Journal of the Geological Society of Korea (지질학회지)

The Geological Society of Korea (대한지질학회)
권호 표지

Upper Ordovician and Silurian deposits in the Pyeongnam Basin: Sangsori and Koksan series

평남분지의 하부와 중부 고생대층: 상서리통과 곡산통

  • Lee, Dong-Jin (Department of Earth & Environmental Sciences, Andong National University) ;
  • Choi, Yong-Mi (Department of Earth & Environmental Sciences, Andong National University) ;
  • Lee, Dong-Chan (Department of Earth Science Education, Chungbuk National University) ;
  • Lee, Jeong-Gu (Exhibition Planning and Coordination Division, Gwacheon National Science Museum) ;
  • Kwon, Yi-Kyun (Department of Geoenvironmental Sciences, Kongju National University) ;
  • Cao, Lin (College of Earth Science, Jilin University) ;
  • Choh, Suk-Joo (Department of Earth and Environmental Sciences, Korea University)
  • 이동진 (안동대학교 지구환경과학과) ;
  • 최용미 (안동대학교 지구환경과학과) ;
  • 이동찬 (충북대학교 지구과학교육과) ;
  • 이정구 (국립과천과학관) ;
  • 권이균 (공주대학교 지질환경과학과) ;
  • 조림 (중국길림대학 지구과학학원) ;
  • 조석주 (고려대학교 지구환경과학과)
  • Published : 2013.04.30
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Abstract

In the early 1970s, Silurian corals were found from the upper part of the Mandal Series in the Suan-Koksan-Singye areas, Hwanghaebuk-do, which has previously been considered as the Middle Ordovician in age. The discovery led to the designation of the Koksan Series, and the subsequent finding of Agetolites from the base of the Koksan Series in 1975 paved way for the recognition of the Sangsori Series. Corals of the Sangsori Series show the remarkable resemblance to those in the border area between the Jiangxi and Zhejiang provinces of southeastern China. This similarity strongly suggests intimate paleobiogeographic relationship between the two areas. The corals of the Koksan Series mainly consists of tabulates and are compositionally similar to those of the Silurian corals in the clasts of Early Jurassic (?) Songrim Conglomerate. These corals of the Sangsori and Koksan series are not previously known from the Sino-Korean Platform and are instead comparable to those of the South China fauna known for its endemic characteristics. The normal marine carbonate deposits of the Sangsori and Koksan series contrast the origin of the Songrim Conglomerate which resulted from erosion and deposition of Silurian to Devonian (?) strata during the Early Jurassic. North Korean geologists postulated the existence of a narrow seaway of the "Miru" and "Koksan-Songrim" seas extending from the South China to Pyongnam Basin as the main depocenter of the Sangsori and Koksan series. On the other hand, South Korean geologists do not rule out the possibility that these are the remnant of the Late Permian to Trassic collision between the Sino-Korean and South China blocks. It warrants a detailed regional stratigraphic correlation between the two Koreas in order to fully comprehend the Phanerozoic crustal evolution and accretional processes of the east Asian continent.

1970년대 초 평남분지의 중심에 위치하는 황해북도 수안-곡산-신계 지역에서 지질도 작성을 위한 조사과정 중 그동안 오르도비스기 중기층으로 알려져 있던 만달통의 상부에서 사일루리아기를 지시하는 산호화석을 인지하고 이 화석들을 포함한 층을 분리하여 곡산통으로 명명하였다. 이후 1975년 곡산통의 하부에서 오르도비스기 후기를 지시하는 Agetolites를 찾아 이를 상서리통으로 분리하였다. 상서리통의 산호화석들은 남중국 강서성-절강성 경계부 일원에 분포된 오르도비스기 후기층에서 흔히 산출되는 종들과 종구성과 분류군별 산출량에서 유사하여 양 지역 사이의 가까운 고지리적 유연관계을 보여준다. 곡산통의 화석은 주로 상판산호로 구성되어 있으며, 1930년대 송림역암에서 산출된 사일루리아기 산호와 유사한 조성을 가진다. 이러한 상서리통과 곡산통의 산호 화석은 지금까지 한중대지 지역에서 보고된 바 없으며, 대부분의 분류군에서 남중국동물군의 특징적 요소를 가지는 것으로 평가된다. 상서리통과 곡산통은 탄산염암 위주의 상부 오르도비스기-사일루리아기 퇴적층으로, 사일루리아기-데본기(?)의 퇴적층으로부터 공급되어 퇴적된 주라기 초기(?)의 송림역암과는 다른 퇴적 양상과 지질학적 의미를 가진다. 상서리통과 곡산통의 퇴적기원에 대하여 북한의 연구자들은 당시 한반도 북부와 남중국 지역이 "미루해"와 "곡산-송림해"라는 좁고 긴 바다로 이어져 있었다고 추정하였다. 반면, 남한의 연구자들은 이 지층들이 고생대 말-중생대 초 한중대지와 남중국대지의 충돌, 접합시 충상단층에 의하여 한중지괴 위에 얹힌 추복체의 잔류물일 가능성을 배제하지 않고 있다. 한반도 남북 지역 간 고생대 층서의 정밀대비와 세분, 거시적으로는 고생대 당시 동아시아 지역의 고지리와 지각진화, 특히 한중대지와 남중국대지의 봉합과정을 보다 깊이 이해하기 위해서는 남북의 관련분야 연구자들이 함께 참여하는 후속 연구가 필요하다.

Keywords

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