Abstract: In order to study the origin and the evolution of recent volcanic rocks,aseparate technique and a mass spectral method are described in detail. In ourwork Nd and Sr are corrected for isotopic fractionation to ~(148)NdO/~(144)NdO=0.242436, ~(86)Sr/~(88)Sr=0.1194, respectively. The reliable data have been ob-tained, thus leading to geologically significant conclusions in the study ofNd-Sr system from volcanic rocks.