The effect of pressure on the rheology of olivine

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。The experimental results of the effect of pressure on the dislocation creep behavior of fine-grained San Carlos olivine were presented in this paper. Compressive creep experiments on dry, synthetic aggregates of olivine were conducted using a high-resolution gas-medium deformation apparatus. In a typical constant-temperature experiment at either 1473 or 1523 K, a sample was first deformed at 400 MPa, then at 200 MPa, and then again at 400 and 200 MPa, respectively. The corresponding value of the activation volume for dislocation creep of fine grained olivine is (23 +/- 3) X 10(-6) m(3)/mol. The possible application of our test results to the mantle dynamic process of earth was discussed as well.SCI(E)中文核心期刊要目总览(PKU)中国科技核心期刊(ISTIC)中国科学引文数据库(CSCD)503577-5821