Quantitative Modeling of Infiltration in Layered Intrusions

层状侵入体渗透的定量建模

• 批准号: 9902183
• 负责人: A. Boudreau
• 金额: $ 16.64万
• 依托单位: Duke University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-07-01 至 2003-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9902183&HistoricalAwards=false
• 关键词: Quantitative; Modeling; Infiltration; Layered; Intrusions

9902183BoudreauA major field of inquiry in the earth sciences is the understanding of mechanisms of magma migration and how magma compositions can change as a result of this migration. Areas where this is of importance include the geochemistry of mantle melts and the understanding of how these melts change as they migrate to the surface of the earth. In addition, infiltration and reaction in mafic layered intrusions has been recognized as an important mechanism in changing both the mineralogy and composition of primary magmatic phases. In a number of cases, these features are associate with platinum-group element mineralization; hence, there is considerable economic interest in these problems as well. This study will combine a quantitative model for liquid-mineral equilibria with one-dimensional transport equations to develop a program for modeling magmatic reaction-transport phenomenon. The program is expected to be a useful tool to a broad range of igneous studies. This program will be general enough so users can specify a range of starting compositions (including inhomogeneous host rock compositions). For example, the program will allow calculation of reaction and chromatographic fronts as silicate liquid percolates through a porous solid matrix. In addition to the theoretical modeling, we plan parallel field studies of textural, chemical and mineralogical features of the Bushveld complex, South Africa. These field studies will help to constrain and compare results of the numerical models.

9902183 Boudreau地球科学研究的一个主要领域是了解岩浆迁移的机制以及岩浆成分如何因迁移而发生变化。 这一点很重要的领域包括地幔熔体的地球化学以及了解这些熔体在迁移到地球表面时如何变化。此外，在镁铁质层状侵入体中的渗透和反应已被认为是改变原生岩浆相的矿物学和成分的重要机制。在许多情况下，这些特征与铂族元素矿化有关;因此，对这些问题也有相当大的经济利益。 本研究将联合收割机与流体-矿物平衡的定量模型和一维输运方程相结合，开发一个模拟岩浆反应-输运现象的程序。该程序有望成为一个有用的工具，以广泛的火成岩研究。 该程序将足够通用，因此用户可以指定一系列起始成分（包括不均匀的主岩成分）。 例如，该程序将允许计算硅酸盐液体通过多孔固体基质的反应和色谱前沿。除了理论建模，我们计划平行实地研究的结构，化学和矿物学特征的布什维尔德复杂，南非。这些实地研究将有助于约束和比较数值模型的结果。