Geodynamic modeling of plume capture and release by a migrating mid-ocean ridge

迁移的洋中脊捕获和释放羽流的地球动力学模型

• 批准号: 1131446
• 负责人: Paul Hall
• 金额: $ 26.14万
• 依托单位: Trustees of Boston University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-09-15 至 2015-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1131446&HistoricalAwards=false
• 关键词: Geodynamic; modeling; plume; capture; release

It has long been hoped that persistent sources of volcanism such as Hawaii and Yellowstone might for a fixed frame of reference, so that the tails of volcanic centers and seamounts they produce might record the motions of tectonic plates that pave the Earth?s surface. However, there is considerable evidence to the contrary. In particular, the Hawaiian hot spot appears to have moved very rapidly southward between 81 and 47 million years ago ? and remained more-or-less fixed latitude thereafter. The perplexing question is why? The answer may have much to say about flow in the Earth?s interior as it related to the motions of its surface plates. One possibility is the plume of material that feeds the volcanism was captured for a time by the East Pacific Rise, a mid-ocean ridge where new seafloor is created. This project will use a combination numerical models and laboratory models to investigate this possibility. In addition to the likely contribution of this work to understanding important large-scale flow processes in the Earth, the comparatively strong broader impacts of this project include support for a junior researcher and a graduate student, laboratory experiments that provide an excellent opportunity reveal the underlying physics and are ideal for the proposed undergraduate involvement, and videos from the models that will be shared on line; the SERC site is a good place for making these materials available to the broader community.

长期以来，人们一直希望，像夏威夷和黄石公园这样的火山活动的持续来源可能会成为一个固定的参照系，这样火山中心的尾部和它们产生的海山可能会记录下铺设地球的构造板块的运动。s表面。然而，有相当多的证据表明情况恰恰相反。特别是，夏威夷的热点似乎在8100万到4700万年前迅速向南移动。此后，或多或少地保持了固定的纬度。令人困惑的问题是为什么？答案可能有很多关于地球流动的说法？因为它与其表面板块的运动有关。一种可能性是供给火山活动的物质柱被东太平洋隆起捕获了一段时间，这是一个新的海底形成的洋中脊。该项目将使用数值模型和实验室模型相结合来研究这种可能性。除了这项工作可能有助于了解地球上重要的大规模流动过程之外，该项目的较强的广泛影响包括：支持一名初级研究员和一名研究生;实验室实验提供了一个极好的机会，揭示了基本的物理学，是拟议的大学生参与的理想选择;以及将在网上分享的模型视频; SERC网站是向更广泛的社区提供这些材料的好地方。