This abstract describes the age for the igneous precursors to several high-grade metamorphic rocks (enderbites and charnokites. They fall in the 2.67-2.81 GA range that it typical for the Jequie complex of the central Sao Francisco Craton. There is a single trans-Amazonian measurement and a single 3.0 Ga inherited core.
As far as I know, the results have not been published in an English language journal, so there is no research blogging link.
Alibert, C., and Vidal, P., 1992, SHRIMP U-Pb age of zircons from the Jequie complex, Sao Francisco Craton, Bahia Brazil, in Fr., S.G., ed., 14th R. S. T.: Toulouse, p. 4.
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