Abstract
Another study of lead-isotope compositions in marine manganese nodules has been made, using the double-spike method in conjunction with an absolute isotope standard. Observed 206Pb/204Pb and 208Pb/204Pb ratios are higher, or more radiogenic, than the corresponding zero model-age ore-lead abundances (end points of the primary ore-lead growth curves). Many of the leads, however, are probably present-day products of the ore-lead system. Total 207Pb/204Pb variation is much less than that found by Chow and Patterson in 1962. The rather small variations probably result in part from a simple mixing of lead derived from crustal and mantle sources.
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