The architecture of a mush-dominated plumbing system in active volcanic areas conditions the magma pathways feeding eruptions. Open-system processes along these pathways and the associated time scales are directly related to monitoring data and eruptive behavior. Despite crystal mush–dominated systems being common in active volcanoes, previous studies have not focused on the integration of data from the mush sectors feeding different eruptions, supplying a partial view of the pre-eruptive magmatic processes and hindering the interpretation of the monitoring signals during unrest periods. We focus on the Marsili seamount (Tyrrhenian Sea), where the mineral data document processes within a magmatic system vertically extended throughout the local oceanic crust and made of a mush framework spotted with eruptible melt- and crystal-rich pockets. We undertook a study of Marsili olivine crystals that constrains the time scales of three pre-eruptive scenarios, dominated by open-system processes: (1) disaggregation of the deep Marsili volcano mush zone that occurred over a time scale of years prior to the eruption; (2) rapid ascent (days) of mantle-derived basaltic magma that, in some cases, intercepts shallow plagioclase-rich pockets; and (3) multiple mixing events between melt- and crystal-rich mush zones occurring approximately 1–2 mo and 0.5–3 yr before the eruption. Our results highlight the importance of contemporaneously studying eruptions in different locations on a volcano edifice for a better comprehension on how mush-dominated plumbing systems work as a whole and how this must be considered during the interpretation of monitoring data.

中文翻译：

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复杂异构糊状管道系统中开放系统过程的时间尺度

在活跃的火山地区，以糊状物为主的管道系统的架构为岩浆通道提供了喷发的条件。沿着这些路径的开放系统过程和相关的时间尺度与监测数据和喷发行为直接相关。尽管以晶体糊状物为主的系统在活火山中很常见，但以前的研究并未集中于整合来自不同喷发的糊状物部门的数据，提供喷发前岩浆过程的部分视图并阻碍对监测信号的解释动荡时期。我们专注于马西里海山（第勒尼安海），那里的矿物数据记录了一个岩浆系统内的过程，该岩浆系统垂直延伸到整个当地的海洋地壳，并由一个带有可喷发的富含熔体和富含晶体的口袋的糊状框架构成。我们对马西里橄榄石晶体进行了一项研究，该研究限制了三种喷发前情景的时间尺度，主要是开放系统过程：（1）在喷发前数年的时间尺度内发生的深马西里火山糊状带的分解; (2) 源自地幔的玄武质岩浆快速上升（数天），在某些情况下，会拦截富含斜长石的浅层；（3）在喷发前大约 1-2 个月和 0.5-3 年发生在熔融和富含晶体的糊状区之间的多次混合事件。我们的研究结果强调了同时研究火山大厦不同位置的喷发的重要性，以便更好地理解以糊状物为主的管道系统如何作为一个整体工作，以及在解释监测数据时必须如何考虑这一点。