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| Transbrasiliano Lineament | |
|---|---|
| Name | Transbrasiliano Lineament |
| Type | Longitudinal shear zone |
| Location | South America, Africa (implied extension) |
| Length km | ~3000 |
| Age | Neoproterozoic to Paleozoic (reactivations) |
| Strike | NW–SE |
Transbrasiliano Lineament
The Transbrasiliano Lineament is a major continental-scale shear zone and crustal discontinuity traversing eastern and central South America, with inferred extensions toward Africa. It is a key structure in interpretations of the West Gondwana assembly, Brasiliano orogeny, and correlations with African sutures such as the Trans-Saharan Belt and West Congo Belt. The lineament influences continental-scale transport, magmatism, and mineralization across provinces including the São Francisco Craton, Borborema Province, and Paraná Basin.
The Transbrasiliano Lineament is recognized as a roughly NW–SE trending lithospheric scale lineation cutting through the São Francisco Craton, Congo Craton correlations, and crossing or bordering provinces including the Araçuaí Orogen, Mantiqueira Province, Uberaba Domain, and the Bororo Domain. Mapping integrates data from field geology, structural analysis, aeromagnetic surveys, and seismic reflection studies linked to regional syntheses like those by the Brazilian Geological Survey (CPRM), the United States Geological Survey, and academic groups at institutions such as Universidade de São Paulo, Universidade Federal de Pernambuco, and Universidade Federal de Ouro Preto. Interpretations connect it to plate reconstructions involving the Río de la Plata Craton, São Luís Craton, and African counterparts like the Taoudeni Basin and Gabon Shield.
The lineament transects varied lithologies including Archean to Paleoproterozoic gneisses of the São Francisco Craton, Neoproterozoic metasediments of the Araçuaí belt, and Phanerozoic cover of the Paraná Basin. It juxtaposes terranes such as the Juiz de Fora Complex, Itacolomi Group, and the Morro do Pilar Complex along contacts with the Espinhaço Supergroup and intrusions of the Cabo Frio Suite and Rio Doce Suite. Regional metamorphism and magmatism tied to the Brasiliano/Pan-African orogenies imparted granitoid assemblages comparable to those in the West African Craton and Kibaran Belt records. Sedimentary basins like the Bauru Group and igneous provinces including the Paraná-Etendeka flood basalts overlie or abut the lineament in places.
Structurally, the Transbrasiliano manifests as a system of strike-slip shear zones, brittle-ductile fault segments, and transcurrent corridors with splays such as the Pajeú Shear Zone and Salto da Divisa Fault. Kinematic indicators include mylonites, S-C fabrics, and asymmetric folds akin to structures recorded in the Damara Belt and Namaqua-Natal Belt. Cross-cutting relationships with granitic plutons like the Itabira Suite record multiple reactivation events linked to far-field stresses from continental collisions exemplified by the Pan-African Orogeny and later intraplate tectonics associated with the opening of the South Atlantic Ocean and Atlantic Ocean rifting processes.
Dating from U–Pb zircon geochronology, Rb–Sr, and Ar–Ar studies indicates Neoproterozoic emplacement and stabilization followed by Paleozoic reactivation; isotopic ages correlate with the timing of the Brasiliano orogeny, ca. 650–500 Ma. Detrital zircon provenance ties to sources comparable to the Amazonian Craton and West African Craton with signatures matching reconstructions of Rodinia breakup and subsequent Gondwana amalgamation. Tectonic models invoke suturing between blocks equivalent to the Sao Luis Craton and African counterparts during closure of oceans analogous to the Adamastor Ocean, followed by transtensional and transpressional regimes during continental escape driven by mantle dynamics including plume events related to CAMP-scale magmatism and the later Paraná-Etendeka episode.
The lineament localizes mineral systems including orogenic gold deposits similar to those in the Greenstone Belts and hydrothermal base metal occurrences comparable to deposits in the Kibara Belt. Mineralization is hosted in shear zones, quartz veins, and adjacent brittle-fracture networks, with known occurrences near mining districts like Itabira, Ouro Preto, and occurrences in the Carajás Mineral Province-related terranes. Exploration integrates geochemical surveys, induced polarization, and gravity studies used by companies such as Vale S.A., Anglo American plc, and junior explorers, along with academic research into metallogenic models paralleling those of the Volta Basin and Murchison Region.
Geophysical imaging including aeromagnetic, gravity, magnetotelluric, and deep seismic reflection profiles has delineated the lineament’s crustal-scale fabric and lateral continuity akin to signatures identified across the East African Rift and Caledonian Belt. Satellite remote sensing from platforms like Landsat, ASTER, and Sentinel-2 combined with digital elevation models (DEMs) and spectral mapping highlights linear geomorphic features, lineaments, and alteration zones comparable to remote analyses of the North China Craton and Scandinavian Shield. Integrative geophysical interpretations contribute to continental reconstructions developed in collaborations with organizations such as the International Union of Geological Sciences and research consortia at Geological Survey of Canada-linked initiatives.
As a first-order crustal structure, the Transbrasiliano Lineament is pivotal for regional tectonic synthesis, paleogeographic reconstructions, and correlations between South American and African Neoproterozoic belts including the Pan-African orogen and Mauritanide Belt. It is invoked in models of intracontinental deformation that connect to the evolution of the Río de la Plata Craton, Amazonian Craton, and African shields such as the Sao Francisco Craton-to-West African Craton linkages. Its study informs resource potential, seismic hazard assessment, and geodynamic models that parallel investigations of other major shear zones like the Alpine Fault and the San Andreas Fault.
Category:Geology of Brazil Category:Shear zones Category:Neoproterozoic geology