ZirconMelt-H2O–fO2: Integrated Software for Estimating Magmatic Water Content and Oxygen Fugacity from Zircon Trace-Element Data

Magmatic oxygen fugacity (fO2) and dissolved H2O content are fundamental physicochemical parameters governing redox conditions, volatile behavior, mineral stability, and multivalent-element partitioning during magma evolution. Analysis of magmatic fO2 and H2O helps constrain magma differentiation, volatile evolution, and magmatic–hydrothermal processes. ZirconMelt-H2O–fO2 was developed to calculate these parameters from zircon trace-element data paired with user-provided melt compositions or user-designated representative whole-rock proxies, using LREE-I-assisted data review, Ti-in-zircon thermometry, Ce–U–Ti oxybarometry, lattice-strain fitting for melt Ce4+/Ce3+ estimation, NBO/T calculation, and H2O inversion. The graphical interface is available in English and Simplified Chinese and supports batch import and sample-identifier matching of CSV and Excel datasets, user confirmation of calculation settings, export of results to Excel, CSV, and JSON, and generation of standardized plots in SVG, PDF, and PNG formats.