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The plumbing systems and parental magma compositions of shield volcanoes in the central Oregon High Cascades as inferred from melt inclusion data.

机译:根据熔体包裹体数据推断,俄勒冈中部高瀑布中的盾构火山的管道系统和母岩浆成分。

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摘要

Long-lived and short-lived volcanic vents often form in close proximity to one another. However, the processes that distinguish between these volcano types remain unknown. Here, I investigate the differences of long-lived (shield volcano) and short-lived (cinder cone) magmatic systems using two approaches. In the first, I use melt inclusion volatile contents for shield volcanoes and compare them to published data for cinder cones to investigate how shallow magma storage conditions differ between the two vent types in the Oregon Cascades. In the second, I model the primitive magmas that fed shield volcanoes and compare these compositions to those of nearby cinder cones to determine if the volcanoes are drawing magma from the same sources.;The volatile concentrations suggest that long-lived and short-lived magmatic plumbing systems are distinct. Modeling of parental magmas and differentiation processes further suggest that long-lived and short-lived volcanoes have erupted lava from the same mantle magma source.
机译:长寿命和短寿命的火山喷口经常彼此靠近形成。但是,区分这些火山类型的过程仍然未知。在这里,我使用两种方法研究了长寿命(盾形火山)和短寿命(煤渣锥)岩浆系统的差异。首先,我将盾构火山的熔体夹杂物挥发成分与已发布的煤渣锥数据进行了比较,以研究俄勒冈喀斯喀特火山的两种出口类型之间的浅层岩浆储存条件有何不同。在第二个模型中,我对馈入盾构火山的原始岩浆进行了建模,并将这些成分与附近的煤渣锥的成分进行比较,以确定火山是否从相同的来源汲取了岩浆;挥发性浓度表明,长寿和短寿的岩浆管道系统是不同的。父母岩浆和分化过程的模型进一步表明,长寿和短寿火山已经从同一地幔岩浆源喷发了熔岩。

著录项

  • 作者单位

    University of Oregon.;

  • 授予单位 University of Oregon.;
  • 学科 Geology.;Geochemistry.;Petrology.
  • 学位 M.S.
  • 年度 2012
  • 页码 136 p.
  • 总页数 136
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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