| Project/Area Number |
12440147
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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 Makoto YOKOHAMA NATIONAL UNIVERSITY, FACULTY OF ENVIRONMENT AND INFORMATION SCIENCES, PROFESSOR, 大学院・環境情報研究院, 教授 (10184293)
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| Co-Investigator(Kenkyū-buntansha) |
ISHIKAWA Masahiro YOKOHAMA NATIONAL UNIVERSITY, FACULTY OF ENVIRONMENT AND INFORMATION SCIENCES, ASSOCIATE PROFESSOR, 大学院・環境情報研究院, 助教授 (70232270)
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| Project Period (FY) |
2000 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥10,800,000 (Direct Cost: ¥10,800,000)
Fiscal Year 2002: ¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2001: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 2000: ¥6,300,000 (Direct Cost: ¥6,300,000)
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| Keywords | seismic velocity / ultrasonic / island arc / continent / crust / tonalite / gabbro / granulite / 島孤地殻断面 / ピストンシリンダー装置 / 地震波速度異方性 / 伊豆弧 / コヒスタン島弧 / 幌満カンラン岩体 / 弾性波速度 / 高圧高温 / 大陸地殻 / 島弧地殻 / 伊豆小笠原弧 / 東北本州弧 / 岩石学的地殻断面モデル |
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| Research Abstract |
In order to better constrain the interpretation of the seismic structures, experimental measurements at high pressure (up to 1000 Mpa) and temperature (up to 1000□) of the compressional wave velocity (Vp) and shear wave velocity (Vs) on rock samples representative of deep crustal lithologies from the Mount Tanzawa (central Japan), Ichinomegata (NE Japan), Kohistan paleo-crustal section (northern Pakistan), Lutzow-Holm Bay and Enderby Land (East Antarctica) have been performed.
The main results are :
(1) Vp of the garnet clinopyroxenite decreases linearly from room temperature to 800 ℃, and decreases rapidly at temperatures higher than 800 ℃. Vp of the dunite decreases linearly from room temperature to 1000 ℃. Vp of the garnet clinopyroxenite is 7.74 km/s at room temperature, 7.70 km/s at 400 ℃, 7.66 km/s at 700 ℃, and 7.45 km/s at 1000 ℃. Vp of the dunite is 8.49 km/s at room temperature, 8.30 km/s at 400 ℃, 8.12 km/s at 700 ℃, and 7.90 km/s at 1000 ℃. Temperature derivative of Vp is-1.24 10-4 km/s℃ for the garnet clinopyroxenite and -6.06 10-4 km/s℃ for the dunite.
(2) At constant pressure of 1.0 Gpa, the Vp of hornblende gabbro gradually decreased from 7.21 km/s at 25 ℃ to 6.91 km/s at 700 ℃. Similarly the Vp values of the pyroxene-hornblende gabbros reduces from 7.06 km/s at 25 ℃ to 6.73 km/s 800 ℃. Also the Vp value of the hornblendite lowers from 7.11 km/s (25 ℃) to 6.45 km/s (800 ℃).
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