ITAPECERICA METAMAFIC-ULTRAMAFIC ROCKS WITH E-MORB SIGNATURE: OPHIOLITIC REMNANTS OF THE RHYACIAN-OROSIRIAN OROGENY IN SOUTHERN SÃO FRANCISCO CRATON?

In the Southern São Francisco Craton near Itapecerica (Minas Gerais – Brazil) occurs a supracrustal succession of rocks, varying from bottom to top by quartzite, graphite schist, khondalitic paragneiss and banded iron formation whose protoliths are oceanic basin with ages in context Rhyacian-Orosirian orogeny. Amphibolite metaultramafic bodies occur associated this succession. Mineralogical textural features amphibolite allow suggesting gabbroic protolith metamorphosed granulite facies retrometamorphosed generate amphibolite. Geochemistry reveals tholeiitic affinity protolith, which has an E-MORB signature, associating rock setting. The association metaperidotite setting suggest transition gabbro ultramafic rocks typical ophiolite sequence. A possible suture zone Itapecerica/Claudio region formed collision between Divinopolis Campo Belo/Bonfim complexes during orogeny involving alongside Claudio Shear Zone forward Minas Basin is suggestive geological investigated region.