| Project/Area Number |
23740379
|
|---|
| Research Category |
Grant-in-Aid for Young Scientists (B)
|
| Allocation Type | Multi-year Fund |
|---|
| Research Field |
Geology
|
|---|
| Research Institution | Waseda University |
|---|
Principal Investigator |
MACHIDA Shiki 早稲田大学, 理工学術院, 助教 (40444062)
|
|---|
| Project Period (FY) |
2011 – 2013
|
| Project Status |
Completed (Fiscal Year 2013)
|
| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2012: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2011: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
|
|---|
| Keywords | プチスポット / マグマ生成条件 / マグマプロセス / アセノスフェア / 炭酸塩質メルト / 複数相飽和実験 / 炭酸塩質かんらん岩 / 輝岩 / 初生マグマ / 複数総飽和実験 |
|---|
| Research Abstract |
To define petit-spot geology, a comprehensive data set about geochemistry (major and trace elements, and Sr and Nd isotopic compositions) and Ar-Ar age of alkaline basaltic rocks and glasses from three petit-spot volcanic fields in the northwestern Pacific were analyzed. Then, melting experiments for three geochemical types of basalt groups were conducted, to define finally equilibrated solid phases, temperature, and pressure for petit-spot primary magma. The spatiotemporally change of eruption place for each magma group indicates that magma is originated from isolated melt ponds at the lithosphere-asthenosphere boundary (LAB). And, results of melting experiments show that magma from LAB were tapped in lower lithosphere in response to plate flexure, and were finally equilibrated with ambient lithosphere, followed by eruption.
|
