In Situ Density Measurements of Molten Minerals at High Pressures and Temperatures

熔融矿物的性质对于了解地球内部的结构和动力学变得越来越重要，作为晶体矿物的研究也越来越广泛。这项提议将利用同步辐射光束线的新实验能力来研究熔融矿物，并在社区拥有的设施中探索新的可能性。拟开展的研究工作包括：1)高压高温下测量Fe-FeS系熔体密度；2)高压下观察Fe和H合金化，测量Fe-H熔体密度。3)探索熔融硅酸盐密度测量的真实性。该项目将使用多压头压力机来产生压力和温度，并使用单色X射线照相和X射线吸收模拟来测量高压下的熔体密度。铁合金系统的密度测量结果将为了解地球核心的组成提供必要的信息，并为未来DAC熔体密度测量的发展提供可靠的数据，以将压力范围提高到核心条件。本项目所研究的材料并不局限于岩心矿物。这项研究还将包括探索测量富铁硅酸盐熔体的可能性。随着研究的进行，合作和技术开发将纳入该项目。作为这一项目的结果，在同步加速器x射线光束线上开发的所有新的实验能力将向社区开放进行科学研究。

The properties of molten minerals become more and more important forunderstanding the structure and dynamics of the Earth's interior, ascrystalline minerals have been much more extensively studied. This proposalwill take the advantage of new experimental capabilities at synchrotronbeamlines to study molten minerals, and to explore new possibilities at thecommunity owned facilities. The proposed research activities include: 1)Measuring the density of molten Fe-FeS system at high pressures andtemperatures 2) Observing Fe and H alloying at high pressure and measuringdensity of Fe-H melt. 3) Exploring the reality of density measurements ofmolten silicates. The project will use a multi-anvil press for pressure andtemperature generation, and monochromatic x-ray radiography and x-rayabsorption simulation for melt density measurements at high pressures.Results of density measurements on the iron alloy system will provide essentialinformation for understanding Earth's core composition and robust data forfuture DAC melt density measurement development to advance the pressurerange up to core conditions. The materials to be studied in this project arenot limited to core minerals. This research will also include exploring the possibility of measuring iron-rich silicate melts. Collaborations and technical developments will bebrought into the project as the research proceeds. All of the newexperimental capabilities developed at synchrotron x-ray beamlines as aresult of this project will be open to the community for scientificresearch.