Experimental Studies of Physical Properties in the Fe-Si-S System at Planetary Core P, T Conditions

行星核心P、T条件下Fe-Si-S体系物理性质的实验研究

• 批准号: RGPIN-2022-04427
• 负责人: Yong, Wenjun
• 金额: $ 1.89万
• 依托单位: University of Western Ontario
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=751194
• 关键词: Experimental; Studies; Physical; Properties; Fe

Many important surface features of planets such as the magnetic field and plate tectonics are closely related to the physical and chemical processes happening inside the deep interior of a planet. Unfortunately, for most planets and planetary bodies, their deep interiors are forbidden regions for direct access and alternative approaches are needed. In this proposed research, simultaneous high pressure (up to 25 GPa) and high temperature (up to 2500 K) experiments will be conducted in our large volume presses to mimic the extreme conditions of the interior of terrestrial planets and some differentiated satellites in our solar system. The themes of Dr. Yong's research proposal will focus on the metallic cores of these planetary bodies, which consist primarily of iron, with a small amount of lighter elements such as silicon, sulfur as alloy constituents. The melting behavior and liquid density of iron-rich alloys have significant implications to many geophysical and planetary phenomena, including core composition, thermal structure, heat flow, magnetic field generation, and inner core solidification scenarios. A systematic experimental study of the high pressure melting boundary and liquid density of the Fe-Si and Fe-S systems will be carried out using our state of the art large volume presses, which include the largest capacity (3000 ton) multi-anvil press in North America, and analytical instruments at Western University. The proposed studies will answer questions that are key to understanding the deep interior of planets by providing the geophysical and planetary science community the critically needed data on two essential physical properties on liquid iron alloys at pressures up to 25 GPa. For certain chemical compositions and pressures, such data will be the first of its kind. These data will reveal additional insight into important questions related to the chemical and physical state, dynamics and processes occurring in the interiors of Earth and other terrestrial-type planetary bodies such as Moon, Mercury, Mars, Ganymede and Io (e.g. What light elements are present, and at what concentration, in the core? Is there a solid inner core and, if so at what depth and when did it start to crystallize? Are density differences between pure Fe and Fe alloy liquids large enough to power chemical convection in a liquid outer core?). Four HQP will receive extensive training in high pressure and high temperature experimental mineral physics that will provide transferable skills to prepare them for employment in academia, government and industry.

行星（例如磁场和板块构造）等许多重要的表面特征与行星深内部内部发生的物理和化学过程密切相关。不幸的是，对于大多数行星和行星体而言，它们的深度内饰是禁止直接进入的区域，需要采取替代方法。在这项拟议的研究中，将在我们的大容量压力下同时进行高压（最多25 GPA）和高温（最高2500 K）实验，以模仿我们的太阳系中陆地行星内部的极端条件和一些分化的卫星。 Yong博士的研究提案的主题将集中在这些行星体的金属岩心上，主要由铁组成，其中包括少量较轻的元素，例如硅，硫作为合金成分。铁富合金的熔化行为和液体密度对许多地球物理和行星现象具有显着影响，包括核心组成，热结构，热流，磁场产生和内部核心固化场景。将使用我们的最佳状态大量出版社对Fe-SI和Fe-S系统的高压熔化边界和液体密度进行系统的实验研究，其中包括北美最大的容量（3000吨）多动力媒体出版社，以及西部大学的分析工具。拟议的研究将通过为地球物理和行星科学界提供对地球内部深度内部的关键问题回答，这是对液态铁合金的两种基本物理特性的迫切需要数据，最高为25 GPA。对于某些化学组成和压力，此类数据将是同类数据中的第一个。这些数据将揭示对与化学和物理状态，动态和过程有关的重要问题的更多见解合金液体足够大，可以在液体外芯中为化学对流提供动力吗？）。四个HQP将接受高压和高温实验性矿物质物理学的广泛培训，这些矿物质物理学将提供可转移的技能，以准备在学术界，政府和工业中就业。