Collaborative Research: Constraining Mantle Flow, Melt Supply, and Lower Crustal Structure Between the Clipperton and Siqueiros Fracture Zones from a Seismic Undershoot Experiment

合作研究：通过地震下冲实验约束克利珀顿和西凯罗斯断裂带之间的地幔流动、熔体供应和下地壳结构

• 批准号: 0118597
• 负责人: Douglas Toomey
• 金额: $ 8.9万
• 依托单位: University of Oregon Eugene
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-10-15 至 2005-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0118597&HistoricalAwards=false
• 关键词: Collaborative; Research; Constraining; Mantle; Flow

A long-standing controversy in mid-ocean ridge dynamics is whether upwelling beneath fast spreading ridges is sheet-like with a relatively uniform magma supply along axis, or more three-dimensional with diapiric-like upwelling near segment centers and lateral redistribution of melt along axis at shallow magma chamber levels and/or by lower crustal, ductile flow. The UNDERSHOOT experiment was designed to address this problem by mapping the pattern of magma delivery from the mantle to the crust along the entire length of a transform bounded segment of the East Pacific Rise between the Siqueiros and Clipperton fracture zones. The quality of the data are the important issues that remain warrant further analyses. Models of crustal thickness will be refined by employing improved algorithms that allow all data collected in the experiment to be modeled simultaneously. Understanding of the properties of the Moho transition and uppermost mantle will be improved. Improved models of along axis variations in the structure of the mantle and lower crust low velocity zones will be developed.

中域中山脊动力学的长期争议是，在快速扩散的山脊下方上升是像片状的，沿轴沿着轴的岩浆供应相对均匀，或者是更多的三维山脊，或者在浅层岩浆室内和/或下层造成的，沿轴的融化中，沿轴心沿轴的融化和沿轴的外侧重新分布。 通过绘制岩浆递送的模式从地幔到地壳的整个长度，沿着Siqueiros和Clipperton裂缝区域之间的东太平洋上升的整个长度绘制岩浆递送的模式，旨在解决这个问题。 数据的质量是仍然需要进一步分析的重要问题。 地壳厚度模型将通过采用改进的算法来完善，这些算法允许同时对实验中收集的所有数据进行建模。 了解Moho过渡和最高地幔的性质的理解将得到改善。 将开发地幔结构和下地壳低速区域结构的沿轴变化的改进模型。