Journal of the Paleontological Society of Korea (고생물학회지)

The Paleontological Society of Korea (한국고생물학회)
권호 표지

Benthic Foraminiferal Biostratigraphy and Paleoenvironments of the Seogwipo Formation, Jeju Island, Korea

제주도 서귀포층의 저서성 유공충 생층서 및 고환경

Kang, So-Ra
강소라

  • Published : 20030000
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Abstract

A study on the benthic foraminiferal fauna from the Seogwipo Formation outcrop and seven drilled cores in Jeju Island, Korea, has been carried out in order to enlighten their biostratigraphy and paleoenvironments. Based on the characteristics of benthic foraminiferal fauna, six benthic foraminiferal assemblage zones in the Seogwipo Formation outcrop and eleven benthic foraminiferal assemblage zones in drilled cores were established. The lower and middle parts of the outcrop consist of mixed fauna of cold and warm water neritic species, whereas the upper part consists of warm fauna in which warm water neritic species are dominant. The benthic foraminiferal faunas in drilled cores also are composed of mixed and warm faunas in the lower and upper parts, respectively. Three ecostratigraphic zones can be divided in the outcrop and drilled cores on the basis of benthic foraminiferal assemblages: Cold-temperate Current Zone, Warm-temperate Current Zone and Warm Current Zone. These ecostratigraphic zones reflect paleoceanographic conditions and their variational modes around Jeju Island at that time. The ecostratigraphy indicates that the sediments from seven drilled cores are well correlated with those from the Seogwipo Fonnation outcrop. The Seogwipo Formation dates from late Late Pliocene to Early Pleistocene in age, being correlated with the Omma Formation of the upper Kakegawa Group and Soga Group in Japan. The benthic foraminiferal faunas in the lower and middle parts of the Seogwipo Formation yielding cold water species are correlated with the Omma-Manganji Fauna, whereas that in the upper part of the formation yielding warm water species is correlated with Younger Omma Fauna of Japan. It is suggested that the cold event identified from the Seogwipo Formation was caused by the migration of oceanographic front in the sea of northeast Asia during the late Pliocene to early Pleistocene.

제주도의 서귀포층 노두와 시추코아 내의 퇴적물로부터 산출되는 저서성 유공충 화석군집을 분석하여 생층서를 수립하고 고환경을 복원하였다. 저서성 유공충 화석군집 특성에 의해 서귀포층 노두에서 6개와 시추코아에서 11개의 저서성 유공충 군집대 (Assemblage Zone)가 설정되었다. 서귀포층 노두의 하부와 중부는 천해성 한류 및 난류종이 혼재하는 혼합성 군집대들로 구성되며, 층의 상부는 난류성 천해종이 우세한 난류성 군집대로 구성된다. 시추코아에서 산출되는 저서성 유공충 화석군집 역시 천해성 종들로 구성된 하부의 한류 및 난류의 혼합성 군집대들과 상부의 난류성 군집대들로 구성된다. 서귀포층 노두와 시추코아 내의 퇴적층은 생태층서학적으로 세 개의 대(zone)로 구분된다. Cold-temperate Current Zone, Warm-temperate Current Zone, Warm Current Zone. 이들 생태층서대(Ecostratigraphic Zone)는 그 당시 제주도 부근의 고해양학적 환경과 이의 변화양상을 반영하고 있다. 생태층서학적으로 볼 때, 유공충 화석을 함유하는 시추코아내 퇴적물은 서귀포충 노두와 대비된다. 서귀포층의 퇴적시기는 late Late Pliocene에서 Early Pleistocene에 해당하며, 서귀포층은 일본의 Omma 층, Kakegawa 층군 상부 및 Soga 층군에 대비된다. 서귀포층 하부 및 중부의 한류성 종을 포함하는 저서성 유공충 화석군집은 일본의 Omma-Manganji Fauna에 대비되며, 서귀포충 상부의 난류성 종으로 구성되는 저서성 유공충 화석군집은 일본의 Younger Omma Fauna에 대비된다. 서귀포층에서 인지되는 제주도 해역의 한랭화사건(cold event)은 플라이오세 후기 말-플라이스토세 초기에 북동 아시아 해역에서의 전선(oceanographic front)의 이동에 의하여 일어난 것이다.

Keywords

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