Francisco de Assis Negri

TL;DR: Uranium-lead zircon ages between 660 and 640 Ma, obtained from a series of calc-alkaline orthogneisses and plutons in southeast Brazil's Central Mantiqueira Province, suggest that a significant period of magmatism occurred in this region prior to the collisional assembly of West Gondwana (presently constrained in the region between ca. 625 and 580 Ma) as discussed by the authors.

TL;DR: A succession of trachydacitic lava flows over 150 m thick constitutes the lowermost portion of the Serra Geral Fm as discussed by the authors along the Paranapanema River valley in the Piraju-Ourinhos region, State of Brazil.

TL;DR: A preliminary conceptual model of groundwater flow was developed for the Serra Geral fractured basalt aquifer in order to assess the recharge to the underlying sandstone Guarani Aquifer System, one of the main aquifer systems in Brazil, which supplies water to millions of people as discussed by the authors.

TL;DR: In this article, a maisespessa sucessão sedimentar, o Membro Macapa, is described as follows: "a sucesso de derrames basalticos with intercalacoes decamadas sedimentares".

TL;DR: In this paper, the authors used U Pb SHRIMP and Nd and Sr isotopic and geochemical investigations aiming to increase the knowledge of these juvenile crustal domains.