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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Textural studies of vesicles in volcanic rocks: An integrated methodology
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Textural studies of vesicles in volcanic rocks: An integrated methodology

机译：火山岩中囊泡的质地研究：综合方法

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摘要

Vesicles in volcanic rocks are frozen records of degassing processes in magmas. For this reason, their sizes, spatial arrangements, numbers and shapes can be linked to physical processes that drive magma ascent and eruption. Although numerous techniques have been derived to describe vesicle textures, there is no standard approach for collecting, analyzing, and interpreting vesicular samples. Here we describe a methodology for techniques that encompass the entire data acquisition process, from sample collection to quantitative analysis of vesicle size and number. Carefully chosen samples from the lower, mean and higher density/ vesicularity endmembers are characterized using image nesting strategies. We show that the texture of even microvesicular samples can be fully described using less than 20 images acquired at several magnifications to cover efficiently the range of existing vesicle sizes. A new program (FOAMS) was designed to perform the quantification stage, from vesicle measurement to distribution plots. Altogether, this approach allows substantial reduction of image acquisition and processing time, while preserving enough user control to ensure the validity of obtained results. We present three cameo investigations - on basaltic lava flows, scoria deposits and pumice layers - to show that this methodology can be used to quantify a wide range of vesicle textures, which preserve information on a wide range of eruptive conditions.
机译：火山岩中的囊泡是岩浆中脱气过程的冻结记录。因此，它们的大小，空间排列，数量和形状可以与驱动岩浆上升和喷发的物理过程联系起来。尽管已经获得了许多描述囊泡纹理的技术，但是还没有用于收集，分析和解释囊泡样品的标准方法。在这里，我们描述了一种涵盖整个数据采集过程的技术方法，从样品收集到囊泡大小和数量的定量分析。使用图像嵌套策略表征从较低，平均和较高密度/囊泡末端成员中精心选择的样本。我们显示，即使使用微放大倍数采集不到20张图像也能充分描述甚至微囊样品的质地，以有效覆盖现有囊泡大小的范围。设计了一个新程序（FOAMS），以执行从囊泡测量到分布图的量化阶段。总之，这种方法可以大大减少图像采集和处理时间，同时保留足够的用户控制权，以确保所获得结果的有效性。我们介绍了三个浮雕研究-对玄武岩熔岩流，火山灰沉积物和浮石层-表明该方法可用于量化各种囊泡质地，从而保留了各种喷发条件下的信息。

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