Development of the standard curve for the temporal size change of planktonic foraminifera

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K05311
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Geology
• Research Institution: Shimane University
• Principal Investigator: Hayashi Hiroki 島根大学, 総合理工学研究科, 准教授 (80399360)
• Co-Investigator(Kenkyū-buntansha): 佐々木 理 東北大学, 学術資源研究公開センター, 准教授 (60222006)
• Research Collaborator: SUZUKI Takuma
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 生層序学 / 浮遊性有孔虫 / 新第三紀 / 深海掘削計画

Outline of Final Research Achievements

We reconstruct the temporal size change pattern of the middle Miocene index species Paragloborotalia siakensis from 16 to 11 Ma at two drilling sites, namely, IODP Sites U1337 and U1338, in the eastern equatorial Pacific. The size change pattern was discussed with respect to previous geochemical and paleontological data. And tree-dimensional images of several specimens collected from characteristic horizons were acquired by the XMCT method. As a result of this study, rapid size changes of this species roughly correspond to isotopic events related to the EAIE. But we cannot determine the significant criterion between the size changes nearby the EAIE and background size changes. The Lilliput Effect model cannot explain for such background size changes. Consequently, the size changes of this species should be regarded as an environmental response following the EAIE.

Free Research Field

生層序学