Towards timescales of assimilation and magma mixing in the Large Igneous Province of Snake River Plain-Yellowstone, northwest United States

蛇河平原和黄石（SRP-Y）火山区的岩浆喷发的气息提供了一个独特的机会，研究热点相关的热异常与大陆地壳的相互作用和岩浆库的后续发展。作为一个水库的形成，原始岩浆批次诱导地壳熔融和同化，混合。由更原始的岩浆的补给引起的混合预计伴随着可能阻碍分馏的储层加热，从而先于分馏。SRP-Y记录了这种化学过程的故事，因此提供了描绘岩浆演化的拼图。提出了一系列的测试，以系统地表征的演变和混合的重要性，在生命周期的水库美联储的热点。这项工作的目的是（1）确定SRP中的端元，以及（2）表征其物理（例如，密度，粘度）和化学（例如，间隙熔体的组成、挥发物含量）性质。在第二阶段，这项工作将（3）评估SRP-Y系统中所涉及的岩浆的物理和化学性质之间的相互作用;（4）限制SRP岩浆库中同化和混合时间尺度的变化。

The breath of magma diversities in the Snake River Plain and Yellowstone (SRP-Y) volcanic fields presents a unique opportunity to study the interaction of a hot-spot-related thermal anomaly with the continental crust and the subsequent development of magma reservoirs. As a reservoir forms, primitive magma batches induce crustal melting and assimilation, and mixing. Mixing caused by a recharge of a more primitive magma is expected to be accompanied by heating of the reservoir which may obstruct fractionation and thus to precede it. The SRP-Y holds the tale of this chemical process and therefore provides the pieces of the puzzle portraying the evolution of magmas. A series of tests is proposed to systematically characterize the evolution and importance of mixing during the lifetime of reservoirs fed by a hotspot. This work aims to (1) identify end members in the SRP, and (2) to characterize their physical (e.g., density, viscosity) and chemical (e.g., interstitial melt’s composition, volatile content) properties. In a second phase, this work will (3) assess the interaction between physical and chemical properties of the magmas involved in the SRP-Y systems; and (4) constrain changes in the timescale of assimilation and mingling in the SRP magma reservoirs.