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In the Thirty Mile Lake area of the Baker Lake Basin, lithofacies assemblages representing alluvial fan, graveland sand-bed braided stream, lacustrine, and ephemeral lacustrine depositional environments characterize the lower part of the ca. 1.83 Ga Baker Lake Group. Five depositional sequences that unconformably overlie Archean basement are identified from this interval. These depositional sequences record the following accommodation cycles: initial base-level drop, subsequent base-level rise, increase in gradient as accommodation increased, decrease in gradient as accommodation space filled, and continued base-level rise. Sequences stack in a retrogradational pattern indicating that, for the interval recorded, accommodation space creation exceeded sediment flux and the basin was underfilled. Subsidence probably was due mainly to normal faulting on the southern margin of the basin. Alkalic volcanism occurred throughout the early depositional history of the Baker Lake Basin. 1 Contribution to the Western Churchill NATMAP Project 1 Resume : Dans la region du lac Thirty Mile du bassin de Baker Lake, des assemblages de lithofacies representant des milieux de depot de cones alluviaux, de cours d’eau anastomoses a lit de gravier et de sable, de lacs et de lacs ephemeres caracterisent la partie inferieure du Groupe de Baker Lake (1,83 Ga). On peut y reconnaitre cinq sequences sedimentaires qui reposent en discordance sur le socle archeen. Ces sequences sedimentaires refletent les cycles suivants : d’abord baisse du niveau de base, puis remontee du niveau de base, augmentation du gradient conjuguee a l’augmentation de l’accommodation, diminution du gradient lors du remplissage et remontee du niveau de base. Les sequences sont empilees dans une configuration de regression, ce qui suggere que pour l’intervalle conserve, la creation d’espace par accommodation a depasse l’influx de sediments et le bassin n’a pas ete rempli. La subsidence a probablement ete causee principalement par fracturation normale sur la marge sud du bassin. Il y a eu volcanisme alcalin pendant toute la periode initiale de l’histoire sedimentaire du bassin de Baker Lake.

Sequence stratigraphy and sedimentology of the Paleoproterozoic Baker Lake Group in the Baker Lake Basin, Thirty Mile Lake, Nunavut