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The Espinhaco Supergroup cropping out between the cities of Macaubas and Canatiba, in the northernEspinhaco range, Bahia, is composed by the Pajeu Group (metarhythmites and intermediate to acidmetavolcanics), the Bom Retiro Formation (mature quartzites with metric to decametric cross-bedding), theSao Marcos Group (quartzites with wavy stratification and wave-related cross-bedding, intercalated with micaschists)and the Sitio Novo Group (cross-bedded, conglomeratic and massive quartzites, metarhythmites andmetapelites). The bedrock (gneisses and schists) is tectonically emplaced over the Espinhaco Supergroup inthe eastern portion of the area, and the Espinhaco Supergroup is unconformably covered by the Santo OnofreGroup (graphite-phyllites and metarhythmites) in the western portion of the area. This whole stratigraphicpackage is inverted, allowing, together with relations between bedding and schistosity, to define a largeinverted limb of an assymmetric fold with axis NNW-SSE.In the Veredas Formation, intermediate portion of the Sitio Novo Group, occurs a bed of approximately10 m of deep blue dumortierite-quartzites, used as ornamental rocks. Samples of these rocks have beenanalysed using optic, cathodoluminescence and electronic microscopic techniques, revealing its mineralogicand micromorphologic features.Comparing the stratigraphic and sedimentologic features of the studied area with other outcropping areas ofthe Espinhaco Supergroup, it can be concluded that it has evolved through three sedimentary megacycles,represented on each of the portions of the Espinhaco Range and Diamantina Plateau in the eastern regionof Brazil. The first megacycle involves syn-rift sedimentation, starting at about 1,75 Ga (Statherian Period).The second megacycle involves fundamentally eolian sedimentation. The third megacycle involves mainlyshallow marine to transitional sedimentation, with important tectonic reativation in the northern sector ofthe basin. All megacycles evolded in intracratonic environment..

A GEOLOGIA ENTRE MACAÚBAS E CANATIBA (BAHIA) E A EVOLUÇÃO DO SUPERGRUPO ESPINHAÇO NO BRASIL ORIENTAL