6.2.1 Conclusões
Os experimentos que simularam duas fases de extensão separadas pela deposição de uma sequência pós-rifte, esta, intercalada por uma camada de silicone, e nos quais se variou apenas a magnitude da distensão, permitiram concluir que a crescente magnitude de reativação:
1) Gerou nas sequências do pré-silicone
i) apesar do forte controle estrutural da primeira fase de extensão (de 17 % ou 6 cm) sobre a segunda, uma nova arquitetura estrutural (duas bacias marginais interpostas por um horst central), nos experimentos de elevada magnitude de reativação (de 33% e 66 %).
2) Causou no pós-silicone, da sequência pós-rifte:
ii) a partir de 1,0 cm (16,6%) de reativação (BR3), uma escassa deformação rúptil associada a uma sutil subsidência;
iii) a partir de uma reativação de 2,0 cm (33,3%) (BR4), uma deformação rúptil significativa e arqueamentos, isto é, bacias marginais e dobras forçadas; as dobras forçadas constituem monoclinais amplos na região central da bacia (sobre os flancos do horst) e estreitos na região sobre as falhas de borda;
iv) uma deformação rúptil localizada no domínio das falhas de borda da bacia e distribuída na região central;
v) forte movimentação do silicone, produzindo ‘salt’welds (cicatrizes de sal) e ‘salt’ diapirs (diápiros de sal).
Ao final, concluiu-se ainda que:
i) quando a magnitude da primeira fase de extensão é expressiva (pelo menos 17 % ou 6 cm), a posição estratigráfica do silicone, na sequência sin- ou pós-rifte, causa estilos estruturais diferentes;
Sugere-se: a) que isto acontece, porque o peso (a tensão normal) do pacote pós-rifte modifica a arquitetura estrutural da bacia; e b) que, caso em um modelo, igual ao BR6, a magnitude de extensão da segunda fase, tivesse sido maior, a arquitetura final teria sido parecido com o dos modelos BR4 e
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ii) na região central da bacia, uma alta magnitude de extensão causa uma deformação acoplada entre as sequencias pré- e pós-silicone (mais falhada e mais dobrada), confirmando modelagens prévias;
iii) considerando-se a bacia inteira, a deformação será acoplada ou desacoplada dependendo da espessura do pós-silicone;
iv) a analogia com exemplos de bacias naturais confirmou os resultados experimentais e corroborou as interpretações.
A utilização de ferramentas de modelagem tridimensional se mostrou um recurso poderoso para visualização de modelos físicos análogos, com um grande potencial para extração de parâmetros estruturais quantitativos que possam vir a suportar modelos reais na indústria.
Deve-se também salientar que o grande valor da modelagem na mecânica dos materiais não fica restrito apenas à produção de modelos em si, mas também, na possibilidade de investigar conceitos, validar hipóteses e principalmente estimular a imaginação do modelador.
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ANEXOS
Data: JAN/2016 Laboratório: CENPES
Rifte simétrico de direção Norte-Sul em relação as placas. Reativação extensional
Dimensões da Caixa 35,0 x 40,0 cm Velocidade Motores 2,0 cm/h Espessura Rifte 3,0 cm Espessura Pós-Rifte 1,0 cm