Purification: Strontium, neodymium and hafnium are separated from the matrix elements by means of extraction chromatography using Eichrom cation exchange resin following the methods of Pourmand and Dauphas (2010) and Pourmand et al. (2014).
Sr-Nd-Hf isotope measurements: Strontium, neodymium, and hafnium isotope measurements are performed with a Neptune Plus multi-collection inductively coupled plasma mass spectrometer (MC-ICP-MS) following the method in Pourmand et al. (2014).
Pourmand, A. and Dauphas, N., 2010. Distribution coefficients of 60 elements on TODGA resin: 28 Application to Ca, Lu, Hf, U and Th isotope geochemistry. Talanta 81, 741-753.
Pourmand, A.; Prospero, J. M. and Sharifi, A., 2014: Geochemical fingerprinting of trans-Atlantic African dust based on radiogenic Sr-Nd-Hf isotopes and rare earth element anomalies. Geology, vol.42, pp.675-678.