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We present the first large sample of accurate iron abundances andtemperatures for clusters at redshifts greater than 0.14. We find that the Feabundance shows little or no evolution out to redshift 0.3. This and the earlyformation epoch of elliptical galaxies in clusters indicate that most of theenrichment of the intracluster medium occurred at redshifts greater than 1. Ifclusters represent fair samples of the universe, then global metal productionis 2-5 times greater than is inferred from recent studies of galaxies at lowand high redshifts.Comment: 9 pages Latex plus 3 postscript files, uses aaspp4.sty, accepted for  publication in ApJ Letter

Lack of Evolution in the Iron Abundance in Clusters of Galaxies and Implications for the Global Star Formation Rate at High Redshift