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Mineralogical indicators of Acid rock drainage (ARD) in road cuts from different lithostratigraphic units

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Resumo:Construction of highways in some particular geological conditions exposes pyrite and other associated sulfides to oxidative weathering. This generates a process known as acid rock drainage. As a consequence, typical properties of acid drainage may develop, such as precipitation of soluble salts efflorescences. Also, acidic and metal-rich runoff from the exposed road cuts may pose concerns about the surface and groundwater contamination as well as regarding the structural robustness and the safety of the road slopes. In the North of Portugal, particularly in the Minho region there are geological conditions that promote the development of natural acidic and metal contamination. Such acid rock drainage appears as an exuberant phenomenon in several highway cuts, where the sulfide-rich exposed rocks are suffering oxidation. The present work reveals the occurrence of acid rock drainage sites in road cuts in the north of Portugal, relating this process with the geology of the terrains. Thus, it describes the sources of acid and metals and the respective genesis conditions, and presents the mineralogical indicators of such a geochemical process, which are dominated by magnesium sulfates. Moreover, remediation measures are pointed out, some of them already implemented in some sites.
Autores principais:Valente, Teresa Maria Fernandes
Outros Autores:Pamplona, J.; Gomes, P.; Rios, C. A.
Assunto:Acid rock drainage ARD Road cuts Salt efflorescences Water contamination Drenagem ácida Cortes de estrada Eflorescências salinas Contaminação
Ano:2018
País:Portugal
Tipo de documento:comunicação em conferência
Tipo de acesso:acesso aberto
Instituição associada:Universidade do Minho
Idioma:inglês
Origem:RepositóriUM - Universidade do Minho

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