The effect of network-formers (Si, Ti, Al and P) on ferric/ferrous ratio in silicate melts: experimental study and improvement of existing models.

网络形成体（Si、Ti、Al 和 P）对硅酸盐熔体中铁/亚铁比率的影响：实验研究和现有模型的改进。

• 批准号: 233220105
• 负责人: Professor Dr. Francois Holtz, Ph.D.
• 金额: --
• 依托单位: Institut für Mineralogie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/233220105?language=en
• 关键词: effect; network; formers; Si; Ti

Geochemical processes occurring in magmatic systems depend strongly on oxygen fugacity and on the Fe3+/Fe2+ ratio in silicate melts. This ratio can be theoretically predicted using available thermodynamic models. The available thermodynamic models take compositional parameters into account, but mainly for network modifying cations (Ca, Mg, Na, K). There are few systematic studies allowing us to take the effects of network forming cations into account (Si, Al, Ti, P). In this project, the effect of Al on the Fe3+/Fe2+ ratio in silicate melts will be investigated experimentally at 1 bar. The results will be combined with recent previous datasets on the effects of Si, P und Ti on the Fe3+/Fe2+ ratio in silicate melts to provide a consistent thermodynamic model predicting accurately the effect of melt composition, in particular SiO2, Al2O3, TiO2 and P2O5, on the Fe3+/Fe2+ ratio of mafic melts. The results are of importance for mafic melts generated in the Earth and for their differentiation products (silicic melts) but also for the interpretation of the formation and evolution of basalts from the Moon or other planetary systems, which differ from Earth basalts by their Al/Si ratio.

岩浆系统中发生的地球化学过程在很大程度上取决于氧气散热性和硅酸盐熔体中的Fe3+/Fe2+比。理论上可以使用可用的热力学模型来预测该比率。可用的热力学模型考虑了组成参数，但主要用于网络修改阳离子（CA，MG，NA，K）。很少有系统的研究使我们考虑到网络形成阳离子的影响（SI，AL，TI，P）。在该项目中，将在1 Bar上实验研究AL对硅酸盐熔体中Fe3+/Fe2+比率的影响。结果将与最新的数据集结合使用SI，P和Ti对硅酸盐融化中Fe3+/Fe2+比的影响，以提供一致的热力学模型，以准确预测熔体组成的效果，尤其是SiO2，Al2O3，TiO2，TiO2，TiO2和P2O5对Fe3+/fe2+/fe2+/fe2+ fe2+ rafio of mafic mafic mafic maffio of Mafic Melelts的效果。结果对于地球及其分化产物（硅质熔体）的镁铁质熔体至关重要，也对玄武岩从月球或其他行星系统的形成和演变的解释也很重要，这与地球玄武岩不同。

项目成果

Effects of melt composition on Fe3+/Fe2+ in silicate melts: a step to model ferric/ferrous ratio in multicomponent systems

熔体成分对硅酸盐熔体中 Fe3 /Fe2 的影响：模拟多组分系统中铁/亚铁比率的步骤

• DOI: 10.1007/s00410-015-1119-6
• 发表时间: 2015
• 期刊: Contributions to Mineralogy and Petrology
• 影响因子: 3.5
• 作者: Borisov A;Behrens H;Holtz F.
• 通讯作者: Holtz F.

The effect of titanium and phosphorus on ferric/ferrous ratio in silicate melts: an experimental study

• DOI: 10.1007/s00410-013-0943-9
• 发表时间: 2013-12-01
• 期刊: CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
• 影响因子: 3.5
• 作者: Borisov, Alexander;Behrens, Harald;Holtz, Francois
• 通讯作者: Holtz, Francois