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El ciclo de los isótopos terrestres del uranio es el ciclo del isótopo terrestre del uranio.

Morten B Andersen1, Tim Elliott2, Heye Freymuth2

  • 11] Bristol Isotope Group, School of Earth Sciences, University of Bristol, Bristol BS8 1RJ, UK [2] Institute of Geochemistry and Petrology, Department of Earth Sciences, ETH Zürich, 8092 Zürich, Switzerland.

Nature
|January 17, 2015
PubMed
Resumen
Este resumen es generado por máquina.

El uranio reciclado de la superficie de la Tierra, alterado por un océano oxigenado, tiene distintas firmas isotópicas. Este uranio contamina el manto superior, influyendo en los basaltos de la cordillera oceánica media, pero no en los basaltos de las islas oceánicas, lo que indica fuentes más antiguas del manto.

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Área de la Ciencia:

  • La geoquímica es la geoquímica.
  • Geoquímica de isótopos La geoquímica de isótopos es la química de los isótopos.
  • Ciencias de la Tierra Ciencias de la Tierra Ciencias de la Tierra

Sus antecedentes:

  • Las condiciones de la superficie de la Tierra tienen un impacto significativo en su composición interior.
  • La distribución del uranio proporciona información sobre la historia temprana de la Tierra y los procesos del manto.
  • El aumento del oxígeno atmosférico influyó en la movilidad y el transporte del uranio.

Objetivo del estudio:

  • Para investigar las características isotópicas del ciclo global del uranio.
  • Para entender el impacto del uranio subducido en la composición del manto.
  • Para diferenciar entre las fuentes del manto utilizando isótopos de uranio.

Principales métodos:

  • Análisis de las composiciones isotópicas del uranio ((238) U / ((235) U ratios).
  • Examen de los basaltos de la cordillera oceánica media (MORB) y los basaltos de las islas oceánicas (OIB).
  • Comparación de los datos isotópicos con las edades de los modelos de plomo existentes para los OIB.

Principales resultados:

  • El uranio subducido exhibe altas proporciones (238) U / 235) U debido a la alteración óxica del océano.
  • Los MORB muestran proporciones elevadas (238) U / 235) U, lo que indica la contaminación del manto superior por uranio reciclado.
  • Los OIB no muestran composiciones isotópicas de uranio distintas en comparación con la Tierra, lo que sugiere fuentes más antiguas del manto.

Conclusiones:

  • El uranio reciclado ha alterado mediblemente el manto superior en los últimos 600 millones de años.
  • La sistemática de isótopos de uranio en las OIB apoya la formación de reservas en el manto hace entre 2.400 y 1.800 millones de años.
  • La distintiva firma isotópica del uranio reciclado destaca su importante papel en los ciclos geoquímicos globales.