The evolution of material in the inner solar system: Elucidating the history of enstatite chondrites

太阳系内部物质的演化：阐明顽辉石球粒陨石的历史

• 批准号: 2285741
• 金额: --
• 依托单位: The Open University
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2019
• 资助国家: 英国
• 起止时间: 2019 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2285741
• 关键词: evolution; material; inner; solar; system

The solar system formed from a disk of dust and gas, and this can be analysed using meteorites that date from this time. The student will undertake a detailed study of materials that date from this time and place - specifically the enstatite meteorites, which may have originated in the innermost part of the disk.Chondritic meteorites are relicts from the early solar system composed largely of sub-spherical um-to-mm sized objects called chondrules. Enstatite chondrites are isotopic twins to the Earth-Moon system, suggesting a genetic connection.In addition, recent orbital data from the MESSENGER mission to Mercury have shown that it has chemical similarities to the enstatite chondrites, for example high sulphur abundances and Mg/Si ratios.This rare meteorite group (only around 500 enstatite meteorites are known) are therefore highly likely to be products of the inner solar system; if not direct ancestors then possible 'aunts' to the terrestrial planets.The enstatite chondrites are remarkable for their extremely reduced mineralogy; sulphides and metal are very abundant and the main silicate is FeO-poor enstatite. Reduced C and N bearing minerals such as SiC, graphite and nierite (Si3N4) are relatively abundant. High temperature solids such as calcium aluminium-rich inclusions (CAIs) are rare.The student will analyse the chemistry and isotope systematics of individual, pristine, chondrules, CAIs and isolated sulphide grains from the most primitive available enstatite chondrites.

太阳系是由尘埃和气体组成的圆盘形成的，这可以用当时的陨石来分析。学生将对这个时间和地点的材料进行详细的研究-特别是顽火辉石陨石，它可能起源于圆盘的最内部。球粒陨石是早期太阳系的残余物，主要由亚球形的微米到毫米大小的物体组成，称为球粒。顽火辉石陨石是地月系统的同位素双胞胎，表明存在遗传联系。此外，信使号使命最近对水星的轨道数据表明，它与顽火辉石陨石具有化学相似性，例如高硫丰度和Mg/Si比。这种罕见的陨石群（已知的顽火辉石陨石只有500颗左右）因此极有可能是内太阳系的产物;如果不是直接的祖先，那么可能是类地行星的“阿姨”。顽火辉石顽火辉石以其极其还原的矿物学而闻名;硫化物和金属非常丰富，主要的硅酸盐是贫FeO的顽火辉石。含还原碳、氮矿物如SiC、石墨和镍铁矿（Si_3N_4）相对丰富。高温固体，如富钙铝包体（CAIs）是罕见的。学生将分析化学和同位素系统学的个人，原始，球粒，CAIs和孤立的硫化物颗粒从最原始的顽火辉石。