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.

位于纳米比亚西北部的 EAR-9909255ClassTwo 捕虏体套件提供了直接对主要巴拉那-埃滕德卡大陆溢流玄武岩省附近的大陆岩石圈地幔和下地壳进行采样的独特机会。其中一个捕虏体地点位于早期特里斯坦羽流的影响范围内，而第二个则位于羽流影响的南部，但位于同一地壳单元内。对这些捕虏体套件的选定样本进行详细的痕量元素和同位素分析（Sr、Nd、Pb），以及早期岩浆和贫化软流圈岩浆的现有地球化学数据，将用于测试大陆实际源区的当前模型。洪水玄武岩。该项目是与南非开普敦 UCT 大学 Anton le Roex 博士的合作项目。