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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Micro-porous pyroclasts reflecting multi-vent basaltic-andesite Plinian eruptions at Mt. Tongariro, New Zealand
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Micro-porous pyroclasts reflecting multi-vent basaltic-andesite Plinian eruptions at Mt. Tongariro, New Zealand

机译：微多孔发球式反射MT的多孔玄武岩 - 安德莱斯爆发。 Tongariro，新西兰

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摘要

Mt. Tongariro is a multi-vent volcanic complex in the central North Island of New Zealand, constructed along the axis of an active graben. Its five largest-known explosive eruption episodes occurred 11,000 years ago during a similar to 200 year-long paroxysm. During these, stable Plinian and collapsing sub-Plinian columns erupted from multiple sequential and synchronous vents along the graben axis. We examined the spatially varying eruption dynamics during the 200-year paroxysm through the lens of pyroclastic textures. Each eruption episode produced micro-vesicular basaltic-andesitic juvenile lapilli with high vesicle number densities and high groundmass crystallinity. Textural characteristics indicate that pressurisation via second boiling drove eruptions and rhyolite-like melt viscosities promoted brittle failure. Highly variable and mingled textures within individual juvenile lapilli evidence diverse conditions developed across the conduit during the eruption. Foamy magma rose rapidly through the conduit core, driving explosive vigour, and dragged and sheared gas-poor crystallised magma from the conduit margins. Consistent with the northward-widening graben, the most stable Plinian eruptions occurred at northern vents, under highest extensional stresses and possibly widest most stable conduits. By contrast, collapsing, unstable eruption columns occurred at southern vents, where mainly degassed and crystalline magma erupted at lower ejection rates through narrower, unstable and shifting conduits. These data collectively show how spatial variations in structure and tectonics may strongly influence explosive eruption style. (C) 2020 Elsevier B.V. All rights reserved.
机译：公吨。 Tongariro是新西兰中部北岛的多孔火山复合体，沿着活跃的Graben轴建造。它在类似于200年长的阵发度的情况下，它的五个最大的爆炸性爆发剧集发生了11,000年前。在这些，稳定的Plinian和折叠的亚普林柱沿着Grabben轴从多个顺序和同步通风口爆发。我们通过Pyroclastic纹理镜片在200年阵发期间检查了空间不同的喷发动力学。每个喷发剧集产生微囊状玄武岩 - 安塞蒂氏菌，具有高囊泡数密度和高基质结晶度。纹理特征表明，通过第二沸腾驱动喷雾喷雾和细流石样熔体粘度的加压促进了脆性衰竭。在爆发期间，各个少年LAPILLI中的个体少年LAPILLI证据证明在爆发期间在导管中产生的多样化纹理。泡沫岩浆通过导管芯快速上升，驾驶爆炸性活力，以及从导管边缘拖动和剪切的气体较差的岩浆。符合北方的Graben，最稳定的Plinian爆发发生在北风最高的压力下，并且可能最宽的导管。相比之下，坍塌，不稳定的喷发柱发生在南风通风口，其中主要通过较窄，不稳定和移动导管以较低的喷射率脱气和晶体岩浆。这些数据集体展示了结构和构造的空间变化如何强烈影响爆炸性的喷发风格。 （c）2020 Elsevier B.v.保留所有权利。

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  • 来源
    《Journal of Volcanology and Geothermal Research》 |2020年第1期|106936.1-106936.18|共18页
  • 作者

    Heinrich Mirja; Cronin Shane J.; Torres-Orozco Rafael; Colombier Mathieu; Scheu Bettina; Pardo Natalia;

  • 作者单位

    Univ Auckland Sch Environm Private Bag 92019 Auckland 1010 New Zealand;

    Univ Auckland Sch Environm Private Bag 92019 Auckland 1010 New Zealand;

    UCL Dept Mech Engn Torrington Pl London WC1E 7JE England|Univ Nacl Autonoma Mexico Ctr Geosci Campus Juriquilla Blvd Juriquilla 3001 Queretaro 76230 Mexico;

    Ludwig Maximilian Univ Munich Dept Geo & Environm Sci Theresienstr 41 D-80333 Munich Germany;

    Ludwig Maximilian Univ Munich Dept Geo & Environm Sci Theresienstr 41 D-80333 Munich Germany;

    Univ Los Andes Dept Geosci Cr 1 18A-12 Bogota Colombia;

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