Chemical analysis of trace elements in biogenic carbonates:development of a novel proxy for nutrient reconstruction

2015 Fiscal Year Final Research Report

• Project/Area Number: 25281015
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Environmental dynamic analysis
• Research Institution: Japan Synchrotron Radiation Research Institute
• Principal Investigator: Tamenori Yusuke 公益財団法人高輝度光科学研究センター, 利用研究促進部門, 副主席研究員 (10360819)
• Co-Investigator(Kenkyū-buntansha): Yoshimura Toshihiro 国立大学法人東京大学, 大気海洋研究所, 助教 (90710070)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 古環境 / 生物炭酸塩 / 化学形態 / 軟X線 / マイクロビーム / 軟X線吸収分光

Outline of Final Research Achievements

X-ray photoabsorption spectroscopy (XAS) is a nondestructive analytical technique for characterizing and identifying trace elements in compositionally complex natural materials. Furthermore, the combination of XAS and X-ray fluorescence analysis (XRF) using a micro-focused X-ray beam allow determination of both the chemical state of environmentally important trace elements and their spatial distribution in biogenic carbonates. A series of XRF/XAS mapping analyses clarified that the spatial distributions of sulfur compounds in Margaritifera Laevis depends on their chemical forms. The present research demonstrates that speciation analysis contributes to a more precise understanding of trace elements in biogenic carbonates for paleoclimatology.

Free Research Field

軟X線科学