Collaborative Research: Integrated Petrological, Geophysical, and Numerical Modeling Constraints on Crustal and Mantle Processes along the Galapagos Spreading Center

合作研究：加拉帕戈斯扩张中心沿地壳和地幔过程的综合岩石学、地球物理和数值模拟约束

• 批准号: 0326772
• 负责人: David Graham
• 金额: $ 8.18万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-01-01 至 2006-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0326772&HistoricalAwards=false
• 关键词: Collaborative; Research; Integrated; Petrological; Geophysical

This is a continuation of an integrated, multi-disciplinary project combining seismic, petrologic, geochemical, and numerical modeling. The project focuses on the Galapagos spreading center between 91 and 98 degrees west. The initial work provided the first complete multibeam bathymetry of the axial region, quantified variations in crustal thickness, determined the distribution of seismic reflectors from the top of crustal magma reservoirs, defined along-axis variations in geochemistry, and modeled these variations in terms of mantle source enrichment and extent of partial melting. The objectives of the continuation are to refine models of the relationship between axial thermal structure and axial morphology, combine seismic and petrologic observations to constrain variations in magma reservoir properties, and integrate seismic constraints with new measurement of U-series disequilibria to constrain variations in mantle upwelling rate, temperature and source composition.

这是一个综合的、多学科的项目的延续，该项目结合了地震、岩石学、地球化学和数值模拟。该项目的重点是西经91度至98度的加拉帕戈斯扩散中心。最初的工作提供了第一次完整的轴线区域多波束测深，量化了地壳厚度的变化，确定了地壳岩浆储集层顶部的地震反射器的分布，确定了地球化学沿轴的变化，并根据地幔来源的丰度和部分熔融的程度对这些变化进行了模拟。继续进行的目的是完善轴向热结构和轴向形态之间的关系模型，结合地震和岩石学观测来约束岩浆储集层性质的变化，并将地震约束与U系列不平衡的新测量相结合，以约束地幔上涌速度、温度和源区成分的变化。