2.0 GPa、室温至1 200 ℃条件下斜长角闪岩的纵波速度及其衰减

岳兰秀; 谢鸿森; 刘丛强; 吴丰昌

doi:10.11858/gywlxb.2002.03.003

2.0 GPa、室温至1 200 ℃条件下斜长角闪岩的纵波速度及其衰减

doi: 10.11858/gywlxb.2002.03.003

1.
中国科学院地球化学研究所，贵州贵阳 550002；
2.
中国科学院研究生院，北京 100039

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通讯作者:
岳兰秀

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出版历程
- 收稿日期: 2002-01-16
- 修回日期: 2002-03-30
- 发布日期: 2002-09-05

Compressional Velocity and Attenuation in Amphibolite at 2.0 GPa and up to 1 200 ℃

1.
Institute of Geochemistry, Chinese Academy of Science, Guiyang 550002, China;
2.
Graduate School of Chinese Academy of Sciences, Beijing 100039, China

More Information

Corresponding author: YUE Lan-Xiu

摘要

摘要: 利用YJ-3000 t 压力机，在2.0 GPa、室温至1 200 ℃条件下，测量了新疆库地地区斜长角闪岩的纵波速度（vp）和力学品质因子（Q值）。实验结果表明：斜长角闪岩的vp和Q值随温度的升高而降低，在升温的初始阶段，vp和Q值随温度下降的幅度较小，随着温度的升高其下降的幅度逐渐增大；由于斜长角闪岩的各向异性，导致了在3个方向上vp随温度而下降的幅度显著增大时的温度不同，其中x和y方向为812 ℃，z方向为673 ℃。而在各方向上的Q值随温度下降的幅度显著增大时的温度相差不大，约为812 ℃。观察回收的实验产物表明：当温度大于647 ℃时，产物中开始出现熔体，vp在x和y方向上的下降幅度没有明显的变化，而在z方向上的下降幅度增大；此时熔体对Q值的影响不大。当温度大于812 ℃时，产物中的熔体含量明显增多，vp和Q值下降的幅度都显著增大。据此认为，部分熔融是弹性波速度减小和衰减增大的主要原因。
- 斜长角闪岩 /
- 高温高压 /
- 部分熔融 /
- 纵波速度 /
- 衰减
Abstract: Compressional wave velocity and attenuation in amphibolite collected from Kudi, Xinjiang Province were measured at high pressure (2.0 GPa) and high temperature (up to 1 200 ℃). The experimental results show that vp and Q values decrease with the increase of temperature. At the beginning of increasing temperature, vp decreases slowly, and then decreases rapidly with the higher temperature. Because of amphiboliteps anisotropy, the temperature at which vp decreases quickly in different directions is different. The temperature is 812 ℃ in x and y and 673 ℃ in z. However, the temperature at which Q decreases quickly is about 812 ℃ at the three directions. It can be concluded from the experimental results of minerals that as the temperature is higher than 647 ℃, the melt appears. The scope of vp decreasing with temperature in x and y directions is not various than before. It increases in z direction. However, the melt does not affect Q values. As the temperature is higher than 812 ℃, the melt is more than before, vp and Q values decrease more quickly. Therefore, partial melting is the main reason for elastic wave velocity decreasing and attenuation increasing.
- amphibolite /
- high-temperature and high-pressure /
- partial melting /
- compressional velocity /
- attenuation

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参考文献(39)

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文章访问数: 10400
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2.0 GPa、室温至1 200 ℃条件下斜长角闪岩的纵波速度及其衰减

doi: 10.11858/gywlxb.2002.03.003

通讯作者: 岳兰秀

计量

出版历程

Compressional Velocity and Attenuation in Amphibolite at 2.0 GPa and up to 1 200 ℃

Corresponding author: YUE Lan-Xiu

计量

出版历程

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通讯作者:
岳兰秀