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Ash Sintering in the Presence of a CO2-H2O Vapor

机译:在CO2-H2O蒸气存在下的灰烬烧结

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摘要

We carried out rhyolite ash sintering experiments in the presence of a mixed CO2-H2O vapor using both fine and coarse ash. Fine ash is barely sintered after 7 minutes and fully densified after about 30 minutes. Coarse ash is barely sintered after 45 minutes and fully densified after a few hours. Vesicle relaxation from initially angular shapes to spherical shapes takes longer than estimated from scaling relations. The experimental sintering and vesicle relaxation timescales substantiate the hypothesis that natural obsidian pyroclasts from Mono Craters, California (USA) form by ash sintering. Two observations are interpreted as the most direct evidence yet that CO2 flushing from a deeper magmatic was involved in the eruption: (1) the preservation of sharp-tipped vesicles in domains of clasts that have high dissolved CO2 concentrations, and (2) the anticorrelation between H2O and CO2 observed in multiple clasts.;This thesis includes previously unpublished co-authored material.
机译:我们在混合CO2-H2O蒸气存在下使用细灰和粗灰进行流纹岩灰烧结实验。 7分钟后几乎未烧结细灰,约30分钟后完全致密。粗灰在45分钟后几乎未烧结,几小时后完全致密。从最初的角形到球形的囊泡松弛所花费的时间比根据比例关系所估计的要长。实验性烧结和囊泡弛豫时间尺度证实了以下假设:灰烬烧结形成了来自加利福尼亚州(美国)莫诺火山口的天然黑曜石火山碎屑。有两个观察结果被解释为最直接的证据,表明更深的岩浆中的CO2冲刷与喷发有关:(1)在溶解的CO2浓度高的岩屑区域保留了尖锐的囊泡,以及(2)反相关在多个方面观察到H2O和CO2之间的关系。;本文包括以前未发表的合著材料。

著录项

  • 作者

    Hoxsie, Erin Colleen.;

  • 作者单位

    University of Oregon.;

  • 授予单位 University of Oregon.;
  • 学科 Geology.;Geochemistry.
  • 学位 M.S.
  • 年度 2018
  • 页码 39 p.
  • 总页数 39
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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