U-Pb dating of ultramafic rocks

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K13910
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Geochemistry/Cosmochemistry
• Research Institution: The University of Tokyo
• Principal Investigator: Iizuka Tsuyoshi 東京大学, 大学院理学系研究科(理学部), 准教授 (70614569)
• Co-Investigator(Kenkyū-buntansha): 三河内 岳 東京大学, 大学院理学系研究科(理学部), 准教授 (30272462) ; 小澤 一仁 東京大学, 大学院理学系研究科(理学部), 教授 (90160853)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: ウランー鉛年代 / 超塩基性岩 / 輝石 / 隕石

Outline of Final Research Achievements

Precise and accurate chronological information on rock samples is essential to decode the early evolution of our solar system. In this study, we have developed acid washing method for high-precision U-Pb dating of pyroxenes. The developed acid washing method can remove non-radiogenic Pb from pyroxenes, resulting in the improvements of precision and accuracy of U-Pb dating. This method has been applied to terrestrial and meteoritic samples with mafic to ultramafic compositions. The results reveal the versatility of the dating technique.

Free Research Field

宇宙地球化学