The Significance of Metasomatized Continental Lithospheric Mantle in Flood Basalt Formation - Constraints From Mantle Xenoliths Beneath NW Namibia

溢流玄武岩形成中交代化的大陆岩石圈地幔的意义——纳米比亚西北部地幔包体的制约

• 批准号: 9909255
• 负责人: Cornelia Class
• 金额: $ 12万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-01-01 至 2002-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9909255&HistoricalAwards=false
• 关键词: Significance; Metasomatized; Continental; Lithospheric; Mantle

EAR-9909255ClassTwo xenolith suites in NW Namibia provide a unique opportunity to sample directly the continental lithospheric mantle and lower crust in the vicinity of the major Parana-Etendeka continental flood basalt province. One xenolith locality falls within the sphere of influence of the early Tristan plume, whereas the second lies to the south of the plume influence, but within the same crustal unit. Detailed trace element and isotope analyses (Sr, Nd, Pb) on selected samples of these xenolith suites, together with available geochemical data on magmas from the early plume and depleted asthenosphere, will be used to test current models for the actual source regions of continental flood basalts. This project is collaborative endeavor with Dr. Anton le Roex, of the University of Cape Town UCT, South Africa.

纳米比亚西北部的两个捕虏岩套提供了一个独特的机会，可以直接对Parana-Etendeka大陆洪水玄武岩省附近的大陆岩石圈地幔和下地壳进行采样。一个捕虏体位置位于早期特里斯坦地幔柱的影响范围内，而第二个捕虏体位置位于地幔柱影响的南部，但在同一地壳单元内。详细的微量元素和同位素分析（Sr, Nd, Pb）对这些捕虏体套件的选定样本，连同可用的地球化学数据岩浆从早期羽流和枯竭软流圈，将用于测试当前模型的大陆洪水玄武岩的实际来源区域。这个项目是与南非开普敦大学的Anton le Roex博士合作完成的。