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I n the rift-type Camamu Basin ideal models of mineral symmetry fabrics are compared with orientation patterns of the: (i) 201 planes of principal foliation (S P ) and 538 measures of stretching mineral lineation (L X ) in basement rocks, and (ii) 2,530 structural lineaments terrain digital model images and 12,421 planes of faults and fractures, obtained respectively from country rocks and basin sedimentary unities located close at the basin western border. In terms of structures are noted that: (i) the main fault/fracture sets are parallels to close parallels to N00 o -30 o -trending regional foliations (SP), and orthogonal N90 o , to diagonal N120 o to S P and L X , (ii) a combination between regional extension (E-W,NW-SE and NE-SW) and country rock mineral symmetry fabric orientations facilitated the N00 o - to 30 o -, N90 o - and N120 o -trend fault set formations, (iii) the N-S strike and subvertical E- and W-dips of the S P facilitated continental split associated to South Atlantic Mesozoic overture, and where S P were subhorizontals L X became a important option to “induce” fault propagation directions, so not only S P but a S P +L X combination was important to geometric construction of the fracturing fabric at the western border of the BC, and (iv) the lithospheric load release due thick crustal layer erosion that exposing granulite facies rocks could conduce to production of weakness planes and lines reactivated during rifting development. Is observed a combination of monoclinic-triclinic fracturing fabrics, more frequent, where S-C shear zone surfaces domain and/or there were polyphasic strain history, and (pseudo)orthorhombic fabric, less frequent, where S P and L X became subparallel under extreme mineral stretching and rotation. Both S P and L X parallel and orthogonal fault/fractures were generated during basin’s formation and evolution. This way not only the far-field stress orientations but the basement rocks mineral symmetry fabrics were crucial to the basement and Camamu Basin fracturing fabric constructions.

revista brasileira de geociências

Modelos de tramas de simetria mineral de rochas do embasamento cristalino aplicados ao padrão de fraturamento do embasamento e de bacias sedimentares do tipo rifte. A Bacia de Camamu, Bahia, Brasil