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Table 1 presents data on the uranium, thorium, and lead contents and lead isotopic composition of three sediment samples: one from the metalliferous mud at Site 226 (southwestern Atlantis II Deep) 4.5 meters depth, one from the post-evaporite deposits at Site 227 (eastern flank of Atlantic II Deep) 153.5 meters depth, and one from the dark siltstone within the evaporites at Site 228 (southern Red Sea on the Sudanese or western side) 322 meters depth. Also included are U-Th-Pb data on pore water and basalt from Site 226. The concentration data on the sediments were obtained by isotope dilution on whole-rock samples decomposed with an HF-HCIO4 mixture and dissolved in 1:1 HNO3. A small amount of residue, apparently hematite, remained. If the residue was rich in uranium, thorium, and/or lead, our concentrations of these elements might be low. The isotopic compositions on the sediments were determined on HNO3-soluble lead (1:1) for all three samples, checked by an HF-HCIO4 decomposition on the lead-rich sample from Site 226. No difference was found between the two kinds of analyses of the sample from Site 226.

Preliminary Report on Uranium, Thorium, and Lead Contents and Lead Isotopic Composition in Sediment Samples from the Red Sea