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  • This dataset contains bulk geochemistry of pillow basalt collected at the Polaris hydrothermal field on the ultraslow-spreading Gakkel Ridge, Arctic Ocean. The samples were collected during R/V Polarstern Expedition PS101. Major elemental compositions were obtained via X-ray fluorescence spectrometry on fused glass beads. Details on the analytical procedure and uncertainties can be found in Albers et al. (submitted).