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

9628674纳尔逊这个项目是为了改进熔体通过地幔迁移过程中的化学反应模型，这是层析理论的延伸。除了前面的工作人员概述的色谱学原理之外，我们还将考虑根据熔体-地幔反应的程度和类型来改变孔隙度、熔体分数和可变矿物学。为了验证模型预测，我们建议从厚碱性玄武岩序列中获得唯一的数据集。该模型的初步实现表明，至少有三个不同的化学特征可以寻找其碱性玄武岩序列。在以前公布的数据中，这些趋势被归因于地幔交代作用和/或存在微量地幔相，如锆石或金红石。初步评估表明，层析模型可能是解释某些碱性玄武岩趋势的同样可行的替代假说。需要对模型进行更明确的测试，这促使分析程序对夏威夷和加那利群岛上选定的碱性玄武岩喷口进行同位素和微量元素逐流表征。

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.