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마이오세 후기 안다만해에서 생물기원 오팔 함량의 폭감에 대한 논의

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

  • 이종민 (부산대학교 해양학과) ;
  • 김성한 (극지연구소 극지고환경 연구부) ;
  • 김부근 (부산대학교 해양학과)
  • LEE, JONGMIN (Department of Oceanography, Pusan National University) ;
  • KIM, SUNGHAN (Division of Polar Paleoenvironment, Korea Polar Research Institute) ;
  • KHIM, BOO-KEUN (Department of Oceanography, Pusan National University)
  • 투고 : 2020.03.01
  • 심사 : 2020.03.06
  • 발행 : 2020.02.28

초록

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.

키워드

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