Evaluación de la movilidad potencial de metales en escorias industriales presentes en el subsuelo de un entorno urbano (barrio de la Almozara, Zaragoza)

Pyrite roasting wastes coming from a former industry closed in 1979 are still present at the subsoil of La Almozara neighborhood (Zaragoza, Spain). These granular wastes are mainly composed of Fe- and Fe-Ti-oxides, also having high Tl, As, Mo, Cu, Sb, Ag, Pb, and Be content that far exceed the generic reference levels. When these waste materials interact with water, they produce acid solutions with pH=3,2, resulting in a high mobilization of Cu, Zn, Cd, Mn, and Co. However, when wastes are mixed with granular construction materials, leachates showed neutral pH and chemical mobilization was much lower being only significant for Se and Mo. The results here obtained demonstrate the potential risk for hydrogeological contamination posed by the presence of these wastes in the subsoil and the high eolic dispersability of such materials. El cierre en 1979 de la Industrial Química de Zaragoza dejó los residuos industriales de tostación de piritas en el subsuelo del actual barrio de La Almozara (Zaragoza). Estos residuos, de carácter granular y constituidos por óxidos de Fe y Fe-Ti, poseen elevadas concentraciones en Tl, As, Mo, Cu, Sb, Ag, Pb y Be, que superan ampliamente los niveles genéricos de referencia. La interacción de estos residuos con agua provoca soluciones con pH=3,2, dando lugar a una movilización elevada de Cu, Zn, Cd, Mn y Co. Sin embargo, cuando estos residuos están mezclados con material granular de construcción, las soluciones resultantes de la interacción mantienen un pH neutro y la movilización elemental es muy inferior, siendo solo relevante para Se y Mo. Los resultados obtenidos demuestran el potencial riesgo de contaminación del medio hidrogeológico que supone la presencia de las escorias en el subsuelo y su alta dispersabilidad eólica

Mapa de anomalía de Bouguer del Pirineo Suroccidental

Las relaciones geométricas y cinemáticas entre las unidades de basamento de los Pirineos Suroccidentales, específicamente entre la terminación de la Zona Axial y el afloramiento de los Macizos Vascos, son desconocidas y potencialmente muy complejas (Oliva-Urcia, 2018). La gravimetría se ha aplicado con éxito en otras regiones pirenaicas para resolver la geometría de las unidades de cobertera y basamento debido al contraste de densidad existente en las rocas involucradas. Con el objetivo de resolver dichas relaciones y sus implicaciones en la comprensión 4D de esta parte de la cadena, hemos llevado a cabo un exhaustivo programa de adquisición de datos gravimétricos (2018-2020) entre los valles de Salazar (al oeste) y del Aragón Subordán (hacia el este) en el marco del proyecto 3DGeoEU (GeoERA-H2020). Más de 1500 nuevas estaciones (varias de ellas en alta montaña) junto con > 1700 puntos de la base de datos SITOPO, ¿ 1200 de campañas mineras, y > 500 de anteriores proyectos del IGME hacen un total de > 5000 estaciones gravimétricas armonizadas. Además, se han recopilado > 500 datos de densidad de bases de datos o muestreados en el campo. En este trabajo presentaremos los mapas de anomalías Bouguer y de anomalía residual obtenidos, junto con una revisión de las principales estructuras cartográficas en la zona

Emplacement and deformation of mesozoic Gabbros of the High Atlas (Morocco): paleomagnetism and magnetic fabrics

A paleomagnetic and magnetic fabric study is performed in Upper Jurassic gabbros of the central High Atlas (Morocco). These gabbros were emplaced in the core of preexisting structures developed during the extensional stage and linked to basement faults. These structures were reactivated as anticlines during the Cenozoic compressional inversion. Gabbros from 19 out of the 33 sampled sites show a stable characteristic magnetization, carried by magnetite, which has been interpreted as a primary component. This component shows an important dispersion due to postemplacement tectonic movements. The absence of paleoposition markers in these igneous rocks precludes direct restorations. A novel approach analyzing the orientation of the primary magnetization is used here to restore the magmatic bodies and to understand the deformational history recorded by these rocks. Paleomagnetic vectors are distributed along small circles with horizontal axes, indicating horizontal axis rotations of the gabbro bodies. These rotations are higher when the ratio between shales and gabbros in the core of the anticlines increases. Due to the uncertainties inherent to this work (the igneous bodies recording strong rotations), interpretations must be qualitative. The magnetic fabric is carried by ferromagnetic (s.s.) minerals mimicking the magmatic fabric. Anisotropy of magnetic susceptibility (AMS) axes, using the rotation routine inferred from paleomagnetic results, result in more tightly clustered magnetic lineations, which also become horizontal and are considered in terms of magma flow trend during its emplacement: NW-SE (parallel to the general extensional direction) in the western sector and NE-SW (parallel to the main faults) in the easternmost structures

Nature, Origin, and Evolution of the Pyrenean‐Cantabrian Junction

International audienc

Emplacement and Deformation of Mesozoic Gabbros of the High Atlas (Morocco): Paleomagnetism and Magnetic Fabrics

A paleomagnetic and magnetic fabric study is performed in Upper Jurassic gabbros of the central High Atlas (Morocco). These gabbros were emplaced in the core of preexisting structures developed during the extensional stage and linked to basement faults. These structures were reactivated as anticlines during the Cenozoic compressional inversion. Gabbros from 19 out of the 33 sampled sites show a stable characteristic magnetization, carried by magnetite, which has been interpreted as a primary component. This component shows an important dispersion due to postemplacement tectonic movements. The absence of paleoposition markers in these igneous rocks precludes direct restorations. A novel approach analyzing the orientation of the primary magnetization is used here to restore the magmatic bodies and to understand the deformational history recorded by these rocks. Paleomagnetic vectors are distributed along small circles with horizontal axes, indicating horizontal axis rotations of the gabbro bodies. These rotations are higher when the ratio between shales and gabbros in the core of the anticlines increases. Due to the uncertainties inherent to this work (the igneous bodies recording strong rotations), interpretations must be qualitative. The magnetic fabric is carried by ferromagnetic (s.s.) minerals mimicking the magmatic fabric. Anisotropy of magnetic susceptibility (AMS) axes, using the rotation routine inferred from paleomagnetic results, result in more tightly clustered magnetic lineations, which also become horizontal and are considered in terms of magma flow trend during its emplacement: NW-SE (parallel to the general extensional direction) in the western sector and NE-SW (parallel to the main faults) in the easternmost structures