Carlos José Archanjo

• Abstract

  Contrasting tectonic models have been proposed for the evolution of the basement of the Parnaíba Basin (PI-CE). Based on gravimetric and seismic data, one model proposes that the basement accommodated rifting processes succeeded by thermal subsidence, whereas alternative models stand that the Parnaíba Basin evolved mostly by lithospheric flexure induced by a dense lower crust. The distinc…

  Cooling ages and tectonics of the Ceará Central (Borborema Province, NE Brazil), AP.R
• Syn- to post-tectonic granite magmatism of the Apiaí Domain (Ribeira Belt) and implications for the Brasiliano crustal deformation in the southwest of the São Paulo state, AP.R
• Ams and grain shape fabric of the late paleozoic diamictites of southeastern parana basin, brazil., AR.BR

(Only some records are available in English at this moment)

• Abstract

  Amongst the most significant tectonic features of the Borborema Province (NE Brazil) are the widespread transcurrent shear systems and expressive granitic magmatism. The chronological record between the magmatism and deformation mechanisms is only locally known. In the state of Ceará two regional scale shear zones, Senador Pompeu and Tauá, deform the crystalline basement and give rise, in…

  Deformation and chronology of the granitic magmatism associated with the Tauá and Senador Pompeu shear zones (Borborema Province, NE, Brazil), BP.DD

• Abstract

  The Pernambuco shear zone, one of the main structures of the Borborema Province, consists of two sheared branches in which high- to low-temperature mylonites are deformed in distinct ways: the western branch involves partial melting and coarse-grained amphibolite facies mylonites, while the eastern branch was developed in the vicinities of two granitic batholiths. In the eastern branch, m…

  Strain localization in the Pernambuco shear zone (Borborema Province, NE Brazil): Implications for the rheology of the continental crust, BP.PD
• Magma emplacement in a convergent margin: emplacement mechanisms and petrogenesis of a Meso-Cenozoic arc in the central cordillera of the Colombian Andes, BP.DD

(Only some records are available in English at this moment)

• Abstract

  Shear zones are important to processes of continental deformation during orogenesis and often determine the bulk strength of the lithosphere. The localization of deformation within shear zones produce specific rock deformation microstructures which result from activation of different mechanisms that accomodate plastic strain. The shear zones in the northern Borborema Province, subject of …

  Electron Backscatter Diffraction (EBSD) analysis of deformation microstructures - Constraining rheology and deformation conditions of northern Borborema Province (NE Brazil), BE.EP.DD

• Abstract

  The Colombian Andes consist of Permo-Triassic to Cretaceous magmatic belts accreted to the South America continental plate. These belts were formed during the subduction of the oceanic Pacific and Caribbean lithospheres combining periods of extension and emplacement of magmatic rocks, and compression (accretion) followed by inversion of sedimentary basins and deformation of the plutonic r…

  Magnetic fabric of diorites and tonalites emplaced in subduction zones (Central Cordillera, Colombia), BE.PQ

• Abstract

  The Pernambuco shear zone, one of the main structures of the Borborema Province, consists of two sheared branches in which high- to low-temperature mylonites are deformed in distinct ways: the western branch involves partial melting and coarse-grained amphibolite facies mylonites, while the eastern branch was developed in the vicinities of two granitic batholiths. In the eastern branch, m…

  Strain localization at the frictional-viscous transition in the middle crust: examples from the Pernambuco shear zone (Borborema Province, NE Brazil), BE.EP.PD

(Only some records are available in English at this moment)