| Project/Area Number |
10440151
|
|---|
| 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 | Yokohama National University |
|---|
Principal Investigator |
ARIMA Mokoto YOKOHAMA NATIONAL UNIVERSITY, FACULTY OF EDUCATION AND HUMAN SCIENCES, PROFESSOR, 教育人間科学部, 教授 (10184293)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
ISHIKAWA Masahiro YOKOHAMA NATIONAL UNIVERSITY, FACULTY OF EDUCATION AND HUMAN SCIENCES, ASSOCIATE PROFESSOR, 教育人間科学部, 助教授 (70232270)
|
|---|
| Project Period (FY) |
1998 – 1999
|
| Project Status |
Completed (Fiscal Year 1999)
|
| Budget Amount *help |
¥9,600,000 (Direct Cost: ¥9,600,000)
Fiscal Year 1999: ¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 1998: ¥6,000,000 (Direct Cost: ¥6,000,000)
|
|---|
| Keywords | ELASTIC VELOCITY / LOWER CRUST / HIGH PRESSURE / EXPERIMENT / TONALITE / TANZAWA / IZU-BONIN-MARIANA (IBM) ARC / 大陸下部地殻 / 地震波速度測定 / 高温高圧実験 |
|---|
| Research Abstract |
A piston-cylinder apparatus with 34 mm internal diameter was developed for high pressure measurement of P- and S wave velocities of lower to middle crustal rocks. This newly developed apparatus makes possible to measure relatively large size core sample, 12 mm in length and14 mm in diameter up to 1.0 Gpa in a temperature range of 25-400℃.
Measured P-wave velocities for tonalitic-gabbroic rocks above 0.4 GPa are nearly constant. Measured velocities are 6.6-5.9 km/sec at 1.0 GPa and room temperature for tonalite-quartz gabbros with 53.8-71.1 wt. % SiO2 and those measured for hornblende gabbros with 43.2-47.7 wt. % Si02 are 7.1-6.9 km/sec. Comparison of the present results with the seismic profile of the northern IBM arc (Suyehiro et al., 1996) suggests a presence of tonalitic mid-crust (6.1-6.8 km/sec) ranging from 7 km to 12 km (about 30 % of the arc crust) overlying a mafic lower crust ( 7.1 - 7.3 km/sec P-wave velocities).
|
