¹Yue Zhang, ^1,2,3Hejiu Hui, ³Sen Hu, ³Jialong Hao, ³Ruiying Li,³Wei Yang, ⁴Qiuli Li, ³Yangting Lin, ⁴Xianhua Li, ⁴Fuyuan Wu
Earth and Planetary Science Letters 644, 118933 Link to Article [https://doi.org/10.1016/j.epsl.2024.118933]
¹State Key Laboratory for Mineral Deposits Research & Lunar and Planetary Science Institute, School of the Earth Sciences and Engineering, Nanjing University, Nanjing, Jiangsu 210023, PR China
²CAS Center for Excellence in Comparative Planetology, Hefei, Anhui 230036, PR China
³Key Laboratory of the Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, PR China
⁴State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, PR China
Copyright Elevier

Lunar materials have recorded a very large δ37Cl variation, and the mechanism causing this variation has yet to be determined. We measured the F and Cl contents and the δ37Cl in Chang’e-5 impact glass beads using a nanoscale secondary ion mass spectrometry. These glass beads exhibit the largest δ37Cl variation observed to date, ranging from –0.7 ‰ to 119 ‰. Furthermore, the δ37Cl values are roughly negatively correlated with the Cl concentration. The correlations between F and Cl concentrations differ for homogeneous and heterogeneous glass beads. Our calculations indicate that NaCl (g) and HCl (g) degassing may have been the pivotal mechanism that elevated the δ37Cl value, with >50 % of Cl in the melt evaporating during glass formation. The glass beads may have incorporated the chlorine species condensed from early evaporation. Our results provide direct evidence to constrain the impact-induced degassing process of Cl on airless celestial bodies.