Sampling Basalts in the Quebrada-Discovery-Gofar Transform Fault System: Testing Models of Mantle Flow and Melt Transport

克布拉达-发现-戈法尔转换断层系统中的玄武岩取样：地幔流和熔体输运模型的测试

• 批准号: 0527152
• 负责人: Donald Forsyth
• 金额: $ 57.06万
• 依托单位: Brown University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-01-01 至 2010-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0527152&HistoricalAwards=false
• 关键词: Sampling; Basalts; Quebrada; Discovery; Gofar

0527152ForsythAbstractThe PIs will study and quantify mantle flow, melt production, melt path and mantle heterogeneity beneath the fast spreading EPR at the Quebrada/Discovery/Gofar fracture zone system. They will accomplish this by mapping, sampling intra-transform spreading centers and adjacent mid-ocean ridge spreading centers and post cruise analysis of the basalts for major and trace element, and Sr, Nd, Pb and Th isotopic composition.. The geochemical results will be compared to melting model predictions and the observed geophysics of the region. The study will provide a complete geochemical data set within a coherent geophysical/geodynamics framework that will allow addressing several fundamental questions of mantle and melt dynamics beneath mid-ocean ridges.The award will fund the work of a young investigator and two graduate students. A planned undergraduate student program at sea is another innovative broader educational impact.

PIS将研究和量化在Quebrada/Discovery/Gofar断裂带系统快速扩张的EPR下的地幔流动、熔体产生、熔体路径和地幔的非均质性。他们将通过对转换内扩张中心和邻近的大洋中脊扩张中心进行测绘、取样，并对玄武岩进行主量元素和微量元素以及锶、钕、铅和钍同位素组成的巡航分析来实现这一点。地球化学结果将与熔融模型预测和该地区观测到的地球物理结果进行比较。这项研究将在连贯的地球物理/地球动力学框架内提供完整的地球化学数据集，从而能够解决大洋中脊下地幔和熔体动力学的几个基本问题。该奖项将资助一名年轻的研究人员和两名研究生的工作。计划中的海上本科生项目是另一个创新的、更广泛的教育影响。