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Scientific article
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English

Sulfur and chlorine budgets control the ore fertility of arc magmas

Published inNature communications, vol. 13, no. 1, 4218
Publication date2022-07-21
First online date2022-07-21
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.

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Funding
  • Society of Economic Geologists Foundation - [n.a.]
Citation (ISO format)
GRONDAHL, Carter, ZAJACZ, Zoltan. Sulfur and chlorine budgets control the ore fertility of arc magmas. In: Nature communications, 2022, vol. 13, n° 1, p. 4218. doi: 10.1038/s41467-022-31894-0
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Article (Published version)
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ISSN of the journal2041-1723
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