Gamma-spectrometric analysis was used for six sediment cores from the area occupied by metalliferous sediments in the Southeast Pacific. In five of these cores vertical distribution curves of 230Th enabled positions of equilibrium points to be determined and sediments to be dated. The ionium curve was normalized for one core. Vertical distribution of 230Th in metalliferous sediments resembles its distribution in normal ocean-floor sediments beyond the area of influence of active ridges. Sedimentation rates lay within the range 0.7-12.3 mm/ky.

Supplement to: Kuznetsov, Yury V; Al'terman, E I; Lisitzin, Alexander P (1981): Rates of deposition of metalliferous sediments in the Southeast Pacific Ocean. Oceanology, 21(2), 220-227