Isotopic and Chemical Investigation of Chromatographic Effects During Melt-Mantle Interaction

熔体-地幔相互作用过程中色谱效应的同位素和化学研究

• 批准号: 9628674
• 负责人: Bruce Nelson
• 金额: $ 10.75万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-09-01 至 2000-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9628674&HistoricalAwards=false
• 关键词: Isotopic; Chemical; Investigation; Chromatographic; Effects

9628674 Nelson This project is to refine models of chemical reactions during melt migration through the mantle sing an extension of chromatographic theory. In addition to the chromatographic principles outlined by previous workers, we will include consideration of changing porosity, melt fraction and variable mineralogy as a function of extent and type of melt-mantle reaction. To test the model predictions, we propose to obtain a unique data set from thick alkalic basalt sequences. Initial implementation of this model suggests at lease three distinct chemical characteristics to search for its alkalic basalt sequences. In published data, previously, these trends have been ascribed to mantle metasomatism and/or presence of trace mantle phases such as zircon or rutile. Preliminary evaluation suggests that the chromatographic model may be an equally viable alternative hypothesis to explain certain alkalic basalt trends. The need for a more definitive test of the model motivates an analytical program to obtain isotopic and trace element flow-by-flow characterization of selected alkalic basalt vents on Hawaiian and Canary Islands.

9628674纳尔逊这个项目是完善的化学反应模型熔体迁移通过地幔唱色谱理论的扩展。 除了以前的工作者概述的色谱原理，我们将包括考虑变化的孔隙度，熔体分数和变量矿物学作为熔体地幔反应的程度和类型的函数。 为了测试模型的预测，我们建议从厚碱性玄武岩序列获得一个独特的数据集。 该模型的初步实施表明，至少有三个不同的化学特征，以寻找其碱性玄武岩序列。 在已发表的数据中，以前，这些趋势被归因于地幔交代作用和/或微量地幔相（如锆石或金红石）的存在。 初步评估表明，色谱模型可能是一个同样可行的替代假设，以解释某些碱性玄武岩的趋势。 需要一个更明确的测试模型的动机分析程序，以获得同位素和微量元素的流动特性的选择碱性玄武岩喷口夏威夷和加那利群岛。