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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Silicate glass micro and nanospherules generated in explosive eruptions of ultrabasic magmas: Implications for the origin of pelletal lapilli
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Silicate glass micro and nanospherules generated in explosive eruptions of ultrabasic magmas: Implications for the origin of pelletal lapilli

机译：超基性岩浆爆炸性喷发中产生的硅酸盐玻璃微球和纳米球：对粒状lapilli起源的影响

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摘要

The genesis of spherical ash to lapilli-sized clasts with a central phenocryst or lithic fragment, mantled by a rim of fine-grained juvenile material that includes abundant concentrically arranged prismatic crystals, is interpreted as either: (i) the result of the spinning of a magma bleb with a crystalline kernel in a fluidized system, or (ii) the accretion of small melt droplets to a previously crystallized nucleus in a gas jet. We demonstrate that the rims of pelletal lapilli within tephras of the Cabezo Segura volcano (Calatrava, Spain) are clastic and were formed by the progressive welding of juvenile crystals and silicate glass droplets, and, to a lesser extent, filaments (both melt in origin) around a large crystalline nucleus. Our results support the accretion hypothesis and offer explicit and new images of the melt droplets that were so far considered hypothetical particles. These results indicate also that nanometre-scale juvenile pyroclasts (melt droplets and crystals) can be generated in explosive eruptions of ultrabasic magmas. Those pyroclasts can be subsequently welded together inside a dense gas jet generating pelletal lapilli and ash. (C) 2014 Elsevier B.V. All rights reserved.
机译：球形灰的形成为具有中央隐晶或片状碎屑的小块状碎屑，并由细颗粒少年材料的边缘包裹着，该边缘包括大量同心排列的棱柱形晶体，被解释为：（i）纺丝在流态化系统中具有结晶核的岩浆小泡，或（ii）在气体射流中将小熔滴聚集到先前结晶的核上。我们证明，Cabezo Segura火山（西班牙卡拉特拉瓦）的特非拉斯内的粒状lapilli的边缘是碎屑状的，并且是由幼年晶体和硅酸盐玻璃小滴的渐进焊接形成的，并且在较小程度上是细丝（均起源于熔化） ）在大晶核周围。我们的结果支持了增生假说，并提供了迄今为止被视为假想颗粒的熔滴的显式和新图像。这些结果还表明，可以在超基性岩浆的爆发性喷发中产生纳米级的青少年火山碎裂物（熔滴和晶体）。随后可以在致密的气体喷射流中将这些破火山岩焊接在一起，产生颗粒状的lapilli和灰烬。 （C）2014 Elsevier B.V.保留所有权利。

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