10Be for Quaternary volcanic rocks from southwest Japan arc: role of subducted sediments

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K05336
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Petrology/Mineralogy/Economic geology
• Research Institution: Iwate University
• Principal Investigator: Tsuchiya Nobutaka 岩手大学, 教育学部, 教授 (50192646)
• Co-Investigator(Kenkyū-buntansha): 國分 陽子 国立研究開発法人日本原子力研究開発機構, バックエンド研究開発部門 東濃地科学センター, 研究副主幹 (10354870) ; 梅田 浩司 弘前大学, 理工学研究科, 教授 (60421616)
• Research Collaborator: SASAKI Jun
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: ベリリウム-10 / 西南日本 / 第四紀火山岩 / アダカイト

Outline of Final Research Achievements

We investigate Be isotopic ratios for Daisen, Sambe, Aonoyama volcanic rocks in the southwest Japan arc, and Iwate and Kanpu volcanic rocks in the northeast Japan. Be isotopic ratios (10Be/9Be) for the volcanic rocks from Daisen, Sambe, and Aonoyama were 0.3--17 x 10^-13, indicate the incorporation of a component derived from subducted sediments in the southwest Japan arc magmas. However, our result of Iwate volcano was extremely lower than those from previous results, further investigation will be necessary for precise determination of Be isotopic ratios.

Free Research Field

地質学