Drill core structural analysis and extensional-contractional controls on the sulfide mineralization at the Ambrosia Sul zinc deposit, Vazante group, Western São Francisco craton, Brazil.
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2022
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The Ambrósia Sul Zn-(Pb) sulfide deposit is located in the southern section of the Vazante Group, which is the
border area between the Brasília belt and the southwestern edge of the São Francisco craton. This region is
characterized by a typical karst environment in a tropical climate that is commonly represented by the intense
development of thick and uneven soil cover, which hinders structural geologic mapping. A survey with oriented
core samples allowed a full structural investigation and description of structures such as faults, fractures, veins,
bedding, folds, foliations, and lineations. The structural analysis suggests an extensional phase with down block
in the west, during which normal faults and high-angle veins were generated, followed by a contractional phase
associated with the reactivation of bedding planes, the nucleation of reverse faults and low-angle veins, and east-
vergent folding. The zinc sulfide ore bodies are preferentially hosted in high-angle veins and in cataclastic rocks
generated during the extension. Low-angle veins, rarely mineralized with Zn, cut the high-angle veins, suggesting
that the mineralization event lasted even during the tectonic inversion phase. The regional context indicates that
the Ambrósia Sul deposit formed in the bulge region of the foreland basin and that it was affected first by an
extensional phase during its nucleation and subsequently by a compressive phase with the advancement of
thrusting in the Brasília belt to the east.
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Zinc mineralization, Mineral exploration, Core orientation
Citação
BOTURA NETO, B.; DANDERFER FILHO, A. Drill core structural analysis and extensional-contractional controls on the sulfide mineralization at the Ambrosia Sul zinc deposit, Vazante group, Western São Francisco craton, Brazil. Journal of Structural Geology, v. 154, artigo 104474, 2022. Disponível em: <https://www.sciencedirect.com/science/article/pii/S019181412100198X>. Acesso em: 29 abr. 2022.