oa Flexural Rigidity at Parnaíba Basin - Brazil

The intracratonic Parnaibá basin, located in Northeast Brazil, covers an area of approximately 600,000 km2. It is surrounded by Brazilian cycle (700-500 Ma) orogenic belts and its sedimentary cover ranges in age from Silurian to Cretaceous. These sequences have been intruded by volcanic rocks of Early Jurassic and Early Cretaceous ages. The maximum sedimentary thickness is around 3500 metres, based on surface geology, geochemical surveys, exploratory wells and seismic sections (Góes et al, 1993).