Datación de carbonatos por el método de U/Th: ejemplos en España
DOI:
https://doi.org/10.17735/cyg.v36i3-4.94555Palabras clave:
Cuaternario; series de uranio; datación radiométrica; 230Th/234U; espeleotemas; corales; calcretas; moluscosResumen
El método de U/Th permite datar materiales diversos de hasta 600.000 años de antigüedad. En este trabajo se revisan sus fundamentos y las técnicas analíticas disponibles, centrándose en su aplicación más habitual, que es la datación de carbonatos. En concreto, se discuten su potencial y limitaciones en la datación de espeleotemas, travertinos, calcretas, cementos, corales y moluscos aprovechando los ejemplos publicados en España.
El cálculo de edades mediante U/Th se basa en la serie de desintegración del 238U e involucra medidas de 238U, 234U y 230Th. Su fundamento radica en el fraccionamiento entre los radionucleidos del uranio y del torio en los sistemas naturales. En el caso de la precipitación de carbonato puro, éste incorpora uranio en el momento de su formación, pero está libre de torio inicial de tal forma que, pasado un tiempo, todo el 230Th medido en la muestra deriva de la desintegración del 234U y esta relación permite calcular la edad de formación del mineral. Teóricamente, por tanto, el carbonato a datar: (1) debe incorporar cierta cantidad de uranio en el momento de su formación, (2) no debe incorporar cantidad significativa de torio y (3) debe comportarse como un sistema cerrado. De estas premisas, la segunda y la tercera no siempre se cumplen por lo que el método se ha adaptado a estos casos añadiendo cálculos y correcciones adicionales.
Dada la variedad de carbonatos susceptibles de ser datados, este método es de amplia aplicación en paleoclimatología, paleontología, arqueología, estratigrafía, geomorfología, tectónica y oceanografía, entre otras disciplinas.
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