The origin of Earth's volatiles - new constraints from isotopic analyses of meteorites

地球挥发物的起源——陨石同位素分析的新限制

• 批准号: 2887388
• 金额: --
• 依托单位: Imperial College London
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2887388
• 关键词: origin; Earth; volatiles; new; constraints

A key question of Earth's accretion is origin of the building blocks that contributed to Earth's volatile budget. As volatiles are needed for the emergence of life, the question is important as this guides our basic understanding of how habitable planets are formed. In particular, were Earth's volatiles sourced from inner Solar System materials or were they provided by asteroids with 'stray' orbits that originated from the more volatile-rich outer Solar System? To obtain new constraints on the origin of Earth's volatile inventory, this PhD project encompasses analyses of meteorites to determine variations in both mass-dependent and mass-independent isotope compositions of volatile elements, including zinc, cadmium, and tellurium, for various meteorite types and meteorite constituents (such as CAI's and chondrules), as well as terrestrial rocks. Samples from the Moon and Mars are also slated for analysis, to investigate the volatile sources for these bodies. To address this goal, the project involves significant hands-on analytical research in the MAGIC Laboratories at the Department of Earth Science & Engineering of Imperial College London. This includes sample preparation in the clean room facilities and high-precision isotope analyses with one of our three isotope ratio mass spectrometers.

地球吸积的一个关键问题是导致地球预算不稳定的构成要素的起源。由于生命的出现需要挥发物，这个问题很重要，因为它指导我们对宜居行星如何形成的基本理解。特别是，地球的挥发物是来自内太阳系的物质，还是由具有“杂散”轨道的小行星提供，这些小行星源自挥发物更丰富的外太阳系？为了获得对地球挥发物库存起源的新限制，该博士项目包括对陨石进行分析，以确定各种陨石类型和陨石成分（例如 CAI 和球粒）以及陆地岩石的挥发性元素（包括锌、镉和碲）的质量依赖和质量无关同位素组成的变化。来自月球和火星的样本也将进行分析，以调查这些天体的挥发性来源。为了实现这一目标，该项目涉及伦敦帝国理工学院地球科学与工程系 MAGIC 实验室的重要实践分析研究。这包括在洁净室设施中进行样品制备以及使用我们的三个同位素比质谱仪之一进行高精度同位素分析。