Abstract
Supracrustal rocks of the Santa Terezinha de Goias region, Central Brazil, presumably represent a southern extention of the Mara Rosa magmatic arc tectonically juxtaposed to Archean terrains and consist of a metavolcanic unit and a metasedimentary unit. The aim of the paper is to present and discuss the first U-Pb and Sm-Nd data of rocks beloging to both units of that region. U-Pb data of zircons from a felsic metavolcanic rock interlayered with chlorite-rich schists (metandesites?) yield a concordant age of of 660 My, while the Sm-Nd model age of a variety of chlorite-schists indicate a juvenile age between 1.1 and 1.3 Ga.These data indicate that the metavolcanic rocks are Neoproterozoic in age and may be correlated with rocks of the Mara Rosa magmatic arc.On the other hand, the prevailing provenance of rocks belonging to the metasedimenary unit indicate a Paleoproterozoic, or older, source. Thus, the deposition of both units are explained by means of the erosion of source-areas of variable age.
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