An empirical model of Cl and Mo fluid/melt partitioning in felsic upper-crustal magmatic-hydrothermal systems: The effects of fluid salinity and silicate melt composition

This dataset is part of the supplement of Gennaro et al. (2025) under the same title. The dataset provides raw output from electron microprobe analyses (EPMA), output from the SILLS software to quantify data following laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS), and integrated areas of water bands in selected samples analyzed using Raman spectroscopy. All data comes from a suite of experimental glasses (Table S1) and corresponding synthetic fluid inclusions (Table S2). The full methodology of each analytical technique can be found in the corresponding manuscript. These data are used to determine the effect of melt aluminum saturation index (ASI) and fluid Cl concentration on the fluid/melt partitioning behaviour of Mo and Cl.

Table S1: A compilation of measurements performed on run product glasses for all experiments. Each Excel sheet represents a different experiment and consists of three tables labelled a–c or a–d. Table a is composed of EPMA measurements on major elements, reported here as oxides. Table b provides Cl concentrations as determined by using EPMA on different spots than those analyzed for major elements. Table c gives the concentrations of Na2O, trace elements, and the distance of each measurement point from the rim of the run product glass measured using LA-ICP-MS. Values highlighted in red are not considered as part of the mean concentration of their corresponding element. These values were filtered on the basis of distance from the rim or, occasionally, contamination due to micro-inclusions or unseen quench crystals in the glass. Table d, if included, contains one column listing the integrated area of the water peak of each Raman signal collected. The second column displays the calculated water concentration in the glass using the equation derived from measurements of standards. Rhyolitic glass standards containing 2 and 5 wt% H2O yielded integrated areas of 197265 ± 13055 and 499405 ± 28652 (1σ error; 6 spectra each) respectively, yielding a calibration curve of with an R2 coefficient of 1.
Table S2: A compilation of individual LA-ICP-MS analyses of synthetic fluid inclusions from all experiments. The very few (<5%), easily identifiable outliers shown in red were not considered as part of the mean of their corresponding element concentration on the basis of the poor quality of the LA-ICP-MS signal. Poor signals and outlier behaviour were caused by fracturing of quartz upon ablation, ambiguous signal spikes, or abnormally large signal tails resulting from contamination in the quartz matrix along microfractures or sub-microscopic necking which were not visible petrographically.