K–Ar and 40Ar/39Ar ages of dikes emplaced in the onshore basement of the Santos Basin, Resende area, SE Brazil: implications for the south Atlantic opening and Tertiary reactivation

Continental fossil vertebrates from the mid-Cretaceous (Albian–Cenomanian) Alcântara Formation, Brazil, and their relationship with contemporaneous faunas from North Africa

“…4, Table 2). Thus, the presence of closely related nonmarine vertebrate taxa in middle Cretaceous deposits of North Africa and Brazil (Sereno et al, 1996(Sereno et al, , 1998(Sereno et al, , 1999(Sereno et al, , 2004Forster, 1999;Candeiro et al, 2004Candeiro et al, , 2006Holtz et al, 2004;Wilson, 2006;Sereno and Brusatte, 2008; this study), as well as paleogeographic reconstructions, supports the hypothesis that a land route connecting the western Gondwanan landmasses may have persisted until the early Late Cretaceous, possibly in the equatorial region (Petri, 1987;Reyment and Dingle, 1987;Pitman et al, 1993;Pletsch et al, 2001;Tello Saenz et al, 2003;Guedes et al, 2005).…”

“…In the Early Cretaceous, isolated rift/ strike-slip basins provided intermittent shallow-water connections in relatively small and isolated basins, and during the Aptian-Albian a major rift phase led to deeper basins with restricted deep water circulation (Pletsch et al, 2001;Macdonald et al, 2003). No later than the early Cenomanian, a mature spreading stage allowed a continuous and permanent deep-water connection between the southern and northern Atlantic, interrupting possible terrestrial connections and faunal interchanges between South America and Africa (Petri, 1987;Reyment and Dingle, 1987;Pletsch et al, 2001;Tello Saenz et al, 2003;Guedes et al, 2005;Bodin et al, 2010).…”

Geochronology (Ar/Ar and K–Ar) of the South Atlantic post-break-up magmatism

“…in São Sebastião Island, Ubatuba, Búzios Island, Tijuca Massif, Paracambi, Petrópolis, Ponta Negra, Cabo Frio, Arraial do Cabo and Armação de Búzios). There are two distinct dyke orientations: N508E and N108W (Guedes et al 2005). Most of the dykes are oriented at approximately N508E.…”

“…Most of the Paraná flood basalts and their related dykes have compositions at the limit between basalt and andesite (Peate et al 1992;Guedes et al 2005). Among the dykes, most of them are the low-Ti type, but there are some present of the high-Ti type.…”

Brittle reactivation of mylonitic fabric and the origin of the Cenozoic Rio Santana Graben, southeastern Brazil

“…The first magmatic event in the Late Jurassic to Early Cretaceous formed diabase dikes. This event encompasses the Serra Geral Formation in the Paraná Basin (Almeida, 1983), the NE-trending swarm of tholeiitic basalt dikes 134-129 Ma, known as the Serra do Mar dike swarm (Deckart et al, 1998), and the 190-130 Ma dikes, known as Santos-Rio de Janeiro dike swarm (Guedes et al, 2005).…”