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2.0GPa、室温至1200℃条件下斜长角闪岩的纵波速度及其衰减

DOI: 10.11858/gywlxb.2002.03.003, PP. 176-182

Keywords: 斜长角闪岩,高温高压,部分熔融,纵波速度,衰减

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Abstract:

利用YJ-3000t压力机,在2.0GPa、室温至1200℃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。

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