Caracterización de minerales de uranio con espectroscopía de
reflectancia de laboratorio: estudio del yacimiento de fósiles de Córcoles, Guadalajara
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Authors
Cruz, Juncal A.
Coronado Vila, Ismael
Ferrer Juliá, Montserrat
García Meléndez, Eduardo
Colmenero Hidalgo, Elena
Fernández Martínez, Esperanza
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Sociedad Geológica de España
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Abstract
En la naturaleza, el ion uranilo se asocia comúnmente a arseniatos, fosfatos y vanadatos; uno de los orígenes secundarios más frecuentes del uranio está asociado a fosfatos cálcicos biogénicos. En este estudio se han caracterizado minerales de uranio con espectroscopia de reflectancia VNIR-SWIR de laboratorio (400-2500 nm).
Entre las muestras estudiadas se han incluido los minerales secundarios de uranio: metatorbernita, metautunita y metauranocircita, así como fosfatos cálcicos (biogénicos e inorgánicos) y fósiles coexistentes con mineralizaciones de metatyuyamunita encontrados
en el yacimiento de vertebrados del Mioceno inferior de Córcoles
(Cuenca del Tajo, Guadalajara, España). Este yacimiento representa un ejemplo de la formación de minerales secundarios de uranio de tipo fosfatos. Su origen es el resultado de la interacción de los fósiles con aguas subterráneas u otros fluidos mineralizadores portadores
de uranilo (UO2 2+) durante la diagénesis. Los minerales con uranilo muestran rasgos de absorción a 1100, 1330 y 1672 nm atribuidos a los aniones uranilo. Dada la escasa información preexistente, la caracterización de los minerales que contienen uranio aporta valiosa información con gran potencial para ser aplicada en teledetección. Los datos obtenidos pueden ser de utilidad en la exploración, caracterización y/o protección de los yacimientos de uranio.
Uranyl ion is commonly associated with arsenates, phosphates and vanadates; one of the most frequent secondary origins of uranium is associated with biogenic calcium phosphates (bones and teeth) in nature. In this study different uranium minerals have been characterized with laboratory VNIR-SWIR reflectance spectroscopy (400-2500 nm). The samples studied included the secondary uranium minerals: metatorbernite, metautunite and metauranocyrcite. Calcium phosphates (biogenic and inorganic) and fossil remains coexisting with metatyuyamunite mineralization found in the Lower Miocene fossil vertebrate deposit of Córcoles (Tajo Basin, Guadalajara, Spain) have also been studied. This deposit represents a remarkable example of the formation of secondary uranium minerals of the phosphate type. Its origin is the result of the interaction of fossils with groundwater or other uranyl (UO2 2+) bearing mineralizing fluids during diagenesis. The uranyl-bearing minerals show absorption features at 1100, 1330 and 1672 nm attributed to uranyl anions. The characterization of uranium-bearing minerals provides valuable information with great potential for application in remote sensing, given the scarcity of pre-existing information. The obtained data can be useful in the exploration, characterization and/or protection of uranium deposits.
Uranyl ion is commonly associated with arsenates, phosphates and vanadates; one of the most frequent secondary origins of uranium is associated with biogenic calcium phosphates (bones and teeth) in nature. In this study different uranium minerals have been characterized with laboratory VNIR-SWIR reflectance spectroscopy (400-2500 nm). The samples studied included the secondary uranium minerals: metatorbernite, metautunite and metauranocyrcite. Calcium phosphates (biogenic and inorganic) and fossil remains coexisting with metatyuyamunite mineralization found in the Lower Miocene fossil vertebrate deposit of Córcoles (Tajo Basin, Guadalajara, Spain) have also been studied. This deposit represents a remarkable example of the formation of secondary uranium minerals of the phosphate type. Its origin is the result of the interaction of fossils with groundwater or other uranyl (UO2 2+) bearing mineralizing fluids during diagenesis. The uranyl-bearing minerals show absorption features at 1100, 1330 and 1672 nm attributed to uranyl anions. The characterization of uranium-bearing minerals provides valuable information with great potential for application in remote sensing, given the scarcity of pre-existing information. The obtained data can be useful in the exploration, characterization and/or protection of uranium deposits.