Geochronological study of high precision zircon microanalysis for crustal evolution

2016 Fiscal Year Final Research Report

• Project/Area Number: 25287132
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Geology
• Research Institution: National Institute of Polar Research
• Principal Investigator: Hokada Tomokazu 国立極地研究所, 研究教育系, 准教授 (60370095)
• Co-Investigator(Kenkyū-buntansha): 堀江 憲路 国立極地研究所, 研究教育系, 助教 (00571093) ; 清川 昌一 九州大学, 理学(系)研究科(研究院), 准教授 (50335999) ; 谷 健一郎 独立行政法人国立科学博物館, 地学研究部, 研究員 (70359206)
• Research Collaborator: TAKEHARA Mami 国立極地研究所, 研究教育系, 特任研究員
• Project Period (FY): 2013-04-01 – 2017-03-31
• Keywords: ジルコン / 二次イオン質量分析計 / SHRIMP / U-Pb年代測定 / 微量元素 / 酸素同位体

Outline of Final Research Achievements

We have improved and established the sample preparation protocol for the combined high precision U-Pb age determination, trace elements analyses and oxygen isotope analysis on zircon crystal using sensitive high resolution ion micro probe. Applying U-Pb dating, Ti and REE analyses on zircon from the natural granitic samples from the Ishizuchi Cauldron, we have estimated the duration of crystal fractionation from tonalitic to granitic magma in 400 million years time. We have also applied oxygen isotope analysis, and have detected the change of oxygen isotope during the crystal fractionation.

Free Research Field

地質学