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Two leucogranite plutons in the Sharbot Lake domain, dated at 1070 and 1066 Ma, are altogether younger than other plutons already dated in the same area; both are coeval with the 1065 Ma Guenette granite in the northern Central metasedimentary belt in Quebec. These two granite plutons, among others, were previously assigned to an alaskitic suite dated 1250–1240 Ma. A review of granite pluton ages in the Central metasedimentary belt shows that lithological similarity alone cannot be used for assigning such rocks to specific age groups. In addition, the two dated plutons are chemically distinct from each other and also from syenitic plutons of the Skootamatta suite (1090–1075 Ma), in the same general region. Geochemically dissimilar plutons thus need not have different ages. However, a consideration of characteristics such as relationship to regional structure allows the prediction that certain other granite plutons may belong to the young age group. Resume : Deux plutons leucogranitiques du domaine de Sharbot Lake, dates a 1070 et 1066 Ma, sont plus recents que les autres plutons deja dates dans la meme zone. Ils sont tous les deux contemporains du granite de Guenette de 1065 Ma dans le nord de la ceinture metasedimentaire centrale au Quebec. Ces deux plutons granitiques, entre autres, avaient ete attribues a une suite alaskitique datee a 1250–1240 Ma. Il ressort d’une analyse des âges des plutons granitiques dans la ceinture metasedimentaire centrale que l’on ne peut pas utiliser que la seule similarite lithologique pour repartir ces roches dans des groupes d’âge specifiques. De plus, les deux plutons dates se distinguent non seulement l’un de l’autre par leur composition chimique, mais egalement des plutons syenitiques de la suite de Skootamatta (1090–1075 Ma) qui se rencontre dans la meme grande region. Les plutons dont la composition geochimique differe ne sont pas necessairement d’âge different. Cependant, si l’on tient compte de certaines caracteristiques, comme le lien qui existe entre eux et la structure regionale, on peut presumer que certains autres plutons granitiques appartiennent au groupe d’âge jeune.

Late Grenvillian granite plutons in the Central metasedimentary belt, Grenville Province, southeastern Ontario; Radiogenic age and isotopic studies: Report 13