Tungsten concentrations and tungsten EXAFS and XANES data in hydrothermal solutions

Tungsten concentrations in aqueous fluids in equilibrium with tungsten oxides and synthetic scheelite (CaWO3) at pressures up to 50 MPa and temperatures up to 400°C. Further, EXAFS and XANES data for constraining the W species up to 400°C and up to 60 MPa. The dataset consists of i) experimentally determined W concentrations at pressure and temperature in H2O, HCl-solutions and NaCl-solutions; the concentration were determined by the x-ray absorption technique in situ at pressure and temperature; ii) EXAFS and XANES spectra and associated fit results for constraining the W-species in the fluid; iii) results of thermodynamic modelling based on thermodynamic properties derived from the W solubility data and data from the literature.

The over-riding goal of the DFG priority programm 2238 - DOME (https://www.uni-potsdam.de/en/spp2238/) is to find solutions to fundamental questions of element transport and mineralization in heterogeneous chemical systems that are complex, dynamic and highly transient. The topic of ore genesis has been studied for a long time from a combined field/laboratory perspective and also experimentally in simplified systems, but rarely have these techniques been integrated in a coordinated way with the third perspective from numerical process modeling. The originality and innovation potential of this priority program lies in the coordination of empirical field-related studies that define the geological/mineralogical framework of natural ore systems with experimental work and numerical models that provide a quantitative understanding of the processes involved.