Constraining the origin of chondrules and tracking the early Solar System history using vanadium, chromium and magnesium isotopes

使用钒、铬和镁同位素限制球粒的起源并追踪早期太阳系历史

• 批准号: EP/Y014898/1
• 负责人: Ke Zhu
• 金额: $ 23.84万
• 依托单位: University of Bristol
• 依托单位国家: 英国
• 项目类别: Fellowship
• 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=EP%2FY014898%2F1
• 关键词: Constraining; origin; chondrules; tracking; early

Chondrules are the major component of the most primitive, chondritic meteorites and so are believed to intrinsically linked to accretion of planetary embryos. As such, constraining the timing and origin of chondrules is central for understanding the early evolution of the solar system and the formation of planets. My project, "V-Mg-Cr-Chondrule: Constraining the origin of chondrules and tracking the early Solar System history using vanadium, chromium and magnesium isotopes", tackles outstanding issues on the timing, location and volatile history of chondrule formation. I will apply the V isotope method to study the location of chondrule formation, from the influence of solar irradiation, which I will compare with 54Cr systematics (nucleosynthetic anomalies) often taken to track position in a heterogeneous nebula. Coupled radiogenic Cr (my experience) and Mg (expertise from the host) isotope measurements can further date the chondrule formation (53Mn-53Cr and 26Al-26Mg short-lived chronology), and Cr and Mg stable isotope measurements further trace their volatile history. This simultaneous application of three isotope systems offers a novel means to address major current ambiguities in understanding chondrule formation, which gives significant insights into both earth sciences and astronomy.

球粒是最原始的球粒陨石的主要组成部分，因此被认为与行星胚胎的增生有内在联系。因此，限制球粒的时间和起源对于理解太阳系的早期演化和行星的形成至关重要。我的项目“V-Mg-Cr-球粒：利用钒、铬和镁同位素限制球粒的起源并追踪早期太阳系历史”，解决了球粒形成的时间、位置和不稳定历史方面的突出问题。我将应用 V 同位素方法从太阳辐射的影响来研究球粒形成的位置，并将其与经常用于跟踪异质星云位置的 54Cr 系统学（核合成异常）进行比较。耦合放射性 Cr（我的经验）和 Mg（来自宿主的专业知识）同位素测量可以进一步确定球粒形成的年代（53Mn-53Cr 和 26Al-26Mg 短暂年代学），而 Cr 和 Mg 稳定同位素测量则进一步追踪其挥发历史。三种同位素系统的同时应用提供了一种新颖的方法来解决当前理解球粒形成方面的主要模糊性，这为地球科学和天文学提供了重要的见解。