Scholarlink

<p>The genesis of Archean continental crust through partial melting of hydrous mafic protolith is widely acknowledged, yet the origin of the mafic protolith remains highly contentious. Silicon isotopes and quadruple sulfur isotopes serve as particularly powerful tools in this regard, as they directly trace the source nature of the felsic continent. Here, we integrate whole-rock silicon and sulfur isotopic data of Neoarchean granitoids from the North China Craton to constrain the origin and pathway of their protoliths. These granitoids exhibit non-zero Δ³³S (0.01‰ to − 0.24‰) and elevated δ³⁰Si ( − 0.09‰ to −0.05‰), requiring a supracrustal source and contrasting with the previously reported mantle-like zircon δ<sup>18</sup>O. Global compilation shows that granitoids formed after 3800 Ma uniformly contain enriched δ³⁰Si and non-zero Δ³³S, implying that most, if not all Archean continental crusts were derived from partial melting of supracrustal sources rather than unaltered mafic cumulates.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Coupled sulfur-silicon isotopes reveal supracrustal origin of Archean continents

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年5月11日

查看全文
  • Kun Shang,
  • Jian Zhang,
  • Zaicong Wang,
  • Ian Cawood,
  • Yawen Cui,
  • Ming Li,
  • Ruihong Chang,
  • Yanan Shen,
  • Guochun Zhao

摘要

The genesis of Archean continental crust through partial melting of hydrous mafic protolith is widely acknowledged, yet the origin of the mafic protolith remains highly contentious. Silicon isotopes and quadruple sulfur isotopes serve as particularly powerful tools in this regard, as they directly trace the source nature of the felsic continent. Here, we integrate whole-rock silicon and sulfur isotopic data of Neoarchean granitoids from the North China Craton to constrain the origin and pathway of their protoliths. These granitoids exhibit non-zero Δ³³S (0.01‰ to − 0.24‰) and elevated δ³⁰Si ( − 0.09‰ to −0.05‰), requiring a supracrustal source and contrasting with the previously reported mantle-like zircon δ18O. Global compilation shows that granitoids formed after 3800 Ma uniformly contain enriched δ³⁰Si and non-zero Δ³³S, implying that most, if not all Archean continental crusts were derived from partial melting of supracrustal sources rather than unaltered mafic cumulates.