Condensation and fractionation in the protoplanetary disk: the enstatite meteorite perspective

顽火辉石陨石是一组独特的岩石，其成分范围从原始（未改变）到加工（熔化和分馏）。它们形成于靠近太阳的太阳星云区域，那里的条件非常还原，导致陨石具有非常不寻常的矿物学。许多物种是硫化物，而不是硅酸盐，铁镍金属是丰富的。由于它们富含金属的条件和还原的性质，顽火辉石陨石被认为是我们与水星最接近的类比。我们将对一组顽火辉石陨石中的不透明矿物进行全面彻底的分析。我们将通过光学和电子显微镜检查金属、硫化物、磷化物和铬铁矿，并通过质谱法测量铁、镍、铜、硫和惰性气体的成分。这个研究项目的目的是找出顽火辉石陨石是如何形成和演变的，以及它们是否可以用来为欧空局的Bepi-Colombo水星使命做准备。

The enstatite meteorites are a unique set of rocks that span a range of compositions from primitive (unchanged) to processed (melted and fractionated). They formed in a region of the solar nebula close to the sun where conditions were highly reducing, resulting in the meteorites having a very unusual mineralogy. Many species are presnt as sulphides, rather than silicates, and iron-nickel metal is abundant. Because of their metal-rich condition and reduced nature, it has been suggested that enstatite meteorites are the closest analogy that we have to the planet Mercury. We will carry out a complete and thorough analysis of opaque minerals from a suite of enstatite meteorites. We will examine metal, sulphides, phosphides and chromites by optical and electron microscopy, as well as measuring the iron, nickel, copper, sulphur and noble gas compositions by mass spectrometry. The purpose of this research project is to find out how the enstatite meteorites formed and evolved, and whether they can be used to prepare for ESA's Bepi-Colombo mission to Mercury.