RT Journal Article
T1 Isotope geochemistry of waters affected by mining activities in Sierra Minera and Portman Bay (SE, Spain)
A1 García Lorenzo, María De La Luz
A1 Martínez Sánchez, María José
A1 Pérez Sirvent, Carmen
A1 Agudo, Inés
A1 Recio, Clemente
AB The objective of this work was to evaluate processes affecting waters from Portman Bay by way of stable isotopic analysis, particularly H and O stable isotopes from water and S and O from dissolved sulfates. In addition, surface waters from Sierra Minera were examined for the purpose of determining if these waters are affected by similar processes. The results obtained indicate that Portman Bay waters are meteoric, and marine infiltration only takes place in the deepest layers near the shore or if water remains stagnated in sediments with low permeability. The main source of sulfate was the oxidation of sulfides, resulting in the liberation of acid, sulfate and metals. In order to assess the mechanism responsible for sulfide oxidation, the stoichiometric isotope balance model and the general isotope balance model were tested, suggesting that the oxidation via Fe3+ was predominant in the surface, and controlled by Acidithiobacillus ferrooxidans, while at depth, sulfate reduction occurred.
PB Elsevier
SN 0883-2927
YR 2014
FD 2014-12
LK https://hdl.handle.net/20.500.14352/34268
UL https://hdl.handle.net/20.500.14352/34268
LA eng
DS Docta Complutense
RD 2 oct 2024