(U-234/U-238) and (Th-230/U-238) disequilibria in fresh and altered Kolbeinsey Ridge basalts - Elkins, L; Sims, K; Prytulak, J; Mattielli, N; Elliott, T; Blichert-Toft, J; Blusztajn, J; Devey, C; Mertz, D; Kelemen, P; Murrell, M; Schilling, J (2009)