316 BRAZIL 1800 Ma, a 1750 Ma ensialic rift assemblage, Neoproterozoic passive margin to foreland strata, and other correlative units The crystalline core, dominated by an array of north-north-east–south-south-west-striking dextral transpressional zones, comprises a Palaeoproterozoic basement, amphibolite or granulite facies Neoproterozoic sedimentary units, and a batholithic body of Brasiliano granites (625–530 Ma) The Arac¸ uaı´–West Congo Orogen is currently viewed as the product of the closure of a Red Sea type ocean, whose development started with rift formation in the Tonian between 900 Ma and 800 Ma Figure 11 Locations of the most important Brazilian Phanerozoic sedimentary basins Maps and isopachytes (in metres) of Palaeozoic sags, modified from Milani E and Thomaz Filho A (2000) Sedimentary basins of South America In: Cordani UG, Milani EJ, Thomaz FA, Campos DA (eds.) Tectonic Evolution of South America, pp 389 449 31st International Geological Congress, Rio de Janeiro Offshore Bouguer anomaly map from Mohriak (2003) Rift architecture and salt tectonics in South Atlantic sedimentary basins In: Mohriak WU Rifted Sedimentary Basins of South Atlantic: Turbidite Reservoirs, Sedimentary and Tectonic Processes 41st Brazilian Geological Congress and 1st International Conference of the Geophysical Society of Angola, Short Course Notes, CD ROM, Socıedade Brasiliera de Geologı` a, Joao Pessoa, Brazil