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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Transient uprise of gas and gas-rich magma batches fed the pulsating behavior of the 2006 eruptive episodes at Mt. Etna volcano
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Transient uprise of gas and gas-rich magma batches fed the pulsating behavior of the 2006 eruptive episodes at Mt. Etna volcano

机译：天然气和富含天然气的岩浆批次的短暂上升为2006年山火山爆发的脉动行为提供了动力。埃特纳火山

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摘要

Volcanic rock samples were systematically collected during the 2006 eruptive episodes at Mt. Etna. Major and trace elements, together with Sr-Pb isotope ratios, were then obtained on the whole rocks, for different times of emission and vent locations. On the same samples, selected plagioclase crystals were investigated through high-contrast BSE images and core-to-rim compositional profiles for An% and FeO wt.% were obtained. The major element variation through time suggests the involvement of a more basic magma, because MgO/FeO_(tot) and CaO/Al_2O_3 ratios tend to increase from the beginning to the end of the eruption. This more basic magma was characterized by a peculiar geochemical and isotopic signature. This is testified by the negative trend of LREEs, some HFSEs (e.g., Nb, Zr, Y) and lead isotopes, together with increase of some incompatible element ratios (e.g., Rb/La, Zr/Nb) with respect to products erupted before. Concerning the plagioclase crystals, four main texture types were recognized at the core and rim, which indicate either near-equilibrium crystallization or disequilibrium accompanied by strong destabilization. These textures were attributed to: i) crystallization at equilibrium conditions at depth or within the open-conduit (two types of oscillatory zoning), ii) magma decompression at variable ascent rates (coarsely sieve-textures and dissolution at the core), iii) inputs of more basic magma (sieve-textured rims). All the available data, coupled with CO_2/SO_2 molar ratio measured in the gas plume obtained from literature, support the idea that the pulsating regime observed for the volcanic phenomena at the surface during the period July-December 2006 reflects the transient, rapid ascent of several CO_2 bubble fluxes and/or CO_2-rich magma batches from the deep to the shallow levels of the plumbing system. This integrated study has also led to the identification of the replenishment event during the eruption that allowed the ingress of the magma with distinct geochemical/isotopic signature.
机译：在2006年山火山爆发期间系统地收集了火山岩样品。埃特纳火山。然后在整个岩石上获得了主要和微量元素以及Sr-Pb同位素比率，用于不同时间的发射和排放位置。在相同的样品上，通过高对比度的BSE图像对所选斜长石晶体进行了研究，并获得了An％和FeO wt。％的核-边缘组成分布图。随着时间的推移，主要元素的变化表明涉及到更基本的岩浆，因为从喷发开始到结束，MgO / FeO_（tot）和CaO / Al_2O_3的比例趋于增加。这种更基本的岩浆以独特的地球化学和同位素特征为特征。 LREE，某些HFSE（例如Nb，Zr，Y）和铅同位素的消极趋势证明了这一点，并且相对于之前爆发的产品，某些不相容元素比率（例如Rb / La，Zr / Nb）的增加也证明了这一趋势。 。关于斜长石晶体，在核心和边缘识别出四种主要的纹理类型，这表明接近平衡的结晶或不平衡伴随着强烈的去稳定作用。这些质地归因于：i）在平衡条件下在深处或在敞开的导管内结晶（两种类型的振荡分区）； ii）岩浆在不同的上升速率下减压（粗筛结构和岩心溶解），iii）较基本的岩浆（筛纹理轮辋）的输入。所有可用的数据，再加上从文献中获得的气柱中测得的CO_2 / SO_2摩尔比，均支持以下观点：在2006年7月至12月期间，观测到地表火山现象的脉动范围反映了火山岩的瞬时，快速上升。从管道系统的深层到浅层有几个CO_2气泡通量和/或富含CO_2的岩浆批次。这项综合研究还确定了喷发期间的补给事件，该事件使岩浆进入具有独特的地球化学/同位素特征。

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  • 来源
    《Journal of Volcanology and Geothermal Research》 |2012年第15期|p.102-118|共17页
  • 作者

    Eugenio Nicotra; Marco Viccaro;

  • 作者单位

    Universita di Catania, Dipartimento di Scienze Biologiche, Geologiche e Ambientali- Sezione di Scienze delta Terra, Volcanology Research Croup, Corso Italia 57,1-95129 Catania, Italy;

    Universita di Catania, Dipartimento di Scienze Biologiche, Geologiche e Ambientali- Sezione di Scienze delta Terra, Volcanology Research Croup, Corso Italia 57,1-95129 Catania, Italy;

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  • 正文语种 eng
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  • 关键词

    etna; plagioclase; texture; isotope; magma recharge; degassing;

    机译：埃特纳斜长石质地;同位素;岩浆补给脱气;

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