Abstract

Estimates of the Rb-Sr whole-rock age of the Kanuku Complex of southern Guyana vary between 2020 and 2180 m.y. The lower number agrees with the Rb-Sr whole-rock age (2018 to 2037 m.y.) of the associated Makarapan Granite, a field correlative of the Kanuku. The range of age estimates falls within the range of the Akawaian Episode (2000 to 2100 m.y.) which involved the Kanuku Complex. The Encrucijada Granite (2110 m.y.) of Venezuela can be correlated with this episode.

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