Large volcanic eruptions are frequently triggered by the intrusion of hot primitive magma into a more evolved magma-chamber or -mush zone. During intrusion into the cooler mush zone, the basaltic magma undergoes crystallization, which in turn can release heat and volatiles to the mush. This should cause a drop in bulk mush-viscosity, potentially leading to its mobilization and even eruption. The non-linear changes in the transport properties of both magmas during this interaction also modulate how the magmas accommodate deformation during both interaction and ascent. As such, this interaction represents a complex disequilibrium phenomenon, during which the material properties guiding the processes (dominantly viscosity) are in constant evolution. This scenario highlights the importance of non-isothermal sub-liquidus processes for the understanding of natural magmatic and volcanic systems and underlines the need for a rheological database to inform on, and to model, this interaction process. Here we present new experimental data on the disequilibrium rheology of the least evolved end-member known to be involved in magma mixing and eruption triggering as well as lava flow processes in the Phlegrean volcanic district (PVD). We measure the melt's subliquidus rheological evolution as a function of oxygen fugacity and cooling rate and map systematic shifts in its rheological “cut off temperature; T_cutoff” (i.e., the point where flow ceases). The data show that (1) the rheological evolution and solidification behavior both depend on the imposed cooling-rate, (2) decreasing oxygen fugacity decreases the temperature at which the crystallization onset occurs and modifies the kinetics of melt crystallization and (3) the crystallization kinetics produced under dynamic cooling are significantly different than those observed at or near equilibrium conditions. Based on the experimental data we derive empirical relationships between the environmental parameters and T_cutoff. These empirical descriptions of solidification and flow may be employed in numerical models aiming to model lava flow emplacement or to reconstruct the thermomechanical interaction between basalts and magma mush systems. We further use the experimental data in concert with existing models of particle suspension rheology to derive the disequilibrium crystallization kinetics of the melt and its transition from crystallization to glass formation.

频繁的火山喷发通常是由热的原始岩浆侵入到更加演化的岩浆腔或-淤浆带中引起的。在侵入较冷的糊状区的过程中，玄武岩浆会发生结晶，这反过来又会向糊状体释放热量和挥发物。这将导致散装糊状粘度下降，可能导致其动员甚至喷发。在这种相互作用期间，两个岩浆的传输特性的非线性变化也调节了岩浆在相互作用和上升过程中如何适应变形。这样，这种相互作用代表了复杂的不平衡现象，在此期间，指导过程的材料特性（主要是粘度）不断变化。这种情况突显了非等温亚液相线过程对于理解天然岩浆和火山系统的重要性，并强调了需要流变数据库来为这种相互作用过程提供信息并进行建模。在这里，我们介绍了最不发达的末端成员不平衡流变的新实验数据，该末端成员参与了Phlegrean火山区（PVD）的岩浆混合和喷发触发以及熔岩流过程。我们根据氧逸度和冷却速率测量熔体的亚液相流变学演变，并绘制出其流变学“截止温度”的系统变化图。Ť 在这里，我们介绍了最不发达的末端成员不平衡流变的新实验数据，该末端成员参与了Phlegrean火山区（PVD）的岩浆混合和喷发触发以及熔岩流过程。我们根据氧逸度和冷却速率测量熔体的亚液相流变学演变，并绘制出其流变学“截止温度”的系统变化图。Ť 在这里，我们介绍了最不发达的末端成员不平衡流变的新实验数据，该末端成员参与了Phlegrean火山区（PVD）的岩浆混合和喷发触发以及熔岩流过程。我们根据氧逸度和冷却速率测量熔体的亚液相流变学演变，并绘制出其流变学“截止温度”的系统变化图。Ť_截止”（即流量停止的点）。数据表明（1）流变演化和凝固行为均取决于所施加的冷却速率；（2）降低氧气逸度会降低发生结晶的温度并改变熔体结晶的动力学；（3）结晶在动态冷却下产生的动力学与在平衡条件下或接近平衡条件下观察到的动力学显着不同。根据实验数据，我们得出环境参数与T_截止值之间的经验关系。这些凝固和流动的经验描述可用于数值模型，其目的是模拟熔岩流进位或重建玄武岩与岩浆糊状系统之间的热机械相互作用。我们进一步将实验数据与现有的颗粒悬浮流变模型相结合，得出熔体的不平衡结晶动力学及其从结晶到玻璃形成的过渡。