Geochronology and geochemistry of the meta-volcanic rocks from Riacho do Tigre complex, Borborema province - northeastern Brazil - Accioly, Ana Claudia de Aguiar; Santos, Carlos Alberto dos; Santos, Edilton Jose dos; Brito Neves, Benjamim Bley de; Rodrigues, Joseneusa Brilhante; McReath, Ian (South American Symposium on Isotope Geology, 2010)