Speciation of Nb and Ta in magmatic-hydrothermal titanite and ilmenite: Insights from combined SXAS and XPS analyses and implications for Nb/Ta systematics

The supporting information in this document contains captions for Figures. S1 and S2 (*jpeg), captions for Tables S1 to S7 (*xlsx), as well as references from the supporting information. Tables S1-S7. Raw dataset for Figure 2-8.
Fig. S1. (a) Sketched map showing the location of Qinling Orogenic Belt; (b) The distribution of Nb-REE deposits associated with alkaline rocks and carbonatites. The locations of the Fangcheng and Ziyang Nb deposits are marked with red boxes.
Fig. S2 Measurements of the Nb K-edge of Nb compounds as well as natural and synthetic Nb-bearing minerals reported in literature in XANES (X-ray adsorption near-edge) spectra have been assembled here (after Martin and Wülser , 2014).