Abstract

Oral Sessions

Day 3, May 13（Wed.）　10:05-10:25　Room C (1101/02)

3C-O12-1005　　PDF

Marine carbon cycle studies by using boron isotope proxy of planktonic foraminifera

(¹Kobe Univ., ²JAMSTEC, ³Univ. Tokyo, ⁴Kanazawa Univ., ⁵Kochi Univ.)
^oKaoru Kubota^1,2, Yusuke Yokoyama^2,3, Tsuyoshi Ishikawa², Takuya Sagawa⁴, Minoru Ikehara⁵, Toshitsugu Yamazaki³

Boron isotope proxy of biogenic calcium carbonate is widely used in paleoclimatology to reconstruct seawater pH and carbon dioxide concentration in the atmosphere. But boron isotope measurement of foraminifera shell has been one of the most difficult analysis in geochemistry, due to small amount of boron in calcite shell of foraminifera, strict requirement in precision in use of paleoclimatology, and its susceptibleness to contamination sourced from laboratory environment. In the presentation I will show results of boron isotope analysis of the shells of two species of surface-dwelling foraminifera from the same marine sediment core collected from the western equatorial Pacific, which is to investigate marine carbon cycle in glacial-interglacial timescales.