2013 Fiscal Year Final Research Report
Rheological structure of the 660 km discontinuity in the Earth's mantle
| Project/Area Number |
22340161
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Petrology/Mineralogy/Science of ore deposit
|
|---|
| Research Institution | Ehime University |
|---|
Principal Investigator |
NISHIHARA Yu 愛媛大学, 地球深部ダイナミクス研究センター, 准教授 (10397036)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
OHUCHI Tomohiro 愛媛大学, 地球深部ダイナミクス研究センター, 助教 (60570504)
KAWAZOE Takaaki 愛媛大学, 地球深部ダイナミクス研究センター, グローバルCOE 助教 (40527610)
|
|---|
| Co-Investigator(Renkei-kenkyūsha) |
NISHIYAMA Norimasa 愛媛大学, 地球深部ダイナミクス研究センター, 准教授 (10452682)
|
|---|
| Project Period (FY) |
2010-04-01 – 2014-03-31
|
| Keywords | 鉱物物理 / マントル遷移層 / 下部マントル / レオロジー / 高圧変形実験 / 上部マントル |
|---|
| Research Abstract |
To understand a role of rheological properties (such as viscosity contrast at 660 km depth) in material behaviors in the Earth's deep mantle, the rheology of mantle minerals were studied based on high-pressure and high-temperature deformation experiments with in situ observation. We demonstrated the importance of grain-size-sensitive creeps, as well as dislocation creep, in deformation of the upper mantle olivine, the significant water-weakening of wadsleyite in the mantle transition zone, and that separation of oceanic crust near 660 km depth is unlikely due to low viscosity contrast between ringwoodite and majorite.
|
