Metal anomaly prospection at cerrado. Example for the use of si-phytoliths at Riacho dos Machado region, Minas Gerais, Brazil

Autor: Fernandes-Horn, Heloiza Márcia, Horn, Adolf Heinrich, Sampaio, Regynaldo Arruda, Rodrigues, Marcio Neves, Duarte, Luana, Bilal, Essaïd, Baggio-Filho, Hernando, Claret Torres, Isabela
Přispěvatelé: Federal University of Minas Gerais (UFMG), Instituto de Ciências Agrárias, Universidade Federal de Minas Gerais, Environmental Geochemistry Laboratory, Universidade Federal de Minas Gerais [Belo Horizonte] (UFMG), Geology Department Geoscience Institute, École des Mines de Saint-Étienne (Mines Saint-Étienne MSE), Institut Mines-Télécom [Paris] (IMT), Université de Lyon, Centre National de la Recherche Scientifique (CNRS), Environnement Ville Société (EVS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-École nationale supérieure d'architecture de Lyon (ENSAL)-École des Mines de Saint-Étienne (Mines Saint-Étienne MSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-École Nationale des Travaux Publics de l'État (ENTPE)-Université Jean Monnet [Saint-Étienne] (UJM)-Université Jean Moulin - Lyon 3 (UJML), Université de Lyon-Université Lumière - Lyon 2 (UL2)-École normale supérieure - Lyon (ENS Lyon), Centre Sciences des Processus Industriels et Naturels (SPIN-ENSMSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Département Procédés pour l'Environnement et Géoressources (PEG-ENSMSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-École des Mines de Saint-Étienne (Mines Saint-Étienne MSE), Universidade Federal dos Vales do Jequitinhonha e Mucuri = Federal University of Jequitinhonha and Mucuri Vallays (UFJMV), Campus Juscelino Kubitschek, Geography Department, Geoscience Institute, Federal University of Minas Gerais - Instituto de Ciências Agrárias-Campus Avançado, Federal University of Minas Gerais - Environmental Geochemistry Laboratory Geology Department, Geoscience Institute, Federal University of Jequitinhonha and Mucuri Valleys - Campus Juscelino Kubitschek, Federal University of Minas Gerais - Geography Department, Geoscience Institute, Universidade Federal de Minas Gerais = Federal University of Minas Gerais [Belo Horizonte, Brazil] (UFMG), Environnement, Ville, Société (EVS), École normale supérieure de Lyon (ENS de Lyon)-École des Mines de Saint-Étienne (Mines Saint-Étienne MSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Université Lumière - Lyon 2 (UL2)-Université Jean Moulin - Lyon 3 (UJML), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Jean Monnet - Saint-Étienne (UJM)-École Nationale des Travaux Publics de l'État (ENTPE)-École nationale supérieure d'architecture de Lyon (ENSAL)-Centre National de la Recherche Scientifique (CNRS)
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Zdroj: Geochimica Brasiliensis
Geochimica Brasiliensis, Sociedade Brasileira de Geoquimica, 2018, 32 (1), pp.40-46. ⟨10.21715/GB2358-2812.2018321040⟩
Geochimica Brasiliensis, Vol 32, Iss 1, Pp 40-46 (2018)
Geochimica Brasiliensis, 2018, 32 (1), pp.40-46. ⟨10.21715/GB2358-2812.2018321040⟩
DOI: 10.21715/GB2358-2812.2018321040⟩
Popis: International audience; The target area of this work is a heavy metal anomaly in the surroundings of a gold mine and a lead mining complex. This work investigated the distribution of selected heavy elements in soil samples and Si-Phytoliths from plants. The aim was to verify if metal contents are indicative for metal anomalies in the soil. Plants and soil samples were collected in profiles over granitic-gneissic rocks, which form the basement, in tectonized contact with the overlaying sedimentary units belonging to the Riacho dos Machados Group, part of the Espinhaço Super Group. The whole rock substrate is covered by lateritic to arenitic soils with different exposure depths. Metal-rich fluid invaded these units, forming metal anomalies culming in Zn-Pb-Au deposits, like that of Salobre-Porteirinha. After appropriate preparation, the samples were, analyzed by ICP-OES (Si-Phytoliths) and FRX (soil). Anomalies in the investigated profile are indicated by high metal contents in the Si-Phytoliths of the selected species. Using different species the metal concentration in different depths can be determined in a simple and easy way. The Si-Phytolith concentrations seem to reproduce better the rock metal anomalies than the soil samples.; O alvo deste trabalho é uma anomalia de metais pesados nos arredores de uma mina de ouro em uma mineração de chumbo. Este estudo investigou a distribuição dos elementos pesados selecionados em amostras de solo e em Si-Fitólitos de plantas. O objetivo foi verificar se o conteúdo de metais nos Si-Fitólitos é indicativo para anomalias destes metal no solo ou substrato. Plantas e amostras de solo foram coletadas em perfis de solos sobre rochas gnáissicograníticas, que formam o embasamento e que estão em contato tectônico com as unidades sedimentares superiores, pertencentes ao Grupo Riacho dos Machados, parte do Supergrupo Espinhaço. O embasamento é coberto por solos lateríticos a areniticos, com profundidades de exposição diferente. Fluido rico em metal invadiu estas unidades, formando anomalias de metais que chegaram a depósitos econômicos de Pb-Zn-Au, como o de Salobre-Porteirinha e Riacho dos Machados. Após a preparação adequada, as amostras foram, analisadas por ICP-OES (amostras de Si-Phytoliths) e FRX (amostras de solo). Anomalias no perfil investigado são indicadas pelo alto conteúdo de metal na Si-Phytoliths das espécies selecionadas. A concentração de metal em diferentes profundidades usando diferentes espécies pode ser simples e fácilmente executada. As concentrações de Si-Phytolith parecem reproduzir melhor as anomalias metálicas do substrato de rocha do que as amostras de solo.
Databáze: OpenAIRE
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