Estudo da espécie Curatella americana L. (lixeira) utilizada como agente bioindicador em região aurifera do Distrito de Cangas em Poconé/MT

• Ano de defesa: 2012
• Autor(a) principal: Marques, Raélita de Oliveira Resende
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Mato Grosso; Brasil; Instituto de Ciências Exatas e da Terra (ICET); UFMT CUC - Cuiabá; Programa de Pós-Graduação em Geociências
• Palavras-chave em Português: Curatella americana L.; Biogeoquímica; Ouro; CNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS; Biogeochemistry; Gold; Biogéochimie; Or
• Link de acesso: http://ri.ufmt.br/handle/1/1823

ABSTRACT: This research used the plant Curatella americana L., in pursuit of providing the determination of areas of occurrence of gold concentration in primary or secondary deposits without excavations, and use only a native plant as a agent bioindicator. Aimed to detect the presence of gold in the leaves of this plant and use it as a biological identifier of this precious metal. The plant is popularly known as trash, and their predominant occurrence in the areas of the Brazilian cerrado. Had the use of leaves in the biogeochemistry prove to be an interesting and efficient tool to prove the likelihood that the region does have a gold and as the plant moves away from the deposits of this metal also decreases the amount detected. The study area known as Baixada Cuiabana host gold deposits associated with quartz veins, located near the District of Cangas, Poconé, Mato Grosso, Brazil. We chose eighteen points of collection of leaves of the plant in the study that established a regular grid sampling near areas of mining of miner San Rafael, where results were obtained by burning the samples at 450 °C for loss of organic matter and submitted to the analytical technique used for ICP-EAS determination of gold and associated metals. The results showed a strong relationship exists between the metal levels found in the leaves and trash generated by anomalous concentrations of these elements marked in mined areas.