Water content of the mantle transition zone constrained by volcanic rocks

2015 Fiscal Year Final Research Report

• Project/Area Number: 25287144
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Petrology/Mineralogy/Economic geology
• Research Institution: Hokkaido University (2014-2015); Osaka City University (2013)
• Principal Investigator: Kuritani Takeshi 北海道大学, 理学(系)研究科(研究院), 准教授 (80397900)
• Co-Investigator(Kenkyū-buntansha): YOKOYAMA TETSUYA 東京工業大学, 大学院理工学研究科, 准教授 (00467028)
• Co-Investigator(Renkei-kenkyūsha): NAKAMURA MICHIHIKO 東北大学, 大学院理学研究科, 教授 (70260528)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 水循環 / 火山 / マントル / マグマ

Outline of Final Research Achievements

Geophysical observation has suggested that the mantle transition zone beneath NE China is hydrous, and intraplate magmatism of this region has been caused by a transition zone-derived mantle plume. In this study, petrological and geochemical analyses were carried out on basaltic rocks in NE China to estimate the water content of the mantle transition zone. It is suggested that the water content of the source mantle is up to 350 ppm, which is significantly higher than that of the normal upper mantle (~120 ppm). As a preliminary result, the water content of the mantle transition zone of ~0.7 wt.% is obtained.

Free Research Field

火山岩岩石学