Health AI Central
Peer-Reviewed Publication
Sci Adv2026;12(36):eaed1386.September 4, 2026Journal Article

Variable redox states of sulfur in porphyry copper-fertile arc magmas.

Xuyang Meng1, Adam C Simon2, Jingwen Mao3, Brian A Konecke4, Kouki Kitajima5, Owen K Neill2
1State Key Laboratory of Geological Processes and Mineral Resources/Ministry of Natural Resources Key Laboratory for Exploration Theory and Technology of Critical Mineral Resources, School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China.
2Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI 48109, USA.
3MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences (CAGS), Beijing 100037, China.
4Fathom Geophysics LLC, Newark, OH 43056, USA.
5Department of Geoscience, University of Wisconsin, Madison, WI 53706, USA.
PubMed DOI

Abstract

Porphyry copper systems formed in magmatic arcs represent the largest concentrations of copper and most massive anomalies of sulfur worldwide. Whether the ore-fluid-source magmas were dominated by oxidized or reduced sulfur remains the subject of intense debate. Here, we quantitatively measured in situ the relative abundances of S6+, S4+, and S2- in sulfur-bearing primary apatite grains hosted in…

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