| Texto completo | |
| Autor(es): |
Faleiros, F. M.
;
Campanha, G. A. C.
;
Pavan, M.
;
Almeida, V. V.
;
Rodrigues, S. W. O.
;
Araujo, B. P.
Número total de Autores: 6
|
| Tipo de documento: | Artigo Científico |
| Fonte: | JOURNAL OF STRUCTURAL GEOLOGY; v. 93, p. 106-130, DEC 2016. |
| Citações Web of Science: | 7 |
| Resumo | |
The Ribeira Belt (Brazil) is a Neoproterozoic collisional-related feature that was located in a south-central position in West Gondwana. We present quantitative data on finite strain, flow vorticity and deformation temperatures for the Curitiba Terrane, a major segment of the southern Ribeira Belt. Six deformation phases (D-1-D-6) related with crustal thickening and exhumation were recognized. D-1 and D-2-related microstructures are preserved exclusively within porphyroblasts, in part grown during stages of high-pressure (similar to 9-12 kbar) isobaric heating after crustal thickening. D3 phase was active from peak metamorphism attained in contrasting crustal levels (810-400 degrees C), to the early stage of exhumation (500-400 degrees C), as indicated by petrological, microstructural and quartz c-axis fabric evidence. Kinematic vorticity results indicate that the SL3 mylonitic fabric resulted from a simple shear-dominated deformation related with westward thrusting. North-verging overturned D-4 folds with E-W-trending sub horizontal axes derived from a pure shear-dominated deformation. Regional 133 open folds with subvertical axes and NNE-SSW-trending traces were produced by indentation tectonics. D-6 phase comprises retrograde orogen-parallel transcurrent shear zones related with scape tectonics. Geochronological data indicate that D-3-D-6 phases occurred between 584 and 580 Ma, suggesting a fast exhumation rate of similar to 8 mm/year for the deepest rocks from the southern Ribeira Belt. (C) 2016 Elsevier Ltd. All rights reserved. (AU) | |
| Processo FAPESP: | 02/13654-4 - Caracterização de terrenos tectono-metamórficos no extremo Sul do estado de São Paulo |
| Beneficiário: | Frederico Meira Faleiros |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 15/04487-7 - Metamorfismo e evolução tectônica do Cinturão Ribeira meridional: relações entre os terrenos Embu, Apiaí e Curitiba |
| Beneficiário: | Frederico Meira Faleiros |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |