Upper mantle viscosity and dynamic subsidence of curved continental margins

Autor(es)

Sacek, Victor ^[1] ; Ussami, Naomi ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, BR-05508090 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: NATURE COMMUNICATIONS; v. 4, JUN 2013.
• Citações Web of Science: 1

Resumo

Continental rifting does not always follow a straight line. Nevertheless, little attention has been given to the influence of rifting curvature in the evolution of extended margins. Here, using a three-dimensional model to simulate mantle dynamics, we demonstrate that the curvature of rifting along a margin also controls post-rift basin subsidence. Our results indicate that a concave-oceanward margin subsides faster than a convex margin does during the post-rift phase. This dynamic subsidence of curved margins is a result of lateral thermal conduction and mantle convection. Furthermore, the differential subsidence is strongly dependent on the viscosity structure. As a natural example, we analyse the post-rift stratigraphic evolution of the Santos Basin, southeastern Brazil. The differential dynamic subsidence of this margin is only possible if the viscosity of the upper mantle is >2-3 x 10(19) Pa s. (AU)

• Processo FAPESP: 09/50493-8 - Modelos da crosta e litosfera sob as bacias do Paraná e Chaco-Paraná integrando gradiometria gravimétrica por satélite, gravimetria terrestre e sondagens magnéticas e eletromagnéticas
• Beneficiário: Icaro Vitorello
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 11/10400-0 - Evolução tectônica, climática e erosional em margens convergentes: uma abordagem numérica
• Beneficiário: Victor Sacek
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado