Morfologias de talude instável em contexto de rifting : exemplo do Jurássico Su...

• Autor(es): Reis, Rui Pena
• Data: 2003
• Identificador Persistente: http://hdl.handle.net/10400.9/975
• Origem: Repositório do LNEG
• Assunto(s): Estabilidade de taludes; Rifting; Carsificação; Turbidites; Jurássico superior; Bacia Lusitaniana (Portugal)
• Tipo de Documento: Documento de conferência
• Idioma: Português

Descrição

The second rifting episode of Lusitanian Basin reached a climax during Upper Jurassic. After a transgressive event in the Oxfordian, an intense tectonic subsidence lead to the definition of three sub-basins in the central region. In the Montejunto area, the edge of the rupture was studied. Different depositional geometries resulted from an interpreted fault, which boundes a platform realm to NE from a deep basin situation to SW. Turbidite facies, olistholits, debris-flow events and coarse sandy lobes of deep sedimentation are described. Karstification evidences are noted as well, resulting from the emersion of shelf faulted blocks, during the extensional faulting.