층 분절모델개발"(과제코드 GP2020-014/21-3116)의 일환으로 수행되었습니다. 그리고 이 논문을 읽고 비평과 교정을 해주신 익명의 심사위원님들에게 감사드립니다.

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