Nucleosynthetic isotope anomalies of zinc in meteorites constrain the origin of Earth?s volatiles

• 成果类型: Article
• 署名作者: Martins, Rayssa; Kuthning, Sven; Coles, Barry J.; Kreissig, Katharina; Rehkamper, Mark
• 署名单位: Imperial College London; Shimadzu Corporation
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-13150
• DOI: 10.1126/science.abn1021
• 发表日期: 2023-01-27
• 页码: 369-372
• 关键词: early solar-system; condensation temperatures; primitive meteorites; building-blocks; ELEMENTS; chondrites; zn; Heterogeneity; accretion; search

摘要

Material inherited from different nucleosynthesis sources imparts distinct isotopic signatures to meteorites and terrestrial planets. These nucleosynthetic isotope anomalies have been used to constrain the origins of material that formed Earth. However, anomalies have only been identified for elements with high condensation temperatures, leaving the origin of Earth's volatile elements unconstrained. We determined the isotope composition of the moderately volatile element zinc in 18 bulk meteorites and identified nucleosynthetic zinc isotope anomalies. Using a mass-balance model, we find that carbonaceous bodies, which likely formed beyond the orbit of Jupiter, delivered about half of Earth's zinc inventory. Combined with previous constraints obtained from studies of other elements, these results indicate that similar to 10% of Earth's mass was provided by carbonaceous material.