0.5~4.0 GPa、100~300 ℃条件下辉长岩弹性波速及衰减特征

陈志 杜建国 周文戈 刘永刚 李营

陈志, 杜建国, 周文戈, 刘永刚, 李营. 0.5~4.0 GPa、100~300 ℃条件下辉长岩弹性波速及衰减特征[J]. 高压物理学报, 2009, 23(5): 338-344 . doi: 10.11858/gywlxb.2009.05.004
引用本文: 陈志, 杜建国, 周文戈, 刘永刚, 李营. 0.5~4.0 GPa、100~300 ℃条件下辉长岩弹性波速及衰减特征[J]. 高压物理学报, 2009, 23(5): 338-344 . doi: 10.11858/gywlxb.2009.05.004
CHEN Zhi, DU Jian-Guo, ZHOU Wen-Ge, LIU Yong-Gang, LI Ying. Wave Velocity and Attenuation Characteristics of Gabbro at 100~300 ℃ and 0.5~4.0 GPa[J]. Chinese Journal of High Pressure Physics, 2009, 23(5): 338-344 . doi: 10.11858/gywlxb.2009.05.004
Citation: CHEN Zhi, DU Jian-Guo, ZHOU Wen-Ge, LIU Yong-Gang, LI Ying. Wave Velocity and Attenuation Characteristics of Gabbro at 100~300 ℃ and 0.5~4.0 GPa[J]. Chinese Journal of High Pressure Physics, 2009, 23(5): 338-344 . doi: 10.11858/gywlxb.2009.05.004

0.5~4.0 GPa、100~300 ℃条件下辉长岩弹性波速及衰减特征

doi: 10.11858/gywlxb.2009.05.004
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    通讯作者:

    杜建国

Wave Velocity and Attenuation Characteristics of Gabbro at 100~300 ℃ and 0.5~4.0 GPa

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    Corresponding author: DU Jian-Guo
  • 摘要: 报道了100~300 ℃、0.5~4.0 GPa条件下辉长岩纵波速度(vP)和横波速度(vS),并且根据品质因子(QP、QS)的变化讨论了该条件下辉长岩的物性特征及其地震地质意义。实验结果表明:压力为0.5~4.0 GPa时,固定温度下辉长岩vP、vS、QP、QS随压力增大而递增,并且在0.5~2.3 GPa压力范围内它们随压力的变化率比在2.3~4.0 GPa范围内的大;固定压力下,温度从100 ℃增至300 ℃时,辉长岩vP、vS、QP、QS呈线性下降趋势。进一步分析得到:在0.5~2.3 GPa压力下,随着压力的增加辉长岩样品不断被压缩,样品的连续性变好,弹性加强,弹性波衰减变小,波速与Q值升高;在2.3~4.0 GPa压力下,样品被压密,样品接近连续弹性介质,弹性波衰减很小,波速与Q值的变化速率变小;在温度为100~300 ℃条件下,辉长岩样品内部以膨胀为主,样品密度变小,弹性波速与Q值呈线性下降趋势。研究结果表明,在岩石圈内构造应力局部集中会导致岩石Q值增大,岩石破裂、热物质局部聚集会导致岩石Q值降低,这也解释了地震前后观测到的震源区Q值的类似变化。

     

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出版历程
  • 收稿日期:  2008-12-31
  • 修回日期:  2009-02-20
  • 发布日期:  2009-10-15

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