【摘要】 本文采用热弹性有限元数值模拟方法,计算二维情况下部分熔融花岗岩的纵波速度(Vp),分析熔体含量及熔体分布形态对于花岗岩纵波速度的影响.模拟结果表明花岗岩的Vp随着熔体含量的增加而降低,当熔体含量为7%～13%时,Vp可降至5.6～5.8km/s.熔体的形状对于Vp也有影响,当熔体以菱形形状分布于岩石中时,沿菱形长轴方向Vp减小幅度更大,在熔体含量达到15%时,沿菱形长轴方向的Vp减小达到20%,而在短轴方向仅4%.当熔体聚集成条带时,不同方向得到的Vp呈现明显的差异,表明熔体的定向排列不仅会使纵波速度呈现大幅度的减小,而且会引起地震波的各向异性.更多还原

【Abstract】 In this paper,we calculate the Vp of 2D partially molten granite using thermal elastic finite element simulation,to study how the melt content and the melt shape to affect the granite wave velocity.The results show Vp decreases with the melt content,and Vp reduces to 5.6~5.8 km/s when the melt content is 7%~13%.The melt shape also effects the Vp.When the melt distributes randomly in the rock as rhombus,Vp decreases more quickly along the long axis.Vp decreases by 20% along the long axis as the melt content is 15%,while only 4% along the short axis.Vp of the partially molten aggregate varies with the directions.It shows that the partially molten aggregate not only decreases the Vp more quickly,but also lead to the seismic wave anisotropy.更多还原