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Las edades del diamante sublitosférico y el ciclo del supercontinente
Suzette Timmerman1,2, Thomas Stachel3, Janne M Koornneef4
1Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta, Canada. suzette.timmerman@geo.unibe.ch.
Nature
|October 18, 2023
Resumen
Los diamantes sublitosféricos revelan antiguos procesos de subducción bajo el supercontinente Gondwana. Estos diamantes se formaron hace 450-650 millones de años, proporcionando información sobre la estabilidad del supercontinente y la dinámica profunda de la Tierra.
Área de la Ciencia:
- Geoquímica
- Petrología
- Tectónica
Sus antecedentes:
- El papel de la subducción en los ciclos supercontinentales es difícil de estudiar debido a las limitadas muestras del manto.
- Los diamantes sublitosféricos proporcionan una visión única de los procesos profundos de la Tierra y la evolución de los supercontinentes.
Objetivo del estudio:
- Para usar diamantes sublitosféricos para restringir el tiempo y la naturaleza de la subducción relacionada con el antiguo ciclo del supercontinente.
- Para investigar la preservación a largo plazo y la acumulación de diamantes dentro de la litosfera.
Principales métodos:
- Análisis de cuatro sistemas de isótopos (Rb-Sr, Sm-Nd, U-Pb, Re-Os) en las inclusiones dentro de los diamantes sublitosféricos.
- Geobarometría con inclusiones de mayorías.
- Análisis de elementos traza y relación isotópica de las inclusiones de Fe-sulfuro y CaSiO3.
Principales resultados:
- Cristalización superpuesta de hace 450-650 millones de años para los diamantes de Juína y Kankan.
- Los datos isotópicos y de oligoelementos indican la formación de un sistema de subducción peri-Gondwanan.
- Los diamantes se mantuvieron en la quilla litosférica durante más de 300 millones de años, lo que sugiere un mecanismo para el crecimiento de la litosfera y la estabilidad del supercontinente.
Conclusiones:
- Los diamantes sublitosféricos proporcionan un registro directo de los procesos del manto profundo vinculados al montaje del supercontinente.
- La acumulación a largo plazo de diamantes en la litosfera puede haber mejorado la estabilidad del supercontinente.
- Este estudio refina nuestra comprensión del ciclo supercontinental y las interacciones profundas del manto terrestre.
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