Primary Sulfur Isotopes of Intraplate Basalts and Implications for Deep S Recycling of Altered Oceanic Crust
Abstract Altered oceanic crust (AOC) is the largest contributor to the subducted sulfur (S) budget and its recycling modulates the redox evolution and S distribution in the mantle. However, the role of AOC in the deep cycling of S remains poorly constrained. Here we probe the primary S isotopes of Cenozoic intraplate basalts in eastern China by investigating sulfide inclusions in magmatic clinopyroxene megacrysts. These basalts were derived from the deep mantle metasomatized by melts derived from recycled AOC but show MORB‐like S isotopes (−0.9–0.9‰), suggesting that AOC‐derived melts transfer negligible sulfate and hardly change the δ 34 S and redox state of the deeper mantle. This contrasts with the generally high δ 34 S values of mantle wedge peridotites and primary arc magmas that reflect the slab addition of sulfate, indicating that S species and isotopes released from the subducted slab and associated f O 2 are not constant and vary with subduction depth.
Authors
- Lang Wang (ORCID: https://orcid.org/0000-0001-8315-3499)
- Zaicong Wang (ORCID: https://orcid.org/0000-0002-3584-1673)
- Pu Sun (ORCID: https://orcid.org/0000-0001-9488-254X)
- Stephen Foley (ORCID: https://orcid.org/0000-0001-7510-0223)
- Zong‐Feng Yang (ORCID: https://orcid.org/0000-0003-4374-2189)
- Zongqi Zou (ORCID: https://orcid.org/0000-0001-9833-4794)
- Keqing Zong (ORCID: https://orcid.org/0000-0002-7106-0348)
- Zhaochu Hu (ORCID: https://orcid.org/0000-0001-8415-7811)
- Xiang Wang (ORCID: https://orcid.org/0000-0002-5672-6279)
- Wen Zhang (ORCID: https://orcid.org/0000-0001-5102-3868)
- Yongsheng Liu (ORCID: https://orcid.org/0000-0002-9340-9205)
Institutions
- Australian National University (AU)
- Chinese Academy of Sciences (CN)
- China University of Geosciences (CN)
- China University of Geosciences (Beijing) (CN)
- Institute of Oceanology (CN)
- Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) (CN)
- Macquarie University (AU)
Publication Details
- Journal
- Geophysical Research Letters
- Published
- 2024-12-11
- DOI
- https://doi.org/10.1029/2024gl111829
- Citations
- 2
- Primary Topic
- Geological and Geochemical Analysis
- Type
- article
- Field-Weighted Citation Impact
- 1.07
Funders
- National Natural Science Foundation of China
- China University of Geosciences
- State Key Laboratory of Geological Processes and Mineral Resources
- National Key Research and Development Program of China