Temporal and spatial hydrogeochemical evolution and lead isotopic composition of a contaminated stream of Taxco, Guerrero, Mexico
Por:
Quevedo-Castañón N.M., Talavera-Mendoza, Oscar, Salgado-Souto S.A., Ruiz, Joaquin, Dotor-Almazan, Azucena, Ramírez-Guzmán A.H., Sampedro-Rosas, Laura, Rosas-Acevedo J.L., Chávez-González J.D.
Publicada:
1 abr 2020
Categoría:
Geology
Resumen:
Discharge of Acid Mine Drainage (AMD) produced within flooded mines is a
major environmental issue in most polymetallic mining sites severely
impacting nearby natural resources and producing a serious menace to the
ecosystem and humans. The identification of both natural and
anthropological factors influencing the bio availability of toxic
elements is relevant in revealing their behavior but also in the design
of strategies for mitigating adverse effects to the environment. For
these purposes, we carried out a spatial and seasonal hydrogeochemical
(total and soluble contents) and a lead isotopic study of the AMD of the
Xochula stream in the mining region of Taxco, Guerrero, in southern
Mexico. The AMD is produced by the periodic discharge from the flooded
Guerrero mine to the Xochula stream and is characterized by low to
moderate pH, high sulfate, and high total and soluble metal contents.
The AMD shows significant spatial but smaller temporal variations. Flow
of AMD through a culvert made of concrete produces the most important
chemical changes recorded regardless of the time of year significantly
decreasing the electrical conductance and the concentration of total and
soluble potentially toxic elements. Distribution of metals and As
between dissolved and particulate-bound species is pH-controlled. Due to
the short interaction time between the AMD and bedrock and the formation
of coatings, lithology plays a minor role in neutralization, whereas
mixing of AMD with freshwater is only significant in the less acidic
segment of the stream. Neutralization of AMD entails a significant
decrease of the concentration of both total and soluble metals and As
and chemical speciation indicates that oxides, carbonates and sulfates
are the reactive phases. The Pb isotopic composition reveals that metals
derive from the Taxco ore deposit and that AMD is influenced by rocks of
the Morelos and Taxco Schist formations.
Filiaciones:
Quevedo-Castañón N.M.:
Doctorado en Ciencias Ambientales, Centro de Ciencias de Desarrollo Regional, Universidad Autónoma de Guerrero, privada de Laurel No. 13, Col. El Roble, Acapulco, Gro., C.P. 39640, Mexico
Talavera-Mendoza, Oscar:
Doctorado en Ciencias Ambientales, Centro de Ciencias de Desarrollo Regional, Universidad Autónoma de Guerrero, privada de Laurel No. 13, Col. El Roble, Acapulco, Gro., C.P. 39640, Mexico
Escuela Superior de Ciencias de la Tierra, Universidad Autónoma de Guerrero, Exhacienda San Juan Bautista s/n, Taxco el Viejo, Guerrero, 40323, Mexico
Salgado-Souto S.A.:
Escuela Superior de Ciencias de la Tierra, Universidad Autónoma de Guerrero, Exhacienda San Juan Bautista s/n, Taxco el Viejo, Guerrero, 40323, Mexico
Ruiz, Joaquin:
Department of Geosciences, University of Arizona, 1040 East 4th Street, Tucson, AZ 85721, United States
Dotor-Almazan, Azucena:
Instituto de Geofísica, Universidad Nacional Autónoma de México, Circuito de la Investigación s/n, C.U., Coyoacán, Mexico City, 04510, Mexico
Ramírez-Guzmán A.H.:
Escuela Superior de Ciencias de la Tierra, Universidad Autónoma de Guerrero, Exhacienda San Juan Bautista s/n, Taxco el Viejo, Guerrero, 40323, Mexico
Sampedro-Rosas, Laura:
Doctorado en Ciencias Ambientales, Centro de Ciencias de Desarrollo Regional, Universidad Autónoma de Guerrero, privada de Laurel No. 13, Col. El Roble, Acapulco, Gro., C.P. 39640, Mexico
Rosas-Acevedo J.L.:
Doctorado en Ciencias Ambientales, Centro de Ciencias de Desarrollo Regional, Universidad Autónoma de Guerrero, privada de Laurel No. 13, Col. El Roble, Acapulco, Gro., C.P. 39640, Mexico
Chávez-González J.D.:
CINVESTAV Campus Irapuato, Instituto Politécnico Nacional, Km. 9.6 Libramiento Norte Carr. Irapuato-León, Irapuato, Guanajuato, 36824, Mexico
Gold
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