熔体输送期间的热不平衡：岩石圈-软流圈边界演化的意义
Thermal disequilibrium during melt-transport: Implications for the evolution of the lithosphere-asthenosphere boundary
摘要：
本研究探讨如何在熔体渗透和熔体岩石相互作用的热不平衡可能会改变大陆岩石圈从下面。使用一个理想化的1D模型之间的熔体丰富的渠道和周围的熔体穷人的材料的热不平衡，我估计在通道化的熔体运输在岩石圈软流圈边界（LAB）的通道壁的热交换。对于地质合理的通道的体积分数（$ϕ$），通道壁的相对速度（$v$），通道间距（$d$），和时间尺度的情节熔体渗透（$τ$），模型结果表明，不平衡加热可能有助于$>$ $10^{-3}$ W/m $^3$的LAB热预算。在幕式熔渗过程中，在实验室形成了一个与时空变化的不平衡热交换相关联的热再加工区。TRZ增长的瞬态迁移的不平衡加热前在材料依赖的速度，达到最大的稳态宽度$δ\sim$ $\left[ϕvd^{-2}τ^{2} \right]$。与TRZ的建立相关的时空尺度与基于大陆板内环境（如美国西部）的地质观测推断的LAB迁移的时空尺度相当。
英文摘要：
This study explores how thermal disequilibrium during melt-infiltration and melt-rock interaction may modify the continental lithosphere from beneath. Using an idealized 1D model of thermal disequilibrium between melt-rich channels and the surrounding melt-poor material, I estimate heat exchange across channel walls during channelized melt transport at the lithosphere-asthenosphere boundary (LAB). For geologically-reasonable values of the volume fraction of channels ($ϕ$), relative velocity across channel walls ($v$), channel spacing ($d$), and the timescale of episodic melt-infiltration ($τ$), model results suggest disequilibrium heating may contribute $>$ $10^{-3}$ W/m$^3$ to the LAB heat budget. During episodic melt-infiltration, a thermal reworking zone (TRZ) associated with spatio-temporally varying disequilibrium heat exchange forms at the LAB. The TRZ grows by the transient migration of a disequilibrium-heating front at material-dependent velocity, reaching a maximum steady-state width $δ\sim$ $\left[ϕvd^{-2}τ^{2} \right]$. The spatio-temporal scales associated with establishment of the TRZ are comparable with those inferred for the migration of the LAB based on geologic observations within continental intra-plate settings, such as the western US.
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