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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Magma dynamics during the 2007 Stromboli eruption (Aeolian Islands, Italy): Mineralogical, geochemical and isotopic data
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Magma dynamics during the 2007 Stromboli eruption (Aeolian Islands, Italy): Mineralogical, geochemical and isotopic data

机译：2007年斯特龙博利火山爆发期间的岩浆动力学（意大利风神群岛）：矿物学，地球化学和同位素数据

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摘要

After the 6 month-long effusive event of 2002-2003, a new lava effusion occurred at Stromboli between 27 February and 2 April 2007. Despite the different durations, approximately the same volume of magma was emitted in both eruptions, in the order of 10~7 m~3. A paroxysmal eruption occurred at the summit craters in both the 2002-2003 and 2007 episodes, during which a significant amount of low porphyritic (LP), volatile-rich magma was erupted. In both cases, the paroxysm did not interrupt the lava emission. Here, we present compositional data, including texture, mineralogy, chemistry and Sr and Nd isotope ratios of bulk-rock, groundmass and separated minerals of lavas erupted in 2007, together with chemistry and Sr and Nd isotope composition of the pumices emitted during the 15 March paroxysm. As a whole, the lavas have the same texture and chemistry that characterize the highly porphyritic (HP) products usually erupted at Stromboli during normal Strombolian activity and effusive events. Compared to the previous HP products, the 2007 lavas show minor but systematic mineralogical and isotopic variations which are consistent with a modest increase of the magma supply rate of the volcano. Compositional variations during the entire duration of the event are very modest. Glass chemistry changes in lavas erupted in the second half of March can be explained by the minor mixing between the volatile-rich LP magma rising through the shallow magmatic system during the 15 March paroxysm and the degassed residing HP magma. A first conclusion of this study is that there is no compositional evidence supporting major changes in the magma dynamics of the volcano accompanying the effusive activity, as also suggested for the 2002-2003 event. The activity of Stromboli is controlled by a steady state feeding system in which refilling, mixing, degassing and crystallization at shallow level continuously operate, with modest oscillations in the magma supply rate. Switching between normal Strombolian and effusive activity is related to periods of relatively more vigorous refilling of the shallow system, leading to progressive pressure increase in the upper conduits associated with only minor compositional variations in the erupted products.
机译：在2002-2003年为期6个月的喷发事件之后，2007年2月27日至4月2日在斯特龙博利爆发了新的熔岩喷出。尽管持续时间不同，但两次喷发的岩浆喷出量大致相同，约为10倍。 〜7 m〜3。在2002-2003年和2007年的两次爆发中，山顶火山口均发生了阵发性喷发，在此期间爆发了大量的低斑状（LP），富含挥发物的岩浆。在这两种情况下，阵发性都不会中断熔岩排放。在这里，我们提供了组成数据，包括质地，矿物学，化学性质以及2007年爆发的熔岩的块状岩石，地面质量和分离矿物的Sr和Nd同位素比率，以及15期间排放的浮石的化学成分，Sr和Nd同位素组成三月发作。总体而言，熔岩具有相同的质地和化学性质，这些特征和特征通常是在正常的Strombolian活动和喷发事件期间在Stromboli爆发的高斑状（HP）产品。与以前的HP产品相比，2007年的熔岩显示出微小但系统的矿物学和同位素变化，这与火山岩浆供应量的适度增加相一致。在整个活动期间，成分变化非常小。 3月下半月爆发的熔岩的玻璃化学变化可以通过3月15日阵发性高挥发分LP岩浆通过浅岩浆系统上升与脱气后的HP岩浆之间的微小混合来解释。这项研究的第一个结论是，没有证据表明火山岩浆动力学伴随着喷发活动发生了重大变化，正如2002-2003年事件所暗示的那样。 Stromboli的活动由稳定的进料系统控制，在该系统中，浅层的充填，混合，脱气和结晶连续不断地进行，同时岩浆供应速率出现适度的波动。正常的Strombolian和喷发活动之间的转换与浅层系统的相对充满力的时期有关，导致上部导管中的逐渐增加的压力与喷出产品中的微小成分变化有关。

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  • 来源
    《Journal of Volcanology and Geothermal Research》 |2009年第4期|255-268|共14页
  • 作者

    P. Landi; R.A. Corsaro; L. Francalanci; L. Civetta; L. Miraglia; M. Pompilio; R. Tesoro;

  • 作者单位

    Istituto Nazionale di Geofisica e Vukanologia, Sezione di Pisa, Via delta Faggiola, 32,I-56126 Pisa, Italy;

    Istituto Nazionale di Geofisica e Vukanologia, Sezione di Catania, Piazza Roma, 2,195125 Catania, Italy;

    Dipartimento di Scienze delta Terra, Universita di Firenze, Via La Pira, 4,I-50121 Firenze, Italy;

    Dipartimento di Scienze Fisiche, Universita di Napoli Federico II, Via Cinthia, I-80126 Napoli, Italy Istituto Nazionale di Geofisica e Vukanologia, Sezione di Napoli-Osservatorio Vesuviano, Via Diocleziano, 328,I-80124 Napoli, Italy;

    Istituto Nazionale di Geofisica e Vukanologia, Sezione di Catania, Piazza Roma, 2,195125 Catania, Italy;

    Istituto Nazionale di Geofisica e Vukanologia, Sezione di Pisa, Via delta Faggiola, 32,I-56126 Pisa, Italy;

    Dipartimento di Scienze Fisiche, Universita di Napoli Federico II, Via Cinthia, I-80126 Napoli, Italy Istituto Nazionale di Geofisica e Vukanologia, Sezione di Napoli-Osservatorio Vesuviano, Via Diocleziano, 328,I-80124 Napoli, Italy;

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  • 正文语种 eng
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  • 关键词

    stromboli volcano; petrological monitoring; steady-state system; geochemistry; mineralogy; Sr-Nd isotopes;

    机译：斯特龙博利火山岩石学监测;稳态系统地球化学矿物学;Sr-Nd同位素;

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