Isotope anomalies in meteoritic materials and the dynamical evolution of the solar nebula: Constraints from Cr, Ti and O isotopes

陨石材料中的同位素异常和太阳星云的动力学演化：Cr、Ti 和 O 同位素的限制

• 批准号: 211716935
• 负责人: Professor Dr. Thorsten Kleine
• 金额: --
• 依托单位: Abteilung Isotopengeologie
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/211716935?language=en
• 关键词: Isotope; anomalies; meteoritic; materials; dynamical

Variations in the isotopic composition of meteorites and their components play a pivotal role in understanding the chemical and isotopic evolution of the solar nebula and the dynamics of transport and mixing of primordial dust within the protoplanetary disk. In this study, we will investigate Cr and Ti isotope variations in components of primitive chondrites with a particular focus on chondrules and matrix. We will investigate the extent to which these chondrite components are isotopically heterogeneous and as to whether these components are isotopically distinct among the different chondrite groups. A second major focus of this study will be the systematic and combined investigation of isotope anomalies that reflect a heterogeneous distribution of distinct nucleosynthetic components in the nebula dust (e.g., 54Cr chondrules and matrix) with those that reflect the isotopic evolution of the nebula gas and its interaction with solid phases (O isotopes). One of the major outcomes of this study will be to provide new and firm constraints on the isotope variability throughout the protoplanetary disk and its imprint on the bulk chemical and isotopic evolution of planetary reservoirs within the inner solar system. These data will provide critical information regarding the dynamical evolution of the early solar nebula.

陨石及其成分的同位素组成的变化在理解太阳星云的化学和同位素演化以及原行星盘内原始尘埃的运输和混合动力学方面起着关键作用。在这项研究中，我们将探讨铬和钛同位素的变化，特别是对球粒陨石和基质的原始辉长岩成分。我们将调查这些球粒陨石成分的同位素异质性的程度，以及这些成分是否在不同球粒陨石群中同位素不同。这项研究的第二个主要重点将是对同位素异常进行系统和综合的调查，这些异常反映了星云尘埃中不同核合成成分的不均匀分布（例如，54Cr球粒和基质）与那些反映星云气体的同位素演化及其与固相（O同位素）的相互作用。这项研究的主要成果之一将是对整个原行星盘的同位素变异性及其对太阳系内部行星储层的大量化学和同位素演变的影响提供新的和坚定的限制。这些数据将提供有关早期太阳星云动态演化的关键信息。