Investigating the water and volatile inventory of unequilibrated ordinary chondrites

研究不平衡的普通球粒陨石的水和挥发物库存

• 批准号: 2325761
• 金额: --
• 依托单位: University of Manchester
• 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: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2325761
• 关键词: Investigating; water; volatile; inventory; unequilibrated

Liquid water is one of the vital ingredients that allowed the emergence of life in the Solar System. Therefore, understanding the origin(s) of Solar System water is an active area of Solar System science research. Water is ubiquitous in the Solar System, and is present in most of the planets and their satellites, as well as asteroids and comets. The volatile-rich carbonaceous chondrite meteorites are thought to constitute some of the most primitive Solar System objects, and have thus been the focus of most of the studies on water in the early Solar System. On the other hand, the volatile inventory of ordinary chondrite meteorites has received much less attention, despite the fact that these meteorites, which represent the large majority of samples in our meteorite collections, probably sample asteroid-types that played an important role during formation of terrestrial planets. The goal of this project is to fill this important knowledge gap by constraining the volatile budget of unequilibrated ordinary chondrites.We will investigate the water and volatile inventory of around 15-20 unequilibrated ordinary chondrite meteorites using a combination of petrological, geochemical and spectroscopic techniques. The mineralogy of the samples will be examined using XRD analysis, infrared spectroscopy and electron beam techniques. The abundance and isotopic composition of water and other volatile species (e.g., N, S, and Cl) will be determined in selected samples using transmission infrared spectroscopy and secondary ion mass spectrometry. This original dataset obtained on water and volatiles in ordinary chondrite meteorites will eventually permit testing of our existing models for the origin and processing of water and volatiles in the early Solar System.

液态水是太阳系中生命出现的重要成分之一。因此，了解太阳系水的起源是太阳系科学研究的一个活跃领域。水在太阳系中无处不在，并且存在于大多数行星及其卫星以及小行星和彗星中。富含挥发物的碳质球粒陨石被认为是太阳系中最原始的天体之一，因此也是早期太阳系中大多数水研究的焦点。另一方面，普通球粒陨石的不稳定库存受到的关注要少得多，尽管这些陨石代表了我们陨石收藏中的绝大多数样品，可能是在类地行星形成过程中发挥重要作用的小行星类型的样品。本项目的目标是通过限制不平衡普通球粒陨石的挥发性预算来填补这一重要的知识空白。我们将使用岩石学，地球化学和光谱技术相结合的方法研究大约15-20个不平衡普通球粒陨石的水和挥发性库存。样品的矿物学将使用XRD分析、红外光谱和电子束技术进行检查。水和其他挥发性物质的丰度和同位素组成（例如，将使用透射红外光谱法和二次离子质谱法测定选定样品中的氮、硫和氯）。这个原始数据集获得的水和挥发物在普通球粒陨石最终将允许测试我们现有的模型的起源和处理的水和挥发物在早期太阳系。