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Pre-eruptive magmatic processes re-timed using a non-isothermal approach to magma chamber dynamics

机译:喷发前的岩浆过程使用非等温方法重新确定了岩浆室动力学的时间

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摘要

Constraining the timescales of pre-eruptive magmatic processes in active volcanic systems is paramount to understand magma chamber dynamics and the triggers for volcanic eruptions. Temporal information of magmatic processes is locked within the chemical zoning profiles of crystals but can be accessed by means of elemental diffusion chronometry. Mineral compositional zoning testifies to the occurrence of substantial temperature differences within magma chambers, which often bias the estimated timescales in the case of multi-stage zoned minerals. Here we propose a new Non-Isothermal Diffusion Incremental Step model to take into account the non-isothermal nature of pre-eruptive processes, deconstructing the main core-rim diffusion profiles of multi-zoned crystals into different isothermal steps. The Non-Isothermal Diffusion Incremental Step model represents a significant improvement in the reconstruction of crystal lifetime histories. Unravelling stepwise timescales at contrasting temperatures provides a novel approach to constraining pre-eruptive magmatic processes and greatly increases our understanding of magma chamber dynamics.
机译:限制活跃火山系统中喷发前岩浆过程的时标对于理解岩浆室动力学和火山爆发的触发因素至关重要。岩浆过程的时间信息被锁定在晶体的化学分区剖面内,但是可以通过元素扩散计时法获得。矿物成分分区证明了岩浆室内温度的显着差异,在多级带状矿物的情况下,这常常会偏差估计的时间尺度。在这里,我们提出了一个新的非等温扩散增量步长模型,以考虑喷发前过程的非等温性质,将多区域晶体的主要核-边缘扩散剖面解构为不同的等温步长。非等温扩散增量步长模型代表了晶体寿命历史重建中的重大改进。在不同的温度下揭示逐步的时间尺度提供了一种新颖的方法来约束喷发前的岩浆过程,并极大地增进了我们对岩浆室动力学的理解。

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