U-Pb geochronology of wolframite from Polski Gradets, Bulgaria and Barruecopardo, Spain, using in situ LA-ICP-MS technique

This study presents U-Pb age data obtained using an in situ LA-ICP-MS technique applied to wolframite samples from Polski Gradets (Bulgaria) and Barruecopardo (Spain). Analytical conditions were optimized using YGX2113 (wolframite) and GJ1 (zircon) natural standard reference materials (SRMs). Applying both SRMs, very similar U-Pb age results were obtained. Furthermore, the results were within the reported age error range of the host granites and granodiorites. The tungsten mineralization at Barruecopardo was dated at 315.2±5.3 Ma, while for Polski Gradets wolframite, an age of 79.0±6.8 Ma was obtained. The applied technique is assessed as applicable and suitable for further direct dating of tungsten deposits.