High Resolution Models of Tectonics and Magmatism at Mid-Ocean Ridges

大洋中脊构造和岩浆作用的高分辨率模型

• 批准号: 0242597
• 负责人: Roger Buck
• 金额: $ 26.09万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-04-01 至 2006-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0242597&HistoricalAwards=false
• 关键词: Resolution; Models; Tectonics; Magmatism; Mid

Present models of mid-ocean ridge spreading processes fail to explain some major features, such as narrow axial highs. This failure stems from not considering magmatic loading of the near axis region and form not focusing on that region with sufficient spatial and temporal resolution in numerical models. New conceptual models for narrow high and axial summit troughs are suggested involving periodic collapse of thin axial lithosphere under the weight of magmatic loads. New model predictions will be tested against data on fault patterns associated with narrow axial highs, the distribution of axial summit troughs, the age distribution of lava flows as a function of shape of the axis, and the degree of rotation of sections of fast-spreading crust seen in tectonic windows.

目前的大洋中脊扩张过程模型无法解释一些主要特征，如狭窄的轴向高压。 这种失败源于没有考虑近轴区域的岩浆加载，以及在数值模型中没有以足够的空间和时间分辨率关注该区域。 新的概念模型，狭窄的高和轴向高峰槽建议涉及定期崩溃薄轴岩石圈的重量下的岩浆负荷。 新模型的预测将根据与狭窄轴向高点相关的断层模式、轴向峰谷的分布、熔岩流的年龄分布（作为轴形状的函数）以及快速扩张地壳部分的旋转程度的数据进行测试。在构造窗口。