高温高压下几种岩石熔融玻璃的弹性波速

蒋玺 周文戈 谢鸿森 刘永刚 范大伟

蒋玺, 周文戈, 谢鸿森, 刘永刚, 范大伟. 高温高压下几种岩石熔融玻璃的弹性波速[J]. 高压物理学报, 2013, 27(4): 481-489. doi: 10.11858/gywlxb.2013.04.002
引用本文: 蒋玺, 周文戈, 谢鸿森, 刘永刚, 范大伟. 高温高压下几种岩石熔融玻璃的弹性波速[J]. 高压物理学报, 2013, 27(4): 481-489. doi: 10.11858/gywlxb.2013.04.002
JIANG Xi, ZHOU Wen-Ge, XIE Hong-Sen, LIU Yong-Gang, FAN Da-Wei. Compressional and Shear Wave Velocities of Rock Glasses up to 2.0 GPa and 1 000 ℃[J]. Chinese Journal of High Pressure Physics, 2013, 27(4): 481-489. doi: 10.11858/gywlxb.2013.04.002
Citation: JIANG Xi, ZHOU Wen-Ge, XIE Hong-Sen, LIU Yong-Gang, FAN Da-Wei. Compressional and Shear Wave Velocities of Rock Glasses up to 2.0 GPa and 1 000 ℃[J]. Chinese Journal of High Pressure Physics, 2013, 27(4): 481-489. doi: 10.11858/gywlxb.2013.04.002

高温高压下几种岩石熔融玻璃的弹性波速

doi: 10.11858/gywlxb.2013.04.002
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    通讯作者:

    蒋玺 E-mail:xjiang235@163.com

Compressional and Shear Wave Velocities of Rock Glasses up to 2.0 GPa and 1 000 ℃

  • 摘要: 利用超声波脉冲反射法和透射-反射联合法,测量了压力在0.4~2.0 GPa条件下7种岩石熔融玻璃的纵波波速(vp)和横波波速(vs),并在恒压2.0 GPa下,在0~1 000 ℃和0~730 ℃温度范围内,分别测量了纵波波速和横波波速随温度的变化。结果显示,室温下随着压力的升高,大多数玻璃的vp和全部玻璃的vs异常地降低。异常的波速-压力关系与玻璃中SiO2的含量密切相关,随着SiO2的质量分数从87%降低到52%,玻璃的纵波波速和横波波速对于压力的导数分别从-0.159和-0.114 m/(sPa)升高到0.050和-0.001 m/(sPa)。分析认为,玻璃的波速随压力升高而降低的原因主要与玻璃中SiO2所具有的敞型结构有关。在2.0 GPa压力下,玻璃的波速首先随温度升高而缓慢降低,当达到600~700 ℃后,开始快速下降,设此温度为玻璃的转变温度Tg。根据实验测得的玄武岩玻璃波速,结合上地幔二辉橄榄岩的弹性性质,推测若在上地幔岩石中存在体积分数大于20%的玄武岩质非晶质体,上地幔便可能形成地震波低速层。

     

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出版历程
  • 收稿日期:  2011-10-08
  • 修回日期:  2012-04-01
  • 发布日期:  2013-08-15

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