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Volcanismo de dos mil millones de años en la Luna desde los basaltos de Chang'e-5

Qiu-Li Li¹, Qin Zhou², Yu Liu¹

¹State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China.

|October 19, 2021

Resumen

Los basaltos lunares más jóvenes datan de hace 2.03 mil millones de años por la misión Chang'e-5, extendiendo el volcanismo. Esta datación radiométrica precisa calibra los recuentos de cráteres y revela una fuente de manto pobre en KREEP para los basaltos lunares.

Área de la Ciencia:

Geología y geoquímica lunares
Ciencias planetarias
Datamiento radiométrico

Sus antecedentes:

La historia magmática y térmica lunar difiere de los planetas terrestres.
La mayoría del magmatismo basáltico lunar cesó hace 2.800 millones de años (Ga).
Las estimaciones anteriores de la edad de los basaltos más jóvenes se basaron en una cronología de recuento de cráteres incierta.

Objetivo del estudio:

Para fechar con precisión los clastos de basalto devueltos por la misión Chang'e-5.
Para determinar la diferenciación y las características de origen de estos jóvenes basaltos lunares.
Para extender la duración conocida del vulcanismo lunar y calibrar las cronologías.

Principales métodos:

Datamiento radiométrico plomo-plomo (Pb-Pb) de los clastos de basalto.
Determinación de las relaciones de isótopos uranio-plomo (U-Pb), incluido el valor μ.
Comparación de los datos isotópicos con los conjuntos de datos de basalto lunar existentes.

Principales resultados:

Una edad de cristalización precisa de hace 2.030 ± 4 millones de años para los basaltos de Chang'e-5.
Esto representa la edad radiométrica más joven para los basaltos lunares, extendiendo el vulcanismo en 800-900 millones de años.
La fuente de basalto tenía un valor μ bajo (aprox. 680), lo que indica una composición pobre en KREEP.

Conclusiones:

El vulcanismo lunar persistió mucho más tarde de lo establecido anteriormente por la datación radiométrica.
La edad precisa proporciona un punto de calibración crucial para las cronologías de conteo de cráteres en el sistema solar interior.
Los hallazgos ofrecen nuevos conocimientos sobre la evolución volcánica y térmica de la Luna, destacando una fuente pobre en KREEP para estos basaltos en etapa tardía.

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