Peleo-climatic observatories based on stalagmite geochemical proxies and newly developed isotopic analyses

2016 Fiscal Year Final Research Report

• Project/Area Number: 25287131
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Geology
• Research Institution: The University of Tokyo (2016); Kyushu University (2013-2015)
• Principal Investigator: Kano Akihiro 東京大学, 理学(系)研究科(研究院), 教授 (60231263)
• Co-Investigator(Kenkyū-buntansha): 坂井 三郎 国立研究開発法人海洋研究開発機構, その他部局等, 研究員 (90359175) ; 柏木 健司 富山大学, その他の研究科, 准教授 (90422625)
• Research Collaborator: SHEN Chuan-Chou ; FUJITA Yuki ; UEMURA Ryu ; Hori Masako ; HAYANO Tomoko
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 石筍 / 古気候 / 安定同位体 / 微量元素

Outline of Final Research Achievements

Stalagmite is a suitable archive of the terrestrial paleo-climate in densely-populated temperate-subtropical areas. We have analyzed paleo-climatic proxies of the Japanese stalagmites collected from four sites with different climatic settings (Jinseki-kogen in Hiroshima Prefecture, Itoigawa in Niigata Prefecture, Gujo in Gifu Prefecture, and Taiki in Mie Prefecture). Our high-resolution records from these stalagmites reveals new aspects on the Japanese paleo-climetes; 1) stalagmite Sr isotopic ratio reflected from change in weathering processes in water reserve area, 2) oxygen isotope of the Itoigawa stalagmite recorded variation in winter monsoon intensity during Holocene, 3) the stalagmites from Gujo and Taiki sites recorded the millennial-scale Heinrich events, and 4) variation in the oxygen isotope of the Taiki stalagmite includes a fraction of the paleo-temperature change.

Free Research Field

地質学