Water concentration as a function of position in silicates from diffusion couple experiments. Data can be used to determine diffusivity of water in the silicate melt. Also numerical model for analysis of dataset and associated user guide.

This dataset contains bulk rock, glass, melt inclusion and host phenocryst geochemical compositions for materials from Tolbachik volcanic field, Kamchatka, Russia, together with supporting petrographic information. Sampling localities are provided together with the bulk rock compositional data. Samples were acquired between 2016 and 2019 and the data were collected between 2016 and 2020 using secondary electron microscopy, electron microprobe analysis, secondary ion mass spectrometry, laser ablation ICP-MS, X-ray fluorescence and solution ICP-MS, and multi-collector ICP-MS methods. Most of the data are included in a manuscript (Iveson et al.) to be submitted to Journal of Petrology in March 2022.

Ab initio trajectories for the equilibrated MgO-SiO2-H2O melts at T = 1800 K and 3000 K are provided as "XDATCAR" files output directly from VASP for each simulation interval. Corresponding stress tensor components, required for calculation of viscosity via the autocorrelation function, together with the energy, temperature, and pressure are also provided for each iteration of the equilibrated trajectories. A full data inventory is provided in the READ_ME.txt file.

Major and trace element data for partial melts derived from high pressure-temperature experiments on a basaltic starting composition from the Ontong Java Oceanic Plateau.