Thermal disequilibrium during melt-transport: Implications for the evolution of the lithosphere-asthenosphere boundary

摘要: This study explores melt-infiltration and melt-rock interaction as a means of shaping the continental lithosphere from beneath. Specifically, we focus upon role thermal disequilibrium between melt surrounding solid for heating modifying lithospheric mantle. We use simple pore-network models to estimate importance ambient mantle by with transported in channels at base lithosphere. The key physical parameters that control behavior are fluid volume fraction ($\phi$), relative fluid-solid velocity ($v_{fluid}$), channel spacing ($d$), timescale episodic ($\tau$). Model results scaling arguments suggest geologically-reasonable values these parameters, may contribute more than 10$^{-3}$ W/m$^3$ heat budget lithosphere-asthenosphere boundary. find there exists scale associated transient upward motion front. During melt-infiltration, predict existence reworking zone (TRZ) spatio-temporally varying exchange. steady-state width TRZ is shown $\sim \left[\phi v_{fluid}d^{2}\tau^{2} \right]$. spatio-temporal scales establishment comparable those migration boundary inferred geologic observations within intra-plate settings, such western US.