A natural analogue of high pH cement pore waters from the Maqarin area of northern Jordan. II: results of predictive geochemical calculations

Rock alteration in alkaline cement waters over 15 years and its relevance to the geological disposal of nuclear waste

“…Modelling has also been used to predict the chemical and physical evolution within the CDZ (e.g. Savage et al, 1992;Savage and Rochelle, 1993;Braney et al, 1993;Bateman et al, 1999;Pfingsten et al, 2006;Soler and Mäder, 2007;Fernandez et al, 2010;Alexander et al, 1992). These studies generally support the experimental findings that silicate mineral dissolution is followed by secondary solid phase (e.g.…”

Stability of Clay Barriers Under Chemical Perturbations

“…In any case the reported mineralogical modifications (dolomite neoformation and leaching of Chl and Kaol occur) are limited to few centimeters. One of the most famous analogs regarding clay mineral concrete interaction is the Maqarin analog in the north of Jordan (Khoury et al, 1985;Alexander et al, 1992;Khoury et al, 1992). In this area, hyperalkaline groundwater is the product of low-temperature leaching of an assemblage of natural cement minerals produced as a result of high-temperature/low-pressure metamorphism of marls (i.e., clay biomicrites) and limestones.…”

Barreras de ingeniería para el aislamiento de residuos radiactivos

“…Un caso particularmente interesante de análogo natural que presenta condiciones hiperalcalinas comparables a las generadas por la barrera de hormigón en un repositorio, debido a ciertas anomalías geoquímicas, se estudió en el área de Maqarin, al norte de Jordania (20). Las aguas subterráneas hiperalcalinas encontradas en la zona son debidas a la combustión espontánea de sulfuros e hidrocarburos inflamables en presencia de carbonatos y arcillas en condiciones de alta temperatura y baja presión.…”