A new analysis method for elastic property of mantle minerals

2016 Fiscal Year Final Research Report

• Project/Area Number: 26610136
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Solid earth and planetary physics
• Research Institution: Hokkaido University
• Principal Investigator: Yamamoto Junji 北海道大学, 総合博物館, 准教授 (60378536)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 弾性特性 / 流体包有物 / 高温高圧実験 / マントル

Outline of Final Research Achievements

We developed a new analysis method for the elastic property of mantle minerals. During transport of a mantle xenolith by magma and subsequent cooling, fluid inclusions change their volume due to both elastic and plastic properties of the host mineral, which are sensitive to differential pressure between internal pressure of the fluid inclusion, and stress in surrounding crystal lattice. Micro-Raman spectroscopy enables precise non-destructive analyses of CO2 density in a very small volume. By applying this method to CO2 fluid inclusions in minerals, we can detect the slight change in volume of fluid inclusions, thereby deformation of the host minerals.
We installed a sapphire anvil cell, which is able to make PT environment of up to 800°C and 1 GPa. It made us to control outside temperature and pressure of a mineral involving fluid inclusions.

Free Research Field

地球化学