New LA-ICP-MS U-Pb zircon dating, 40Ar-39Ar and Sm-Nd model ages: evidence of the Grenvillian event in the basement of the Falcón and Maracaibo Basins, northwestern Venezuela - Baquero, Marvin; Grande, Sebastián; Urbani, Franco; Cordani, Umberto G.; Sato, Kei; Shaaf, Peter; Hall, Chris; Mendi, David; Azancot, Manuel (Congreso Latinoamericano de Geología, 2011)