Catodoluminiscencia (CL) acoplada a Microscopio electrónico de barrido (MEB): aplicación al estudio del contenido y distribución de lantánidos (REE) en fases fosfatadas naturales

• Autores: J.Á. Orgaz Díaz, Philippe Blanc, María Pilar Lapuente Mercadal, Luis Francisco Auqué Sanz, María José Gimeno Serrano, J. B. Gómez Jiménez, Juan Miguel A. Mandado Collado
• Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 6, 1, 2004 (Ejemplar dedicado a: IV Congreso Geológico de España (Zaragoza, 12-15 julio, 2004)), págs. 85-88
• Idioma: español
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• Resumen

  • Phosphatic minerals are common hosters for minor to trace amounts of Rare Earth Elements (REE).

    Cathodoluminiscence spectra from 200 to 900 nm are presented for natural carbonate-apatite present as micronodules in the Luesma Formation (Silurian - Devonian) of Iberian Chain (Spain). Spectra have been performed with a Cathodoluminiscence (CL) equipment coupled to a Scanning Electronic Microscope (SEM). This study is one of not many works focused on natural phosphates analysed by this combined technique. Composition of major elements has been characterized by SEM-EDAX (BSE) in micronodules with a result of calcium phosphate with Fe, AI and Si as minor elements. CL spectra result from the interplay of two factors: relative concentration of individual REE, and the presence of Mn as principal activator. One of the great problems of identifying REE in those materials is the peak overlapping of diverse elements.