Electron microprobe dating of monazite from high-T shear zones in the São José de Campestre Massif, NE Brazil

Experimental anatexis, fluorine geochemistry and lead-isotope constraints on granite petrogenesis in the Seridó Belt, Borborema Province, northeastern Brazil

“…The eastern side of the Seridó Belt consists of the São José do Campestre cratonic fragment (3.4-2.7 Ga). It is composed of quartz dioritic to granodioritic, tonalitic, and granitic orthogneisses with minor exposures of garnet-cordierite-sillimanite-bearing paragneiss, marble, and banded iron formations (Dantas et al, 2004(Dantas et al, , 2013Souza et al, 2006).…”

Timing of the HT/LP transpression in the Neoproterozoic Seridó Belt (Borborema Province, Brazil): Constraints from UPb (SHRIMP) geochronology and implications for the connections between NE Brazil and West Africa

“…The HT-metamorphism and melting of the basement dated between 578 and 574 Ma have also been described to the east of the Seridó belt. These ages were recorded by Sm-Nd on garnet-whole rock from a granitic leucossome and on garnet bearing alkaline granites emplaced in an extensional setting (Souza et al, 2006). SHRIMP U\Pb concordia ages between 597 and 591 Ma were given by, respectively, the mafic and felsic intrusions that constitute the Totoró pluton.…”

Plates Amalgamation and Plate Destruction, the Western Gondwana History

“…Tentative correlation of NE-Brazil with its African counterpart (Caby, 1989;Trompette, 1994) shows a good structural fit between the Cearà-type and the Western Nigeria schist belts (Isseyin and Ife), in the one hand, and between the Sergipano and the Yaoundé-Oubanguide Groups, in the other hand; the Patos and Central Cameroon SZ are recognized as structural equivalents (Neves & Mariano, 1999), whereas the Cearà-type SZ are correlated with the trans-Saharan SZ (Caby, 1989). In Brazil, these shear zones are associated to early and latetectonic transcurrent plutons which ages are bracketed between 600-580 Ma, and 575-565 Ma, respectively (Neves et al, 2004;Souza et al, 2006); both age groups may be correlated with the sinistral and dextral shear evolutions in the Cameroon domain. However, NE-SW sinistral shear zones and respective NS synthetics in northern Cameroon have no equivalent in NE-Brazil.…”