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La evidencia de renio-osmio para la mineralización regional en el suroeste de América del Norte
Science (New York, N.Y.)
|September 3, 1993
Resumen
La datación por renio-osmio de la molibdenita revela dos intervalos distintos de mineralización del metal porfiro durante la orogenia laramida. Estos eventos generalizados y sincrónicos sugieren interacciones regionales entre la corteza y el manto, no procesos localizados.
Área de la Ciencia:
- Geología económica Geología económica.
- Geocronología Geocronología.
- La tectónica es la tectónica.
Sus antecedentes:
- La orogenia Laramide en el suroeste de América del Norte (90-50 Ma) está vinculada a más de 40 depósitos de porfiro de metales básicos.
- La molibdenita, un sulfuro rico en renio, es un mineral común en estos depósitos de mineral.
Objetivo del estudio:
- Para fechar con precisión los eventos de mineralización asociados con los depósitos de cobre del pórfido de Laramide.
- Para investigar la distribución temporal y espacial de la mineralización.
- Comprender los procesos geológicos subyacentes que impulsan la formación de mineral.
Principales métodos:
- La geocronología del isótopo de renio-osmio (Re-Os) se aplicó a muestras de molibdenita de varios depósitos.
- El mapeo geológico y el análisis de la edad del sótano se utilizaron para contextualizar el tiempo de mineralización.
Principales resultados:
- La mineralización en depósitos individuales consistentemente se produjo tarde en la actividad magmática, independientemente de la duración o intensidad magmática.
- La datación por renio-osmio identificó dos intervalos principales de mineralización: 74-70 Ma y 60-55 Ma.
- Los depósitos más antiguos se encuentran principalmente en el sótano precambriano del noroeste de Arizona; los depósitos más jóvenes se encuentran en el sur de Arizona y en el sótano precambriano del norte de México.
Conclusiones:
- La mineralización sincrónica y generalizada en entornos geológicos distintos apunta a interacciones entre la corteza y el manto a escala regional.
- Los hallazgos desafían la noción de que estos depósitos de mineral se formaron a partir de procesos magmáticos localizados.
- Los dos grupos de edad distintos sugieren eventos metalogénicos pulsados durante la orogenia de Laramide.
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