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2020 Vol.25, Issue 1

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Discussion on the Late Miocene Biogenic Opal Crash in the Andaman Sea

마이오세 후기 안다만해에서 생물기원 오팔 함량의 폭감에 대한 논의

JONGMIN LEE1
,
SUNGHAN KIM2
,
BOO-KEUN KHIM3
이 종민1
,
김 성한2
,
김 부근3
1Graduate Student, Department of Oceanography, Pusan National University
2Senior Researcher, Division of Polar Paleoenvironment, Korea Polar Research Institute
3Professor, Department of Oceanography, Pusan National University
1부산대학교 해양학과 박사과정
2극지연구소 극지고환경 연구부 선임연구원
3부산대학교 해양학과 교수
* Corresponding Author
29 February 2020. pp. 1-8
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Abstract

마이오세 후기(약 6.7 Ma)에 나타난 생물기원 오팔 함량의 폭감(biogenic opal crash)이 안다만해에서 획득된 IODP Site U1447과 NGHP Site 17의 코아 퇴적층에서 확인되었다. 두 코아 사이의 오팔 함량과 전반적인 변화 경향에서 나타난 차이점은 실험분석에 사용된 시약의 농도와 층서 설정에 의해 계산된 퇴적률의 차이 때문이다. 안다만해에서 발생한 마이오세 후기 생물기원 오팔 함량의 폭감은 인도네시아 관통류(Indonesian Throughflow)의 차단으로 인한 서태평양으로부터의 영양염 공급 감소와 더불어 인도여름몬순의 약화에 의한 강수량 감소로 강물에 의한 영양염 공급 감소의 복합적인 요인에 의한 것으로 제안된다.

Biogenic opal crash at about 6.7 Ma was identified at both IODP Site U1447 and NGHP Site 17 in the Andaman Sea. The different biogenic opal content and general variation pattern between two sites may be attributed to the different concentration of analytical reagent and sedimentation rate estimated by the different chronological approaches. Nevertheless, this study suggests that the biogenic opal crash in the Andaman Sea is closely related to the restriction of Indonesian Throughflow and to the decreasing strength of Indian summer monsoon during the late Miocene, both of which resulted in the reduction of nutrient supply.

Keywords
Nutrient
Productivity
Indonesian Throughflow
IODP
Indian Ocean

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Information
  • Publisher :The Korean Society of Oceanography
  • Publisher(Ko) :한국해양학회
  • Journal Title :The Sea Journal of the Korean Society of Oceanography
  • Journal Title(Ko) :한국해양학회지 바다
  • Volume : 25
  • No :1
  • Pages :1-8
  • Received Date : 2020-03-01
  • Revised Date : 2020-03-05
  • Accepted Date : 2020-03-06
  • DOI :https://doi.org/10.7850/jkso.2020.25.1.001
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