Oxygen solubility in Fe-Ni-S alloy at high pressure and implications for the formation and compositions of planetary cores

高压下 Fe-Ni-S 合金中的氧溶解度及其对行星核心形成和成分的影响

• 批准号: 18244188
• 负责人: Professor Dr. Falko Langenhorst
• 金额: --
• 依托单位: Bayerisches Forschungsinstitut für Experimentelle Geochemie und Geophysik (BGI)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2005
• 资助国家: 德国
• 起止时间: 2004-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/18244188?language=en
• 关键词: Oxygen; solubility; Fe; Ni; alloy

The most important fractionation event to affect the geochemistry of the terrestrial planets was their segregation into metallic Fe-rich cores and silicate mantles. Although this process clearly influenced the distribution of siderophile elements between these regions, the conditions under which it took place and the resulting distribution of light elements remain poorly constrained. In the course of this study we aim to develop new models for the geochemical evolution of terrestrial planets during core formation. The solubility of oxygen and sulphur in Fe and Fe-Ni-rich liquid metal will be studied in experiments to pressures of up 25 GPa. Using a thermodynamic model fit to the results of these experiments the geochemical consequences of metal silicate equilibration in realistic magma ocean environments will be explored, partly in collaboration with Prof. U. Hansen/Münster. These models will enable us to understand, for example, whether the core formed progressively as a result of a series of relatively shallow magma oceans during accretion or whether core-mantle equilibration was partly or completely established during melting of the entire mantle.

影响类地行星地球化学最重要的分选事件是它们分离成富铁金属岩心和硅酸盐地幔。虽然这一过程明显影响了这些区域之间亲铁元素的分布，但其发生的条件和由此产生的轻元素分布仍然没有得到很好的限制。在本研究过程中，我们的目标是建立新的地球化学演化模型，为类地行星在岩心形成过程中。在高达25gpa的压力下，研究了氧和硫在富铁和富铁镍液态金属中的溶解度。将利用与这些实验结果相适应的热力学模型，部分与U. Hansen/ m<s:1> nster教授合作，探索现实岩浆海洋环境中金属硅酸盐平衡的地球化学后果。这些模型将使我们能够理解，例如，地核是在吸积过程中一系列相对较浅的岩浆海洋逐渐形成的，还是在整个地幔融化过程中部分或完全建立了核幔平衡。

项目成果

The redox state of the mantle during and just after core formation

• DOI: 10.1098/rsta.2008.0147
• 发表时间: 2008-11-28
• 期刊: PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
• 影响因子: 5
• 作者: Frost, D. J.;Mann, U.;Rubie, D. C.
• 通讯作者: Rubie, D. C.

Partitioning of oxygen between the Earth's mantle and core

• DOI: 10.1029/2009jb006302
• 发表时间: 2010-02-10
• 期刊: JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
• 影响因子: 3.9
• 作者: Frost, Daniel J.;Asahara, Yuki;Sakai, Takeshi
• 通讯作者: Sakai, Takeshi