The compositional zoning styles of natural crystals produced during magma intrusion can be used to investigate the structure of magmatic plumbing systems and its relation to expressions of volcanic unrest (seismic, deformation, volatiles). However, magma intrusion is a progressive, dynamic process and yields non-monotonic heterogeneities in physio-chemical variables such as complex spatial variations in temperature and liquid composition with time. Such changes in variables are difficult to incorporate in models of crystal zoning in natural systems. Here we take another approach by integrating the results of a numerical multiphase simulation of melt arrival in an olivine-rich reservoir with models of chemical re-equilibration of olivine. We evaluate the diversity of chemical zoning styles and the inferred time scales using Fe–Mg diffusion in olivine for a limited range of system geometries and time-composition-temperature values. Although our models are still a large simplification of the processes that may occur in natural systems we find several time-dependent and systematic relations between variables that can be used to better interpret natural data. The proportions of zoned and unzoned crystals, the zoning length scales, and the calculated diffusion times from the crystals, vary with time and the initial position of the crystal in the reservoir. These relationships can be used, for example, to better constrain the plumbing structure and dynamics of mafic eruptions from monogenetic volcanoes by detailed studies of changes in the zoning of the crystal cargo with eruptive sequence. Moreover, we also find that the time scales obtained from modeling of crystals at a single temperature and boundary condition tend to be shorter (> about 25%) than the residence time, which could also be tested in natural studies by combining crystal time scale records with monitoring datasets.

中文翻译：

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模拟岩浆侵入过程中流体动力学与橄榄石晶体尺度分带的关联

岩浆侵入过程中产生的天然晶体的成分分带样式可用于研究岩浆管道系统的结构及其与火山动荡表现（地震、变形、挥发分）的关系。然而，岩浆侵入是一个渐进的、动态的过程，并在物理化学变量中产生非单调的异质性，例如温度和液体成分随时间的复杂空间变化。这种变量的变化很难纳入自然系统中的晶体分区模型。在这里，我们采用另一种方法，将熔体到达富含橄榄石的储层的多相数值模拟结果与橄榄石的化学再平衡模型相结合。我们使用橄榄石中的 Fe-Mg 扩散来评估化学分区类型的多样性和推断的时间尺度，适用于有限范围的系统几何形状和时间 - 组成 - 温度值。尽管我们的模型仍然是对自然系统中可能发生的过程的大量简化，但我们发现变量之间存在多种与时间相关的系统关系，可用于更好地解释自然数据。分带和未分带晶体的比例、分带长度尺度和从晶体计算的扩散时间随时间和晶体在储层中的初始位置而变化。可以使用这些关系，例如，通过详细研究具有喷发序列的晶体货物分区的变化，更好地限制单生火山基性火山喷发的管道结构和动力学。此外，我们还发现在单一温度和边界条件下模拟晶体获得的时间尺度往往比停留时间更短（> 约 25%），这也可以通过结合晶体时间尺度记录在自然研究中进行测试带有监控数据集。