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Hadean mantle depletion and 3.95-Gyr subduction implied by North China rocks
Analysis of a 3.95-Gyr-old trondhjemitic gneiss from eastern Hebei, China, reveals a composition suggesting a low-temperature altered basaltic source, that originated from a mantle depleted in the Hadean, was most likely transported to mantle depths through a transient subduction event and partially melted to produce the trondhjemite.
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