El papel del CO2 en la formación de depósitos de oro
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1CSIRO Division of Exploration and Mining, PO Box 3, Central Park, Victoria 3145, Australia. neil.phillips@csiro.au
Nature
|June 25, 2004
Resumen
El dióxido de carbono (CO2) juega un papel crítico en el transporte de oro en el transporte de oro.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- Geología económica Geología económica.
- Depósitos Minerales Los depósitos minerales se encuentran en los depósitos minerales.
Sus antecedentes:
- La producción mundial de oro a menudo se origina en depósitos que carecen de concentraciones significativas de metales básicos.
- Se cree que estos depósitos "solo de oro" se forman a partir de fluidos hidrotermales ricos en dióxido de carbono (CO2).
- El papel preciso del CO2 en el transporte de oro dentro de estos sistemas ha sido históricamente subestimado.
Objetivo del estudio:
- Investigar el papel del dióxido de carbono (CO2) en la formación y el transporte de oro en depósitos "sólo oro".
- Reevaluar la importancia del papel indirecto del CO2 como amortiguador del pH en los fluidos hidrotermales que contienen oro.
- Proponer un modelo revisado para los mecanismos de transporte de oro en entornos geológicos específicos.
Principales métodos:
- Análisis de datos geoquímicos y estudios de inclusión de fluidos para inferir las condiciones pasadas de fluidos hidrotermales.
- Modelado geoquímico para simular el comportamiento del oro, el azufre y el CO2 en condiciones variables.
- Reevaluación de los valores de pH calculados previamente para los fluidos transportadores de oro.
Principales resultados:
- Los valores de pH previamente inferidos para los fluidos que contienen oro pueden no representar con precisión las condiciones durante el transporte de oro.
- El dióxido de carbono (CO2) probablemente actúa como un amortiguador crucial del pH, manteniendo las condiciones específicas del fluido.
- Estas condiciones amortiguadoras facilitan concentraciones elevadas de oro a través de la complejidad con especies de azufre reducidas.
Conclusiones:
- El CO2 juega un papel crítico e indirecto en el transporte del oro al amortiguar el pH del fluido hidrotermal.
- Este mecanismo de amortiguación permite la complejación del oro con azufre reducido, lo que lleva a concentraciones más altas.
- Los hallazgos ofrecen un nuevo marco geoquímico para explorar depósitos "solo de oro".
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