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This chapter summarizes information on the northernmost parts of the Shield relevant to the understanding of the early history of the Innuitian region; a systematic description of the Canadian Shield and Greenland can be found in another volume of this series (Hoffman et al., in prep.). From a stratigraphic point of view, the Shield is divisible into crystalline basement, metamorphosed in Archean and/or Early Proterozoic time, and unconformably overlying sedimentary and volcanic successions of Proterozoic age that are only slightly deformed.

The following section describes briefly the crystalline basement rocks at the margin of the Arctic Platform, proceeding from southwest to northeast. Regional metamorphic facies of the Canadian part have been compiled by Fraser et al. (1978).

Victoria Island. Granodiorite on the northeast side of the Minto Arch yielded a’ K-Ar age of 2391 ± 125 Ma (recalculated from Lowdon et al., 1963), suggesting that it may be part of the original Slave Province. This interpretation is supported by the inferred Early Proterozoic age of unconformably overlying sediments (Campbell, 1981; see below). A later thermal event, however, is apparent from the 1645 ± 20 Ma K-Ar age on a pegmatitic granite in the Wellington High (W.A. Gibbins, quoted by Campbell and Cecile, 1979).

Boothia Peninsula, Somerset Island and Prince of Wales Island. The Precambrian core of the Boothia Uplift (Fig. 4.2, 4.3) consists of quartzofeldspathic, pelitic, calcareous, and mafic rocks metamorphosed largely in the transitional granulite facies (Blackadar, 1967; Brown et al., 1969). Structural trends are northerly on

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