Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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Distribution Patterns and Provenance of Surficial Sediments from Ieodo and Adjacent Sea

이어도와 주변 해역의 표층퇴적물 분포와 퇴적물 기원지

  • Chang, Tae Soo (Faculty of Earth and Environmental Sciences, Chonnam National University) ;
  • Jeong, Jong Ok (Center for Research Facilities, Gyeongsang National University) ;
  • Lee, Eunil (Ocean Research Division, Korea Hydrographic and Oceanographic Agency) ;
  • Byun, Do-Seong (Ocean Research Division, Korea Hydrographic and Oceanographic Agency) ;
  • Lee, HwaYoung (Ocean Research Division, Korea Hydrographic and Oceanographic Agency) ;
  • Son, Chang Soo (Faculty of Earth and Environmental Sciences, Chonnam National University)
  • 장태수 (전남대학교 지구환경과학부) ;
  • 정종옥 (경상대학교 공동실험실습관) ;
  • 이은일 (국립해양조사원 해양과학조사연구실) ;
  • 변도성 (국립해양조사원 해양과학조사연구실) ;
  • 이화영 (국립해양조사원 해양과학조사연구실) ;
  • 손창수 (전남대학교 지구환경과학부)
  • Received : 2020.12.16
  • Accepted : 2020.12.29
  • Published : 2020.12.31
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Abstract

The seafloor geology of Ieodo, a submerged volcanic island, has been poorly understood, although this place has gained considerable attention for ocean and climate studies. The main purpose of the study is to understand and elucidate types, distribution patterns and provenance of the surficial sediments in and around the Ieodo area. For this purpose, 25 seafloor sediments were collected using a box-corer, these having been analyzed for grain sizes. XRD (X-ray Diffraction) analysis of fine-grained sediments was conducted for characterizing clay minerals. The peak of Ieodo exists in the northern region, while in the southern area, shore platforms occur. The extensive platform in the south results from severe erosion by strong waves. However, the northern peak still survived from differential weathering. Grain size analyses indicated that gravels and gravelly sands with skeletons and shells were distributed predominantly on the volcanic apron and shore platform. Muddy sediments were found along the Ieodo and the adjacent deeper seafloor. Based on the analysis of clay mineral composition, illites were the most abundant in fine muds, followed by chlorites and kaolinites. The ratio plots of clay minerals for the provenance discrimination suggested that the Ieodo muds were likely to be derived from the Yangtze River (Changjiang River). As a consequence, gravels and gravelly sands with bioclastics may be supplied from the Ieodo volcanic apron by erosion processes. Wave activities might play a major role in transportation and sedimentation. In contrast, fine muds were assumed to be derived from the inflow of the Yangtze River, particularly in summer. Deposition in the Ieodo area is, therefore, probably controlled by the inflow from the Changjiang Dilute Water and summer typhoons from the south.

해양환경과 기상연구 거점으로서의 중요성에도 불구하고, 수중에 잠긴 화산섬, 이어도의 퇴적물과 해양지질학적 연구는 부족하다. 이 연구의 목적은 이어도 해저에 분포하는 퇴적물의 종류와 분포양상, 그리고 그 퇴적물의 기원지를 밝히는 것이다. 이를 위해 이어도와 그 주변에서 박스코어러를 사용하여 25점의 표층퇴적물을 획득하였으며, 퇴적물 입도분석과 XRD 점토광물 분석을 수행하였다. 이어도의 정봉은 북부에 존재하며, 남부는 파식대지가 나타난다. 따라서 화산체의 남부는 파랑에 의한 침식작용으로 사라지고, 북부에 일부만 살아남은 것으로 해석된다. 입도분석결과, 패각과 산호편을 포함하는 자갈과 모래 퇴적물은 이어도 화산체와 파식대지에 주로 분포하며, 니질 퇴적물은 이어도 주변해역의 깊은 곳에 나타난다. 점토광물은 일라이트가 대부분을 차지하며, 녹니석과 카올리나이트 순으로 풍부하다. 삼각도표에 도시한 결과, 세립질 퇴적물은 모두 양쯔강(장강) 기원 영역에 도시되었다. 결과적으로 조립질의 자갈과 모래 퇴적물은 이어도 화산체의 풍화침식의 산물과 서식 생물의 골격, 껍질로서 운반과 퇴적과정에서 파랑이 주요한 역할을 한 것으로 해석되며, 반면에 세립질 퇴적물은 여름철 장강으로부터 이어도 해역으로 유입된 것으로 보인다. 이와 같이, 이어도의 퇴적작용은 여름철 장강 유입수와 태풍의 영향이 큰 것으로 해석된다.

Keywords

Acknowledgement

이 연구는 국립해양조사원의 "이어도 해양과학기지 주변해역의 해저지질 특성 연구"의 지원을 받아 수행되었습니다. 이어도 탐사와 시료채취에 도움을 준 '나라호' 선장님과 승조원들께 특별히 감사드립니다. 또한 현장조사와 입도분석을 기꺼이 도와준 연안지질/퇴적학 실험실 학생들에게 고마움을 전하며, 특히 논문에 사용된 그림 작업을 도와주고 데이터 표를 정리해준 임세린 학생에게 특별히 감사드립니다. 마지막으로 논문 심사과정에서 유익한 조언을 해주신 익명의 심사위원들께 깊은 감사를 드립니다.

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