Structurally bound S2-, S1-, S4+ S6+ in terrestrial apatite: The redox evolution of hydrothermal fluids at the Phillips mine, New York, USA

摘要

The oxidation state of sulfur (S) plays a critical role in the formation of igneous and hydrothermal mineral systems. Constraining the oxidation state of S during mineralization and alteration is a valuable tool for understanding primary versus secondary processes that affect mineral systems. Recent experimental studies demonstrate that apatite, which is a ubiquitous accessory mineral in igneous and hydrothermal ore-forming systems, structurally incorporates multiple oxidation states of S (i.e., S6+, S4+, S2-), and that the abundance of reduced versus oxidized S in apatite is systematically related to oxygen fugacity.