Person: Iglesias Martínez, Mario
Loading...
First Name
Mario
Last Name
Iglesias Martínez
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Geológicas
Department
Mineralogía y Petrología
Area
Cristalografía y Mineralogía
Identifiers
5 results
Search Results
Now showing 1 - 5 of 5
Item Morphological and compositional characterization of gold contained in ferricretes of a weathered profile (Minvoul greenstone belt, Gabon)(Macla, 2018) Iglesias Martínez, Mario; Ordóñez Casado, Berta; Berrezueta, Edgar; Pérez Garrido, CarlosThis study presents the quantification and morphological characterization of particles and nuggets of almost pure gold found in the iron duricrust of a weathering profile of the Archean greenstone belt of Minvoul (Republic of Gabon). The weathered profile on the area (Figure 1) was defined through pits and trenches and consists, from bottom to top, on saprolite, mottled clay zone, iron duricrust, pisolitic gravels and yellow latosol. The iron duricrust constitutes a hard continuous layer, which is concretionary and pisolitic and consists of cemented nodules of goethite, hematite and other iron oxides and hydroxides. Samples from this horizon contain abundant particles of gold. The study of morphology and microchemical composition of gold grains has been widely used as a tool for the understanding of the dissolution, dispersion and gold concentration processes in supergene environments, and for determining the primary or secondary origin of gold grains across the lateritic horizons (Webster and Mann, 1984; Butt and Hough, 2006). Moreover, the results obtained represent a contribution for the knowledge of the gold-potential of the Ntem complex greenstone belts where mineralization on bedrock remains unknown.- Project number: 196
Item Material audiovisual para el mural "El Tiempo en Geología" de la Facultad de Ciencias Geológicas(2020) García Lorenzo, María De La Luz; Arroyo Rey, Xabier; Soutullo García, Belén; Abati Gómez, Jacobo; Benito Moreno, María Isabel; Álvarez Sierra, María De Los Ángeles; Arribas Mocoroa, José; Arribas Mocoroa, María Eugenia; Castiñeiras García, Pedro; Crespo Feo, María Elena; Fernández Barrenechea, José María; García Romero, Emilia; Granja Bruña, José Luis; Iglesias Martínez, Mario; De Ignacio San José, Cristina; Martín Chivelet, Javier; Muñoz Martín, Alfonso; Orejana García, David; Ortega Menor, Lorena; Pieren Pidal, Agustín Pedro; Piña García, Rubén; Fernández Martín, Elena; Fernández Suffo, Paula; Muñoz Gallego, AlmudenaLa Geología abarca toda la historia del planeta, por lo que se hace inviable utilizar conceptos temporales de nuestra vida cotidiana. Por ello, se ha realizado un friso para el hall de la Facultad y para presentarlo, se ha realizado un vídeo explicativo del mismo. Item Evaluación del riesgo ecotoxicológico en suelos afectados por actividades mineras en la Faja Pirítica mediante aplicación de bioensayos(Macla, 2022) Andreu Sánchez, Óscar; Esbrí Víctor, José María; García Lorenzo, María De La Luz; Arroyo Rey, Xabier; Iglesias Martínez, Mario; Crespo Feo, María Elena; Castiñeiras García, Pedro; Sánchez Donoso, Ramón; Ruiz Costa, NuriaItem Soil and Freshwater Bioassays to Assess Ecotoxicological Impact on Soils Affected by Mining Activities in the Iberian Pyrite Belt(Toxics, 2022) Andreu Sánchez, Óscar; García Lorenzo, María De La Luz; Esbrí Víctor, José María; Sánchez Donoso, Ramón; Iglesias Martínez, Mario; Arroyo Rey, Xabier; Crespo Feo, María Elena; Ruiz Costa, Nuria; Roca Pérez, Luis; Castiñeiras García, PedroThis study aims to use geochemical, mineralogical, ecotoxicological and biological indicators for a comprehensive assessment of the ecological risks related to the mobility, ecotoxicity and bioavailability of potentially harmful elements in the Lousal mining district. Particularly, toxicity was evaluated using four assays: algae, cytotoxicity assays with HaCaT cell line (dermal), earthworms and Daphnia magna. The geochemical and mineralogical characterization of the studied area shows that the mine wastes underwent intense weathering processes, producing important contamination of the adjacent soils, which also led to the release and mobilization of PHEs into nearby water courses. Total PTE results indicate that the soils affected by mining activities were highly contaminated with As and Cu, while Zn and Pb content ranged from low to very high, depending on the analyzed samples. Cadmium levels were found to be very low in most of the soil samples. The test using Daphnia magna was the most sensitive bioassay, while the Eisenia foetida test was the least sensitive. Except for the LOS07 soil sample, the rest of the soils were classified as “High acute toxicity” and “Very high acute toxicity” for aquatic systems. The results in HACaT cells showed results similar to the ecotoxicological bioassays. The application of biotests, together with geochemical and mineralogical characterization, is a very useful tool to establish the degree of contamination and the environmental risk of potentially harmful elements.- Project number: 200
Item El Distrito Minero más importante de Europa, la Faja Pirítica (SO Península Ibérica): nueva colección de muestras y nuevas herramientas para la docencia práctica en Recursos Minerales(2022) Piña García, Rubén; Yesares Ortiz, María Dolores; Ortega Menor, Lorena; Luque Del Villar, Francisco Javier; Iglesias Martínez, Mario