首页> 外文学位 >Testing competing caldera models using uranium-lead geochronology; intrusive history of the Questa caldera: Latir volcanic field, New Mexico, USA.
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Testing competing caldera models using uranium-lead geochronology; intrusive history of the Questa caldera: Latir volcanic field, New Mexico, USA.

机译:使用铀铅地球年代学测试竞争的破火山口模型; Questa破火山口的侵入历史:拉特尔火山田,美国新墨西哥州。

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摘要

A compelling new model for caldera evolution challenges the standard depiction of large-scale volcanism. Here, I test these competing models by establishing the temporal and chemical relationship between ignimbrite and potential cogenetic plutons related to the Questa caldera, Latir volcanic field, New Mexico.;Results from zircon U/Pb geochronology indicate that the majority of intrusive rocks formed after ignimbrite eruption. The Rio Hondo pluton was assembled over a minimum of 500 k.y., and crystallization progressed from the structurally highest levels downward, consistent with top-down incremental assembly of the pluton. Trace-element modeling demonstrates that the plutonic rocks are not the residua of crystal fractionation, and the predicted systematic difference in trace-element chemistries of plutonic and volcanic rocks is not observed. Finally, the data presented here mostly support the new model for caldera evolution and is broadly inconsistent with the standard caldera model.
机译:一个令人信服的火山口进化新模型,对大规模火山活动的标准描述提出了挑战。在这里,我通过建立与新墨西哥州拉蒂尔火山场Questa破火山口相关的火成岩和潜在的同成岩体之间的时间和化学关系,来测试这些竞争模型;锆石U / Pb年代学的结果表明,大多数侵入岩形成于火成岩喷发。力拓本多(Rio Hondo)岩体的组装时间至少为500 k.y.,并且结晶从结构上的最高水平向下发展,这与岩体的自顶向下增量组装一致。痕量元素建模表明,深成岩不是晶体分离的残余物,并且未发现深成岩和火山岩中微量元素化学成分的预测系统差异。最后,此处提供的数据主要支持破火山口进化的新模型,并且与标准破火山口模型广泛不一致。

著录项

  • 作者

    Tappa, Michael J.;

  • 作者单位

    The University of North Carolina at Chapel Hill.;

  • 授予单位 The University of North Carolina at Chapel Hill.;
  • 学科 Geochemistry.
  • 学位 M.S.
  • 年度 2009
  • 页码 60 p.
  • 总页数 60
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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