Signals from the Campi Flegrei hydrothermal system: Role of a “magmatic” source of fluids
Signals from the Campi Flegrei hydrothermal system: Role of a “magmatic” source of fluids
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来自 Campi Flegrei 热液系统的信号：“岩浆”流体源的作用
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
M. Todesco
中科院分区：
文献类型：
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作者：
M. Todesco
[1]这是一个参数的研究，进行调查的信号所产生的热液系统的岩浆流体的脉动源。本研究的重点是选定的属性的来源上的热液活动在Campi Flegrei，意大利的演变的影响。对多相多组分热液系统进行了数值模拟。每个模拟都描述了一个短暂的动荡阶段，然后是一个长期的平静期。在扰动期间，流体源的特定性质（流速、流体成分、源大小和扰动持续时间）相对于选定的基线值被修改。系统的演变是通过观察两个参数来跟踪的，这两个参数可以在活跃的火山地区进行监测：火山气体的成分和重力变化。结果描述了这两个观测量的时间演化，并允许比较不同的源属性的影响。所有模拟的动荡事件都会引起气体成分和重力的可测量变化。对于所考虑的几何和系统属性，这些变化总是持续到动荡时期结束之后，并且通常可以持续数十年。流体流速是影响可观测演化的主要源属性。重力比气体成分对源性质更敏感，并且它经历最大和最快的变化。结果还突出了岩石性质和初始条件在这些可观察到的信号的演变中的主要作用。
[1] This is a parametric study that was carried out to investigate the signals generated by a hydrothermal system fed by a pulsating source of magmatic fluids. This study focuses on the effects that selected properties of the source have on the evolution of hydrothermal activity at Campi Flegrei, Italy. Numerical simulations are carried out to describe a multiphase and multicomponent hydrothermal system. Each simulation describes a short unrest phase, followed by a prolonged quiet period. During the unrest, specific properties of the fluid source (flow rate, fluid composition, source size, and unrest duration) are modified with respect to selected baseline values. The evolution of the system is tracked by looking at two parameters that can be monitored in active volcanic areas: the composition of fumarolic gases and gravity changes. The results describe the temporal evolution of these two observables and allow comparisons of the effects of different source properties. All of the simulated unrest events cause measurable changes in gas composition and gravity. For the geometry and system properties considered, these changes always last beyond the end of the unrest period, and can often persist for decades. Fluid flow rate is the source property that mostly affects the observable evolution. Gravity is more sensitive to source properties than gas composition, and it undergoes the largest and quickest changes. The results also highlight the major role that rock properties and initial conditions have in the evolution of these observable signals.