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本文给出细粒橄榄石集合体在位错蠕变域中压力效应的实验结果。对干燥、人工合成的橄榄石集合体进行了三轴压缩实验,试验在一台高分辨率的气体介质试验机上进行。典型的常载荷蠕变试验温度为1473K或1523K,围压为400MPa、200MPa、400MPa、200MPa。当差压力和温度给定时,试件在400MPa围压下,变形速度较200MPa围压下要慢。实验得出的细粒橄榄石集合体在位错蠕变域中的活化体积值为(23±3)×10~(-6)m~3/mol。最后,对实验结果在地幔动力学中的应用进行了讨论。
This paper presents the experimental results of the pressure effect of fine-grained olivine aggregates in the dislocation creep domain. Three-axis compression experiments were conducted on dry, synthetic olivine aggregates. The experiments were performed on a high-resolution gas media testing machine. Typical constant load creep test temperature of 1473K or 1523K, confining pressure of 400MPa, 200MPa, 400MPa, 200MPa. When the differential pressure and temperature given, the specimen in the confining pressure of 400MPa, the deformation rate is slower than the 200MPa confining pressure. The volume of activated olivine aggregate in the dislocation creep domain was (23 ± 3) × 10 -6 m 3 / mol. Finally, the application of experimental results in mantle dynamics is discussed.