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首页> 外文期刊>Geochemistry, geophysics, geosystems >Questions on the existence, persistence, and mechanical effects of a very small melt fraction in the asthenosphere
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Questions on the existence, persistence, and mechanical effects of a very small melt fraction in the asthenosphere

机译：关于软流圈中很小的熔体分数的存在，持久性和机械效应的问题

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This paper integrates current questions in rock physics on the effects and behavior of very small melt fractions ( 1%) in the asthenosphere. In experiment and theory, it has been shown that a very small melt fraction forming a connected network has a large effect on the diffusion creep shear viscosity, as well as in the anelastic behavior. Because small concentrations of volatiles, particularly H2O and CO2, significantly lower the peridotite solidus, a small melt fraction is expected in the asthenosphere. Even with connected networks, permeability will be low and surface tension will generate a strong force resisting complete draining of small melt fractions. The anelastic reduction of shear velocity due to melt could cause a 5% shear velocity contrast across the solidus, consistent with the contrast measured on features in the shallow suboceanic upper mantle that are often interpreted as the lithosphere-asthenosphere boundary.
机译：本文综合了岩石物理学中目前在软流圈中很小的熔体分数（ 1％）的影响和行为问题。在实验和理论上，已经表明形成连接网络的非常小的熔体分数对扩散蠕变剪切粘度以及非弹性行为具有很大的影响。由于少量的挥发物，尤其是H2O和CO2，会显着降低橄榄岩的固相线，因此软流圈中的熔体分数也很小。即使有连接的网络，渗透率也会很低，表面张力会产生强大的力，无法完全排出少量的熔体。由于熔体而导致的剪切速度的非弹性降低可能导致整个固相线的剪切速度反差为5％，这与通常被解释为岩石圈-软流圈边界的浅层洋底上地幔特征的反差一致。

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