Elastic velocity measurement of lower crustal rocks at high P-T conditions

高 P-T 条件下地壳岩石的弹性速度测量

• 批准号: 10440151
• 负责人: ARIMA Mokoto
• 金额: $ 6.14万
• 依托单位: Yokohama National University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10440151/
• 关键词: 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

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).

研制了一种内径34 mm的活塞-圆柱装置，用于高压测量中下地壳岩石的P波和S波速度。该装置能在25-400℃温度范围内测量1.0GPa的长12 mm、直径14 mm的较大岩心样品，在0.4GPa以上测得的英云闪长岩-辉长岩的纵波速度几乎为常数。在1.0 GPa和室温下，对质量分数为53.8-71.1 wt. %的SiO2和角闪石辉长岩的43.2-47.7 wt. % SiO2的速度为7.1- 6.9km/sec。本结果与IBM弧北方地震剖面的比较（Suyehiro等人，1996年）表明存在英云闪长质中地壳（6.1-6.8 km/sec），范围为7 km至12 km（约占弧壳的30%），覆盖在镁铁质下地壳（7.1 - 7.3 km/sec P波速度）上。

项目成果

Nakajima, K. and Arima, M.: "Melting experiments on hydrous low-K tholeiite : Implications for the genesis of tonalitic crust in the Izu-Bonin-Mariana arc, (eds. R. J. Stern and M. Arima)"The Island Arc. 7. 359-373 (1998)

Nakajima, K. 和 Arima, M.：“含水低 K 拉斑玄武岩的熔化实验：对伊豆-小笠原-马里亚纳岛弧英闪长质地壳成因的启示，（R. J. Stern 和 M. Arima 编辑）”岛弧

Nakajima,K.,and Arima,M.: "Meltings experiments on hydrous low-K tholeiite : Inplica Toms for the genesis of tonalitic crustin the Izu-Bonin-Mariana arc." The Island Arc. 7. 359-373 (1998)

Nakajima, K. 和 Arima, M.：“水合低 K 拉斑玄武岩的熔化实验：伊豆-小博宁-马里亚纳岛弧英闪长质结皮成因的 Inplica Toms”。

Gupta A.K.,Arima M.: "Experimental studies on the system phlogopite-Mn phologopite"J. Mineral. petrol. Eco. Geol.. 93. 129-137 (1998)

Gupta A.K.，Arima M.：“金云母-锰金云母体系的实验研究”J。

有馬 真: "岩波講座 地球惑星科学13巻 地球近代論"岩波書店. 259-302 (1998)

有马诚：《岩波地球与行星科学讲座第 13 卷：地球现代理论》岩波书店 259-302 (1998)。

有馬 眞: "岩波講座 地球惑星科学13 地球進化論,火成作用の変遷と大陸の進化" 岩波書店, 259-302 (1998)

有马诚：“岩波讲座地球与行星科学13地球演化理论、火成岩过程的变化和大陆的演化”岩波书店，259-302（1998）