Fig. 4 Modeled evolution of H2S and Au in hydrothermal fluids and pyrite for CTGD systems. Modeled evolution of H2S and Au in hydrothermal fluids and pyrite.

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Fig. 4 Modeled evolution of H2S and Au in hydrothermal fluids and pyrite for CTGD systems. Modeled evolution of H2S and Au in hydrothermal fluids and pyrite for CTGD systems. Reaction of hydrothermal fluids with reactive Fe at concentrations common in CTGD leading to Au-rich pyrite. Numerical model assumes complete consumption of H2S from the fluid to form pyrite. Au concentration depends either on partitioning (at low degrees of pyritization) or supersaturation due to sulfidation (at high degrees of pyritization). The gold solubility limit will decrease during pyritization as Au is consumed because of partitioning. The onset of sulfidation causes a marked increase in modeled Au concentration in pyrite. Under these conditions, typical compositions of CTGD pyrite are only formed at the very end of pyritization (gray field). When partitioning is the major ore-forming process, typical CTGD compositions are produced during the course of pyritization. Ore grades are calculated from amounts of fluid and rock and initial Au concentration (see the Supplementary Materials). C. Kusebauch et al. Sci Adv 2019;5:eaav5891 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY).