Evidence of thermal-driven processes triggering the 2005-2014 unrest at Campi Flegrei caldera
Evidence of thermal-driven processes triggering the 2005-2014 unrest at Campi Flegrei caldera
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DOI：
10.1016/j.epsl.2015.01.012
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发表时间：
2015-03-15
影响因子：
5.3
通讯作者：
Petrillo, Zaccaria
中科院分区：
文献类型：
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作者：
Chiodini, Giovanni;Vandemeulebrouck, Jean;Petrillo, Zaccaria
10年前开始的地面变形加速过程目前正在影响Campi Flegrei破火山口。这里解释的变形模式与两个过程的重叠：短时间脉冲所造成的岩浆流体注入到热液系统;和一个长时间的加热过程的岩石。通过将地面变形的残差（用加速多项式函数拟合）与喷气CO2/CH 4和He/CH 4比（这是岩浆气体到达的良好地球化学指标）进行比较，突出了短脉冲。这两个独立的数据集显示了相同的五个峰值序列，地球化学信号相对于大地测量信号的延迟类似于200天。热液系统的加热，它平行于长周期加速曲线，推断的温度-压力气体地质指标。参考最近的解释，涉及到开放系统的岩浆脱气的惰性气体物种的变化，我们推断，加热是由富集水的岩浆流体和增加他们的流量。岩浆流体对岩石的加热可能是引发火山口动荡的一个核心因素。(C)2015 Elsevier B. V.版权所有。
An accelerating process of ground deformation that began 10 years ago is currently affecting the Campi Flegrei caldera. The deformation pattern is here explained with the overlapping of two processes: short time pulses that are caused by injection of magmatic fluids into the hydrothermal system; and a long time process of heating of the rock. The short pulses are highlighted by comparison of the residuals of ground deformation (fitted with an accelerating polynomial function) with the fumarolic CO2/CH4 and He/CH4 ratios (which are good geochemical indicators of the arrival of magmatic gases). The two independent datasets show the same sequence of five peaks, with a delay of similar to 200 days of the geochemical signal with respect to the geodetic signal. The heating of the hydrothermal system, which parallels the long-period accelerating curve, is inferred by temperature-pressure gas geoindicators. Referring to a recent interpretation that relates variations in the fumarolic inert gas species to open system magma degassing, we infer that the heating is caused by enrichment in water of the magmatic fluids and by an increment in their flux. Heating of the rock caused by magmatic fluids can be a central factor in triggering unrest at calderas. (C) 2015 Elsevier B.V. All rights reserved.