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Efecto de la presión sobre la fraccionamiento de isótopos de hidrógeno entre la brucita y el agua a temperaturas

Horita¹, Driesner, Cole

¹Chemical and Analytical Sciences Division, Oak Ridge National Laboratory, Post Office Box 2008, MS 6110, Oak Ridge, TN 37831-6110, USA.

Science (New York, N.Y.)

|November 24, 1999

Resumen

La alta presión tiene un impacto significativo en la fraccionamiento del isótopo deuterio-protio entre la brucita y el agua a altas temperaturas. Este efecto de presión en la partición de isótopos es crucial para interpretar los fluidos geológicos y los datos de paleotemperatura.

Área de la Ciencia:

La geoquímica es la geoquímica.
Física mineral Física de los minerales
La geoquímica de los isótopos es la geoquímica de los isótopos.

Sus antecedentes:

La fraccionamiento isotópico es sensible a las condiciones ambientales.
Comprender los efectos de la presión es vital para interpretar los sistemas geológicos.

Objetivo del estudio:

Determinar experimentalmente el efecto de la presión sobre la fraccionamiento de deuterio-protio entre brucita y agua a 380°C.
Para comparar los resultados experimentales con las predicciones teóricas.

Principales métodos:

Medición experimental de la fraccionamiento de deuterio y proteo.
Presión variable de 15 a 800 MPa a una temperatura constante de 380°C.
Análisis de la relación entre el factor de fraccionamiento y la densidad del agua.

Principales resultados:

La fraccionamiento de deuterio-protio de equilibrio aumenta en 12,4 por mil con el aumento de la presión.
Se observó una correlación lineal entre el factor de fraccionamiento y la densidad del agua.
La tendencia experimental coincide con los estudios teóricos, pero con una magnitud menor.

Conclusiones:

La presión influye significativamente en la partición isotópica en el sistema brucita-agua a temperaturas elevadas.
El efecto de presión isotópica observado requiere consideración en las interpretaciones de paleotemperatura y fuentes de fluidos.
Los datos experimentales proporcionan una comprensión más refinada de los cambios isotópicos inducidos por la presión en contextos geológicos.

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