Permeability anisotropy of serpentinite and fluid pathways in a subduction zone
Permeability anisotropy of serpentinite and fluid pathways in a subduction zone
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DOI：
10.1130/g32173.1
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发表时间：
2011-10-01
期刊：
影响因子：
5.8
通讯作者：
Okazaki, Keishi
中科院分区：
文献类型：
--
作者：
Kawano, Seiya;Katayama, Ikuo;Okazaki, Keishi
流体流动实验的结果表明，在高度剪切蛇纹岩的渗透率显着的各向异性。在围压高达50 MPa的情况下，平行于蛇纹岩叶理的流体流动比垂直于叶理的流体流动高一个数量级或更高。虽然浮力是地幔流体向上流动的驱动力，但渗透率的强各向异性导致流体沿沿着俯冲板块界面优先迁移，预计会发生广泛的塑性变形和强烈的晶体择优取向。地幔楔中相对薄的含水层的发展与高度各向异性的流体迁移而不是垂直流动的发生是一致的。
The results of fluid-flow experiments revealed a significant permeability anisotropy in highly sheared serpentinite. Fluid flow parallel to serpentinite foliation is an order of magnitude or more higher than that normal to the foliation at confining pressures as high as similar to 50 MPa. Although buoyancy is the driving force of upward fluid flow in the mantle, the strong anisotropy in permeability results in preferential fluid migration along the subducting plate interface, where extensive plastic deformation and a strong crystal-preferred orientation are expected to occur. The development of a relatively thin hydrous layer in the mantle wedge is consistent with the occurrence of highly anisotropic fluid migration rather than vertical flow.