Hf and Nd isotopes in marine sediments: Constraints on global silicate weathering Bayon, G. ; Burton, K. W. ; Vigier, N. ; Dennielou, B. ; Ponzevera, E. ; German, C. R. ; Nesbitt, R. W. Abstract Publication: Geochimica et Cosmochimica Acta Supplement Pub Date: July 2008 Bibcode: 2008GeCAS..72R..60B