Metal-Silicate Partitioning of Si, O, and Mg at High Pressures and High Temperatures: Implications to the Compositional Evolution of Core-Forming Metallic Melts

IF 2.9 2区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Chang Pu, Xiujin Gao, Zhengyang Wu, Zhixue Du, Zhicheng Jing
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Abstract

High-pressure and high-temperature experiments were conducted to investigate the partitioning behaviors of Si, O, and Mg between molten Fe-alloys and silicate melts in the Fe-Si-O-Mg system under conditions of 2–72 GPa and 2000–5500 K, using both laser-heated diamond anvil cells and a multi-anvil press. Combing our new experimental results with previously published data, we evaluated the effects of pressure, temperature, and metallic compositions on the partitioning behaviors of Si, O, and Mg. A set of internally consistent interaction parameters between Si, O, and Mg were obtained by the simultaneous fitting of distribution coefficients for all three elements in the Fe-Si-O-Mg system. The composition-dependent distribution coefficients were applied in calculating the compositional evolution of metallic melts during multi-stage core formation. Our results suggest that the core-forming metallic melts would contain more Si and O than previously estimated due to the attractive interactions of light elements in the metal. Compared to the geophysically constrained core composition, these findings imply the exsolution of light elements, likely in the form of SiO2, from the outer core upon cooling.

Abstract Image

高压高温下Si, O和Mg的金属-硅酸盐配分:对成核金属熔体组成演化的影响
利用激光加热的金刚石顶砧细胞和多顶砧压力机,在2-72 GPa和2000-5500 K条件下,对Fe-Si-O-Mg体系中Si、O和Mg在Fe-Si-O-Mg体系中与硅酸盐熔体之间的分配行为进行了高压和高温实验研究。结合我们的新实验结果和先前发表的数据,我们评估了压力、温度和金属成分对Si、O和Mg的分配行为的影响。通过同时拟合Fe-Si-O-Mg体系中三种元素的分布系数,得到了Si、O和Mg之间一组内部一致的相互作用参数。应用成分相关分布系数计算了多阶段岩心形成过程中金属熔体的成分演变。我们的结果表明,由于金属中轻元素的吸引相互作用,形成核心的金属熔体中含有比先前估计的更多的Si和O。与地球物理上受限制的地核组成相比,这些发现暗示了在冷却时,可能以SiO2形式从外核析出的轻元素。
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来源期刊
Geochemistry Geophysics Geosystems
Geochemistry Geophysics Geosystems 地学-地球化学与地球物理
CiteScore
5.90
自引率
11.40%
发文量
252
审稿时长
1 months
期刊介绍: Geochemistry, Geophysics, Geosystems (G3) publishes research papers on Earth and planetary processes with a focus on understanding the Earth as a system. Observational, experimental, and theoretical investigations of the solid Earth, hydrosphere, atmosphere, biosphere, and solar system at all spatial and temporal scales are welcome. Articles should be of broad interest, and interdisciplinary approaches are encouraged. Areas of interest for this peer-reviewed journal include, but are not limited to: The physics and chemistry of the Earth, including its structure, composition, physical properties, dynamics, and evolution Principles and applications of geochemical proxies to studies of Earth history The physical properties, composition, and temporal evolution of the Earth''s major reservoirs and the coupling between them The dynamics of geochemical and biogeochemical cycles at all spatial and temporal scales Physical and cosmochemical constraints on the composition, origin, and evolution of the Earth and other terrestrial planets The chemistry and physics of solar system materials that are relevant to the formation, evolution, and current state of the Earth and the planets Advances in modeling, observation, and experimentation that are of widespread interest in the geosciences.
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