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地幔矿物的波速测量研究是认识地球深部物质组成和性质的重要方法.国际上在大压机中利用超声波技术对地幔矿物材料开展了广泛的波速测量研究,实验温压范围达到地幔转换带条件,而国内大压机超声波波速测量局限于6GPa压力以内.在中国地质大学(武汉)地球深部研究实验室1 000tWalker型多面砧大压机上,利用超声波技术,建立了一套高压波速测量系统,对地幔转换带矿物Mg_2SiO_4瓦兹利石多晶样品在18GPa压力范围内的弹性波速进行了测量,测量结果与前人超声波波速测量结果相比总体吻合程度良好.利用多面砧大压机和超声波技术,在国内首次实现了地幔转换带高压条件下的波速测量,缩短了我国高压波速测量水平与国外先进水平的差距,同时可以为中国及周边地区地球物理观测资料的解析提供矿物物理方面的实验约束,为国内岩石矿物和固体材料的弹性研究提供实验技术支持.
The study of wave velocity measurement of mantle minerals is an important method to recognize the composition and properties of the earth’s deep matter.In the international press, ultrasonic wave technology is widely used to study the velocity of mantle minerals, and the experimental temperature-pressure range reaches the condition of mantle transition zone, However, the ultrasonic wave velocity measurement of large press in China is confined to 6GPa pressure.A set of high-pressure wave velocity measurement system is established on the 1000tWalker multi-facet anvil press of Deep Earth Research Laboratory of China University of Geosciences (Wuhan) The mantle transition zone mineral Mg2SiO4 bezierite polycrystalline sample was measured in the pressure range of 18GPa elastic wave velocity measurement results compared with the previous ultrasonic wave velocity measurement overall consistency is good.Using the multi-anvil large press and ultrasonic technology, In China, the wave velocity measurement under the condition of high pressure in the mantle transition zone was first realized, which shortens the gap between the high pressure wave velocity measurement in China and the advanced level in foreign countries. At the same time, it can provide the experimental constraints in mineral physics for the resolution of geophysical observation data in China and its surrounding areas, Provided for the study of elasticity of rock minerals and solid materials in China Test technical support.