Abstract
The Patrimonio Santo Antonio and Sao Domingos Granites are located in the northwest portion of the Itaiacoca Belt, which is part of the Apiai Terrane (or tectonic domain), a segment of the southern Ribeira Belt, the major tectonic unit of the Mantiqueira Province (Southeast Brazil). These granites are related to the Cunhaporanga Granitic Suite and are intrusive into metasedimentary rocks of the Itaiacoca Group. The plutons are represented mainly by porphyritic monzogranites, with rare occurrences of syenogranites. The porphyritic monzogranites are ferroan to magnesian, high-K, alkali-calcic, and metaluminous to peraluminous. Trace elements patterns of the granites, which have been locally affected by hydrothermal alteration, suggest an association with magmas emplaced in a late- to post-tectonic setting. The geochemical signatures suggest a mantle source enriched in incompatible elements remobilized from the oceanic crust during subduction. The geochronological age of the Patrimonio Santo Antonio Granite (589 ± 6 Ma, zircon, U-Pb SHRIMP) indicates that the magmatism associated with these plutons occurred between the final stages of evolution of the Cunhaporanga Granitic Suite (ca. 650 to 590 Ma) and the emplacement of the post-orogenic and anorogenic plutons of the Apiai Domain (ca. 590 to 570 Ma).
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