地核轻物质的特性、数量和温度
Light matter in the core of the Earth: its identity, quantity and temperature using tricritical phenomena
摘要：
地球富含铁的核心中的轻元素是地球演化的重要指标。它们的数量和分布，以及地核的温度，对于理解地核和地幔如何相互作用以及模拟产生行星磁场的地球发电机是必不可少的。然而，围绕着轻元素的身份和数量存在着长期的争议。在这里，三临界现象的理论是作为一个精确的理论框架来研究在高压和高温下的凝固，实验和数值方法都是复杂的实施，并有很大的不确定性，在他们的结果。将该理论与最可靠的铁熔化数据和初步参考地球模型（PREM）地震资料相结合，获得了实际堆芯熔体中纯铁和铁与轻元素的合金在内核边界（ICB）处的凝固温度。人们还发现轻物质的量约为2.5摩尔%。此外，还求出了固态和液态纯铁在熔化温度下的密度，从而可以得到轻物质的密度，并由此确定其为MgSiO_3。
英文摘要：
Light elements in the iron-rich core of the Earth are important indicators for the evolution of our planet. Their amount and distribution, and the temperature in the core, are essential for understanding how the core and the mantle interact and for modelling the geodynamo which generates the planetary magnetic field. However, there is a longstanding controversy surrounding the identity and quantity of the light elements. Here, the theory of tricritical phenomena is employed as a precise theoretical framework to study solidification at the high pressures and temperatures where both experimental and numerical methods are complicated to implement and have large uncertainties in their results. Combining the theory with the most reliable iron melting data and the Preliminary Reference Earth Model (PREM) seismic data, one obtains the solidification temperature at the inner core boundary (ICB) for both pure iron and for the alloy of iron and light elements in the actual core melt. One also finds a value of about 2.5 mole% for the amount of light matter. In addition, the density of both solid and liquid pure iron at its melting temperature is found. This allows one to obtain the density of the light matter and thus to identify it to be MgSiO3.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
