Causes of the last global deep-sea extinction from the analyses of foraminiferal tests

• Project/Area Number: 19740317
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Stratigraphy/Paleontology
• Research Institution: Yokohama National University
• Principal Investigator: KAWAGATA Shungo Yokohama National University, 教育人間科学部, 准教授 (90244219)
• Project Period (FY): 2007 – 2009
• Project Status: Completed (Fiscal Year 2009)
• Budget Amount: ¥3,620,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥420,000); Fiscal Year 2009: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2008: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2007: ¥1,800,000 (Direct Cost: ¥1,800,000)
• Keywords: 深海生有孔虫 / 古生態 / 絶滅 / 古海洋 / 環境変動

Research Abstract

I analysed the causes of the last global deep-sea extinction of the particular benthic foraminifera during the mid-Pleistocene Transition. On the basis of their internal test morphology, they were found to have weak phylogenic relationship among other benthic foraminifera that shows similar structure inside the test. Optically granular structure were found in the test of extinct foraminifera and suggested their deep infaunal microhabitat. The last global deep-sea extinction was implied that it might have occurred in associated with cooling deep-water and becoming more oxidised environments at deep-sea during the middle Pleistocene.