1999 Fiscal Year Final Research Report Summary
Elastic velocity measurement of lower crustal rocks at high P-T conditions
| Project/Area Number |
10440151
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Petrology/Mineralogy/Science of ore deposit
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| Research Institution | Yokohama National University |
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Principal Investigator |
ARIMA Mokoto YOKOHAMA NATIONAL UNIVERSITY, FACULTY OF EDUCATION AND HUMAN SCIENCES, PROFESSOR, 教育人間科学部, 教授 (10184293)
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| 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)
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| Project Period (FY) |
1998 – 1999
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| Keywords | ELASTIC VELOCITY / LOWER CRUST / HIGH PRESSURE / EXPERIMENT / TONALITE / TANZAWA / IZU-BONIN-MARIANA (IBM) ARC |
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| 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).
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[Publications] Kaneko, Y., Maruyama, S., Terabayashi, M., Yamamoto, H., Ishikawa, M., Anma, R., Parkinson, C. D., Ota, T., Nakajima, Y., Katayama, U., Yamamoto, J., Yamauchi, K.: "Geology of the Kokchetav UHP-HP metamorphic belt, northern Kazakhstan"Island Arc. (in press). (2000)
Description
「研究成果報告書概要(欧文)」より
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