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<p>The Moon is strongly depleted in volatile elements and exhibits heavier isotopic signatures (e.g., K, Zn) than the Earth. However, the pronounced nearside–farside dichotomy and uneven distribution of volatiles across lunar interior raise the question of whether such heavier isotopic signatures resulted from a global giant impact or local magmatic processes. Here we report high sulfur contents (1800 ± 400 µg/g) and δ<sup>34</sup>S values (0.83 ± 0.16‰, 2SE, n = 17) in Chang’e-6 basalt from lunar farside, with similar δ<sup>34</sup>S values in two nonmare crustal clasts. These values fall within the range reported for nearside mare basalts and basaltic meteorites of different ages and mantle sources, indicating a broadly homogeneous δ<sup>34</sup>S composition across lunar interior that is ~2‰ heavier than the Earth’s mantle. This isotopic signature cannot be explained by core formation or late accretion and is best attributed to global volatile loss during the Moon-forming impact. Subsequent magma ocean evolution and mantle overturn drove heterogeneous volatile budget in lunar mantle.</p>

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Sulfur isotopes from the lunar farside reveal global volatile loss following the giant impact

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月1日

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  • Yiheng Li,
  • Zaicong Wang,
  • Wen Zhang,
  • Keqing Zong,
  • Zhenbing She,
  • Qi He,
  • Jiaqi Zheng,
  • Tianyang Li,
  • Fabin Pan,
  • Xu Chen,
  • Kosta Crnobrnja,
  • Long Xiao,
  • Zhaochu Hu,
  • Xiang Wu,
  • Yongsheng Liu,
  • Julien Siebert,
  • Frédéric Moynier

摘要

The Moon is strongly depleted in volatile elements and exhibits heavier isotopic signatures (e.g., K, Zn) than the Earth. However, the pronounced nearside–farside dichotomy and uneven distribution of volatiles across lunar interior raise the question of whether such heavier isotopic signatures resulted from a global giant impact or local magmatic processes. Here we report high sulfur contents (1800 ± 400 µg/g) and δ34S values (0.83 ± 0.16‰, 2SE, n = 17) in Chang’e-6 basalt from lunar farside, with similar δ34S values in two nonmare crustal clasts. These values fall within the range reported for nearside mare basalts and basaltic meteorites of different ages and mantle sources, indicating a broadly homogeneous δ34S composition across lunar interior that is ~2‰ heavier than the Earth’s mantle. This isotopic signature cannot be explained by core formation or late accretion and is best attributed to global volatile loss during the Moon-forming impact. Subsequent magma ocean evolution and mantle overturn drove heterogeneous volatile budget in lunar mantle.