Abstract: Compilation consists of 235U/238U and 234U/238U compositions of a range of samples including Ocean Island Basalts, Mid-Ocean ridge basalt glasses, ocean-floor volcaniclastics and altered oceanic crust. These samples provide a data-set to constrain the U isotopic composition in different materials on Earth. Other Description: Andersen, Morten; Elliott, Tim; Freymuth, Heye; Sims, Kenneth; Niu, Yaoling; Kelley, Katherine (2015) The terrestrial U isotope cycle. Nature 517, pgs. 356-359. doi: 10.1038/nature14062.