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Espectro de edad de 40 años de la Formación KBS Tuff, Koobi Fora
Nature
|February 17, 2018
Resumen
La datación de argón-argon (Ar-Ar) del tufo KBS en Kenia proporciona una edad precisa de 1.88 millones de años. Esto resuelve las discrepancias de fechas anteriores para este importante lecho geológico.
Área de la Ciencia:
- Geocronología
- Estratigrafía volcánica
- Paleoantropología
Sus antecedentes:
- El KBS Tuff es un lecho marcador crítico en la Formación Koobi Fora, Kenia, vital para la datación de los primeros sitios de homínidos.
- Estudios geocronológicos anteriores utilizando métodos Ar-Ar y K-Ar arrojaron fechas contradictorias para el Tufo KBS.
Objetivo del estudio:
- Para resolver los datos contradictorios de edad para el KBS Tuff.
- Para establecer una edad precisa y confiable para este marcador geológico clave.
Principales métodos:
- Análisis de los espectros de edad de Argon-40/Argon-39 (Ar-40/Ar-39).
- Análisis de fenocristales de anortoclase de tres clastos de piedra pómez dentro del Tufo KBS.
Principales resultados:
- Se obtuvieron patrones de espectros de edad de Ar-40/Ar-39 planos casi ideales, lo que indica una perturbación mínima después de la cristalización.
- Se determinaron edades concordantes de 1,88 ± 0,02 millones de años para el Tufo KBS.
- Los nuevos datos de Ar-40/Ar-39 confirman la edad del KBS Tuff y resuelven conflictos de fechas anteriores.
Conclusiones:
- El KBS Tuff ahora está muy bien datado en 1.88 ± 0.02 millones de años.
- Esta datación precisa mejora el marco cronológico para la Formación Koobi Fora y la investigación paleoantropológica en la región.
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