Advanced search
Start date
Betweenand

The Paraná Magmatic Province: petrogenesis, chronology and environmental impact of Cretaceous tholeiitic, alkaline and silicic magmatism in the Brazilian Platform

Grant number: 19/22084-8
Support type:Research Projects - Thematic Grants
Duration: July 01, 2020 - June 30, 2025
Field of knowledge:Physical Sciences and Mathematics - Geosciences - Geology
Principal researcher:Valdecir de Assis Janasi
Grantee:Valdecir de Assis Janasi
Home Institution: Instituto de Geociências (IGC). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Principal researchers:Excelso Ruberti ; Silvio Roberto Farias Vlach ; Silvio Roberto Farias Vlach
Assoc. researchers:Adriana Alves ; Alexandre França Velo ; Amélia João Fernandes ; André Pires Negrão ; Brenda Chung da Rocha ; Breno Leitão Waichel ; Carlos Henrique de Mesquita ; Celso de Barros Gomes ; Graham Pearson ; Daniele Giordano ; Edgardo Canón Tapia ; Eleonora Maria Gouvêa Vasconcellos ; Elisa Soares Rocha Barbosa ; Evandro Fernandes de Lima ; Fabio Ramos Dias de Andrade ; Fernanda Gervasoni ; Francisco de Assis Cavallaro ; Francisco de Assis Negri ; Gaston Eduardo Enrich Rojas ; Guilherme Mallmann ; João Francisco Trencher Martins ; Luana Moreira Florisbal ; Lucas de Magalhaes May Rossetti ; Margarida Mizue Hamada ; Maria Helena Bezerra Maia de Hollanda ; Maria Irene Bartolomeu Raposo ; Maria Zélia Aguiar de Sousa ; Matheus Silva Simões ; Miguel Angelo Stipp Basei ; Pedro Augusto da Silva Rosa ; Pedro Filipe de Oliveira Cordeiro ; Rogério Guitarrari Azzone ; Ticiano José Saraiva dos Santos ; Urs Schaltegger ; Vidya Vieira de Almeida ; Vinicius Hector Abud Louro ; Yára Regina Marangoni
Associated grant(s):20/11359-3 - Multi-user Equipment approved in grant 2019/22084-8:laser-ablation system to be coupled to an ICPMS, AP.EMU
Associated scholarship(s):21/01886-9 - Palynology analyses of sedimentary and volcanoclastic rocks associated to Serra Geral Group, BP.PD

Abstract

The reactivation of the Brazilian Platform during the Mesozoic influenced strongly the geological configuration of the south and southeast of Brazil, resulting in the opening of the South Atlantic and the generation of the marginal basins that host important volumes of hydrocarbon deposits.One of the major manifestations of this reactivation is the expressive magmatism of Cretaceous age, recorded both in the marginal basins and in the continent, where are exposed the second largest continental basaltic province of Planet Earth (the Paraná Magmatic Province), and, bordering the whole province, one of the worldwide most expressive and diversified associations of alkaline-carbonatite-kimberlite, to which important mineral deposits are related. Silicic volcanic rocks (dacites-rhyolites), although volumetrically subordinated, have singular characteristics, which arouse the interest of the international community, especially as to their eruptive styles.This project deepens the experience accumulated in the last five years, in which some of the most active research groups in the study of the Mesozoic magmatism of S-SE do Brasil, based in several Universities and Research Institutes, have been working in association to integrate petrological, volcanological and geochronological studies on the Province. Two main focuses, strongly interconnected, are proposed. In the study of volcanism, the main objectives are the establishment of an integrated stratigraphic column for the whole province (with the recognition of formal stratigraphic units), the precise determination of the age and duration of volcanism (through high precision geochronology by U), the identification of the eruptive styles of silicic and basaltic magmatism (combining field structural surveys and experimental petrology) and the evaluation of possible environmental impacts (adding to previous studies the quantitative study of volatile contents and emissions). In the study of associated plutonism, the emphasis will be on the petrogenesis of alkaline and tholeiitic magmatism (with the identification of mantle sources and their regional zonality, and the characterization and quantification of crustal evolution processes in closed and open systems) and the geochronology of alkaline magmatism, which extended for a much longer period than the tholeiitic magmatism, thus bringing fundamental information on events previous, contemporaneous and subsequent to the opening of the South Atlantic. (AU)