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NOVAS OCORRÊNCIAS DE URÂNIO NA REGIÃO DE LAGOA REAL, A PARTIR DA SUPERPOSIÇÃO DE DADOS GEOFÍSICOS, GEOLÓGICOS E DE SENSORIAMENTO REMOTO

2003; Sociedade Brasileira de Geologia; Volume: 33; Issue: 2 Linguagem: Inglês

10.25249/0375-7536.200333s29198

ISSN

2177-4382

Autores

Elisabete Maria Pascholati, CLAUZIONOR LIMA DA SILVA, Solange dos Santos Costa, LILIANA SAYURI OSAKO, Gilberto Amaral, Ingrid Padilla Rodríguez,

Tópico(s)

Geochemistry and Elemental Analysis

Resumo

The origin and control of Uranium occurrences and deposits at the Uraniferous District of Lagoa Real, State of Bahia (Brazil), has been largely studied over the last decades. Currently, the deposit controls are bounded to albitites in the Granite-Gneissic Complex at the center-south area of Lagoa Real. Data from the São Timóteo Airborne Geophysical Project have been analyzed and superimposed to geological, geophysical and remote sensing data in order to identify new occurrences of Uranium for prospection. Reappraisal of the gammaspectrometric data (K, U e Th) shows that distinctive litotypes indicate some radiometric anomalies in the northeast area. The magnetometric data suggest the existence of depth-rooted magnetic blocks separated by shear zones recognized by the Landsat-5TM’s image. The combination of these products with the geological information shows a structural evolution not previously described in literature. The kinematics of the shear zones with NS, NE-SW and NE-SW directions was established based on bodies´ displacement and magnetic features. The ductile-ruptile, ruptileductile and ruptile structures are compatible with the geological framework of the São Francisco Craton during the Brazilian Cicle: East-West convergence with West mass transport. The continuing deformation produced dextral and sinistral shear zones that resulted in the inflection of the pre-existent foliation. The well-known Uranium deposits are located in the N-S shear zones; the new occurrences, located in the northeastern area, are associated with the NW-SE shear zones and they introduce new targets for prospection.

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