High Pressure Melting Relations of Model Carbonated Iherzolite in the CaO-MgO-Al2O3-SiO2-CO2 System: The Carbonatite-Kimberlite-Basalt Connection

CaO-MgO-Al2O3-SiO2-CO2 体系中模型碳化二辉橄榄岩的高压熔融关系：碳酸岩-金伯利岩-玄武岩连接

• 批准号: 9725900
• 负责人: Dean Presnall
• 金额: $ 36.18万
• 依托单位: University of Texas at Dallas
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-01-01 至 2002-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9725900&HistoricalAwards=false
• 关键词: Pressure; Melting; Relations; Model; Carbonated

9725900 Presnall Because partial melting processes in the mantle are generally understood to involve a close approach to fractional melting, it is important to obtain data on melt compositions at 2% melting. The low melt fraction limitation of studies on natural lherzolite can be overcome by using linear algebraic methods to extend the classical model system approach to systems of more than four components. This project will use this extended classical approach to study melting relations of model lherzolite in the CaO-MgO-Al2O3-SiO2-CO2 system in 3-5 GPa pressure range. All experiments will be done with a multianvil press and phase compositions will be determined with an electron microprobe. In this system, compositions of liquids produced by large to extremely small (0-2%) degrees of melting of lherzolite can be determined right down to the solidus by direct analysis, so that extrapolations from larger degrees of melting are unnecessary.

9725900 Presnall 由于地幔中的部分熔融过程通常被认为涉及接近分级熔融的过程，因此获得 2% 熔融时熔体成分的数据非常重要。天然二辉橄榄石研究的低熔体分数限制可以通过使用线性代数方法将经典模型系统方法扩展到超过四种组分的系统来克服。该项目将利用这种扩展的经典方法来研究 CaO-MgO-Al2O3-SiO2-CO2 体系中模型二辉橄榄石在 3-5 GPa 压力范围内的熔化关系。 所有实验都将使用多砧压机进行，并使用电子微探针确定相组成。在该系统中，二辉橄榄石从大到极小（0-2%）熔化度产生的液体成分可以通过直接分析确定至固相线，因此不需要从较大熔化度进行推断。