Δ-δ Plot for quartz-magnetite pairs

Δ-δ plot for quartz-magnetite pairs in rocks from Pea Ridge deposit (Δ¹⁸O_{quartz-magnetite} = δ¹⁸O_quartz − δ¹⁸O_magnetite). Data for individual minerals form linear trends that are nominally consistent with isotopic equilibration under closed-system conditions of originally hydrothermal or igneous mineral pairs. Abbreviations: Amp = amphibole, Mag = magnetite, Qz = quartz. From Johnson and others, 2016, doi:10.2113/econgeo.111.8.2017.