E3 Soc. Coop. Startup UNICAL-Arcavacata di Rende, Cosenza, Italy.
DiBEST, University of Calabria, Arcavacata di Rende, Cosenza, Italy.
Sci Rep. 2019 Feb 8;9(1):1711. doi: 10.1038/s41598-018-37983-9.
In this work the morphologic features of Pele's hair formed during three different eruptions of Kilauea volcano have been investigated: fountaining from Kilauea Iki's 1959 Episode 1, weak explosive activity from Halemaumau lava lake and littoral explosions at Waikupanaha (2009). Morphological studies were performed by optical, stereo- and scanning electron microscopy. For the first time 3D image analysis was carried out by synchrotron radiation X-ray computed microtomography, which allowed a high-resolution 3D reconstruction of the internal structure of each Pele's hair, highlighting several differences in terms of number density, elongation and shape of the vesicles between the samples from the three eruptions. We identified three main parameters determining these differences: initial size of the magma droplet, ejection velocity and magma viscosity. Pele's hair erupted during the Kilauea Iki's fountaining shows the highest thickness and the least elongated shape of the vesicles, though it is related to fast ejection of a low viscosity magma. We therefore suggest that the size of magma droplets is the main parameter influencing the morphology and inner textures of the Pele's hair. The comparison with Pele's hair of similar eruptions elsewhere demonstrates that there is no univocal correspondence between eruptive style and Pele's hair texture.
在这项工作中，研究了基拉韦厄火山三次不同喷发期间形成的 pele 头发的形态特征：1959 年基拉韦厄伊基 1 号喷发的喷泉、哈雷茂茂熔岩湖的弱爆炸活动和怀库潘纳哈的沿海爆炸（2009 年）。形态学研究通过光学、立体和扫描电子显微镜进行。首次通过同步辐射 X 射线计算机断层扫描进行了 3D 图像分析，该分析允许对每个 pele 头发的内部结构进行高分辨率的 3D 重建，突出了三个喷发样品之间在囊泡的数量密度、伸长率和形状方面的几个差异。我们确定了决定这些差异的三个主要参数：岩浆液滴的初始大小、喷射速度和岩浆粘度。在基拉韦厄伊基喷泉喷发期间喷发的 pele 头发显示出最高的厚度和最小的囊泡伸长形状，尽管这与低粘度岩浆的快速喷射有关。因此，我们认为岩浆液滴的大小是影响 pele 头发形态和内部结构的主要参数。与其他地方类似喷发的 pele 头发的比较表明，喷发方式和 pele 头发纹理之间没有明确的对应关系。
