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Sulfur and chlorine budgets control the ore fertility of arc magmas

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  • Carter Grondahl

    (University of Toronto)

  • Zoltán Zajacz

    (University of Toronto
    University of Geneva)

Abstract

Continental arc magmas supply the ore-forming element budget of most globally important porphyry-type ore deposits. However, the processes enabling certain arc segments to preferentially generate giant porphyry deposits remain highly debated. Here we evaluate the large-scale covariation of key ore-forming constituents in this setting by studying silicate melt inclusions in volcanic rocks from a fertile-to-barren segment of the Andean Southern Volcanic Zone (33–40 °S). We show that the north-to-south, fertile-to-barren gradient is characterized by a northward increase in S and Cl concentrations and a simultaneous decrease in Cu. Consequently, we suggest that the concentration of S and Cl rather than the concentration of ore metals regulates magmatic-hydrothermal ore fertility, and that the loss of volatiles prior to arrival in the upper crust impacts ore-forming potential more than magmatic sulfide saturation-related ore metal scavenging.

Suggested Citation

  • Carter Grondahl & Zoltán Zajacz, 2022. "Sulfur and chlorine budgets control the ore fertility of arc magmas," Nature Communications, Nature, vol. 13(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-31894-0
    DOI: 10.1038/s41467-022-31894-0
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    References listed on IDEAS

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    1. Antoine Bénard & Kevin Klimm & Alan B. Woodland & Richard J. Arculus & Max Wilke & Roman E. Botcharnikov & Nobumichi Shimizu & Oliver Nebel & Camille Rivard & Dmitri A. Ionov, 2018. "Oxidising agents in sub-arc mantle melts link slab devolatilisation and arc magmas," Nature Communications, Nature, vol. 9(1), pages 1-10, December.
    2. M. D. Jackson & J. Blundy & R. S. J. Sparks, 2018. "Chemical differentiation, cold storage and remobilization of magma in the Earth’s crust," Nature, Nature, vol. 564(7736), pages 405-409, December.
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    Cited by:

    1. Jia Chang & Andreas Audétat & Thomas Pettke, 2024. "The gold content of mafic to felsic potassic magmas," Nature Communications, Nature, vol. 15(1), pages 1-10, December.

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