Foraminiferal assemblage and isotope studies of diatomaceous deposits collected under the subarctic convergence in the North Atlantic

• Project/Area Number: 21740361
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Geology
• Research Institution: Akita University
• Principal Investigator: YAMASAKI Makoto Akita University, 工学資源学研究科, 准教授 (40344650)
• Project Period (FY): 2009 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000); Fiscal Year 2010: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2009: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
• Keywords: 地球史 / 浮遊性有孔虫 / 海洋前線 / 北大西洋 / 酸素同位体 / 古海洋 / 第四紀 / 珪藻

Research Abstract

Stratigraphic variation in foraminiferal assemblage and oxygen isotope was examined using the late Pleistocene diatomaceous deposits collected under the subarctic convergence in the North Atlantic. Oxygen isotope from surface and subsurface dwelling planktic foraminifers (Globigerina quinqueloba and Neogloboquadrina pachyderma sinistral) revealed that mat-forming diatom, Thalassiothrix longissima, occurred extremely abundant under cooler surface water condition, while it occurred commonly under warmer surface water one. The evidence suggests that deposition of the diatom mats is closely related to the surface water conditions.

Research Products

• [Presentation] 北大西洋亜極前線下に発達する珪藻軟泥由来の浮遊性有孔虫を用いた古環境復元 (2011)
  • Author(s): 山崎誠・大崎亜希子・嶋田智恵子・佐藤時幸・池原実
  • Organizer: 高知大学海洋コア総合研究センター全国共同利用研究成果発表会(予察)
  • Place of Presentation: 高知大学海洋コア総合研究センター(高知)
  • Year and Date: 2011-03-01
• [Presentation] 北大西洋亜極前線下に発達する珪藻軟泥由来の浮遊性有孔虫を用いた古環境研究 (2011)
  • Author(s): 山崎誠・大崎亜希子・島田智恵子・佐藤時幸・池原実
  • Organizer: 高知大学海洋コア総合研究センター 全国共同利用研究成果発表会
  • Place of Presentation: 高知大学海洋コア総合研究センター(南国市)
  • Year and Date: 2011-03-01
• [Presentation] Timing of shell size increase of the foraminifer N. pachyderma (s) in the Pleistocene, 10DP Site U1304, the North Atlantic Ocean. (2009)
  • Author(s): 山崎誠・千代延俊・佐藤時幸
  • Organizer: 日本地球惑星科学連合2009年大会
  • Place of Presentation: 幕張メッセ国際会議場(千葉)
  • Year and Date: 2009-05-19
• [Presentation] Timing of shell size increase of the foraminifer N.pachyderma(s)in the Pleistocene, IODP Site U1304, the North Atlantic Ocean (2009)
  • Author(s): 山崎誠, 佐藤時幸, 千代延俊
  • Organizer: 日本地球惑星科学連合2009年大会
  • Place of Presentation: 幕張メッセ(千葉県)