2011 Fiscal Year Final Research Report

Behavior of lithium isotopes in subduction zone mantle

Research Project

Project/Area Number	21540505
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Single-year Grants
Section	一般
Research Field	Geochemistry/Astrochemistry
Research Institution	Okayama University
Principal Investigator	OTA Tsutomu 岡山大学, 地球物質科学研究センター, 助手 (80379817)
Research Collaborator	MORIGUCHI Takuya 岡山大学, 地球物質科学研究センター, 准教授 (70304342) KUNIHIRO Takuya 岡山大学, 地球物質科学研究センター, 准教授 (30432628) JAMES G. brophy インディアナ大学, 地球科学科, 教授
Project Period (FY)	2009 – 2011
Keywords	地球化学 / 元素分配 / 高温高圧実験 / 二次イオン質量分析計 / 沈み込み帯 / 地殻・マントル物質 / カンラン石 / リチウム
Research Abstract	This study aimed to decipher parameters of lithium partitioning and lithium isotope fractionation between mantle olivine and aqueous fluid, in terms of experimental petrology, in order to understand chemical interaction between surficial and mantle materials in deep subduction zone, which has defined a chemical evolution of the Earth. Lithium isotopic compositions obtained from synthesized olivines suggested that the subduction-zone mantle could have been more significantly fractionated in lithium isotope, rather than expected by previous studies.

(2 results)