The rocks of the Tazin Lake region, north of Lake Athabasca, have been subdivided into three major complexes: the Northeastern basement complex, mainly composed of a syn-to-late tectonic granodiorite-diorite series ; a central meta-sedimentary and gneissic belt ; and the Western granodiorite complex. Mylonitization, folding, and faulting are common in the centrally located meta-sedimentary and gneissic belt. Twenty new radiometric age determinations by the K-Ar method on biotite and amphibole of the granodiorite-diorite series average 2370 + 40 m.y. Fragmentation of late tectonic basic dikes and remobilization of the granodiorite-diorite series have been provisionally correlated with this established minimum age. The Western granodiorite complex was intruded 1900 m.y. ago. One biotite sample from White Lake granite of the meta-sedimentary and gneissic belt indicates an apparent K-Ar age of 1800 m.y.
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