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Master's Dissertation
DOI
10.11606/D.44.1990.tde-19062015-152233
Document
Author
Full name
Elvo Fassbinder
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 1990
Supervisor
Committee
Sadowski, Georg Robert (President)
Fiori, Alberto Pio
Silva, Marcos Egydio da
Title in Portuguese
Análise estrutural da falha da Lancinha, Estado do Paraná
Keywords in Portuguese
Geologia Estrutural
Abstract in Portuguese
A estruturação do Lineamento Além Paraíba-Cubatão Lancinha ocorreu em dois eventos distintos: Cubatão e Lancinha. O Evento Transcorrente Cubatão, atuante em rochas gnáissicas, mostra a presença de rochas miloniticas e blastomiloniticas, com metamorfismo da fácies anfibolito e deformações essencialmente dúcteis associadas. A reativação de antigos planos de fraqueza gerados no Evento Cubatão, levaram à deformação dos metassedimentos Açungui sobrepostos, com a instalação de estruturas secundárias previstas no Modelo de Riedel, como dobras escalonadas, falhas sintéticas e antitéticas, além de fraturas do tipo Y (D), X e T. Associam-se a estas estruturas um generalizado fraturamento e esporádicas brechas, além de lenticularizações e constricções de camadas litológicas. Estas deformações geradas no nível estrutural médio, caracterizam o Evento Transcorrente Lancinha. A presença de esforços transpressionais alçaram o Núcleo Betara, e expuseram cisalhamentos transcorrentes dúcteis, rupteis-ducteis, alem de deformações rupteis. Além disso, estes esforços NW-W/SE-E formaram estruturas do tipo " duplex de Riedel". A formação Camarinha foi deformada por nova reativação deste mega lineamento, estirando seixos do seu fácies conglomerático, com valores de Rs=1.8-2.0. Diversas reativações tiveram lugar durante o Fanerozoico, até movimentos suaves que parecem estar presente nos dias atuais.
Title in English
Not available
Keywords in English
Not available.
Abstract in English
Two distinct events (Cubatão and Lancinha) were recognized to have taken place for the structural installation of the Além Paraíba-Cubatão-Lancinha lineament. The Cubatão strike-slip fault affected gnaissis rocks, producing mylonites and blastomylonites, associated with amphybolite facies metamorphism and essentially ductile deformation along its strike. The overlying Açungui metassediments were deformed due to reactivation of earlier weakness planes originated at the Cubatão event. Several secondary structures, such as en échelon folds, synthetic and antithetic faults, Y (D), X and T fractures were simultaneously develloped, in accordance with Riedel's Model. Generalized fracturing and rather few brecciation, along with lenticularization and constriction of some beds are associated phenomena. These deformations all were produced at intermediate crustal level and are due to the Lancinha strike-slip event. Ductile and brittle-ductile transcurrent shears, beside brittle deformations, were exposed where transpressional stresses succeded to cut across the core gneisses of the structure known as Núcleo do Betara. NW-W/SE-E oriented stresses also led to Riedel's duplex structures. Deformation of the Camarinha Formation was caused by a new reactivation of this mega shear zone. Pebble elongation measurements performed in the conglomeratic facies of this sequence indicated values of Rs=1.8-2.0. Several reactivations also took place during Phanerozoic time and gentle movements seen to be notiable in present times.
 
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Publishing Date
2015-06-22
 
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