The ca. 2680 Ma Raquette Lake Formation and correlative units across the Slave Province, Northwest Territories: evidence for a craton-scale overlap sequence

The geology and lithostratigraphy of the Raquette Lake Formation on the southeastern flank of the Sleepy Dragon Complex, Yellowknife Domain, are described. Twenty-seven sections across apparent stratigraphy have been measured and laterally correlated, and form the basis for a somewhat broadened definition of the Raquette Lake Formation and the correlative Detour Lake Formation. Both formations are included in a new group, the Ross Lake Group, the introduction of which better reflects currently known lithostratigraphic and chronostratigraphic relationships in the area. The Raquette Lake Formation unconformably overlies the Cameron River Basalt formation and the partly unroofed, synvolcanic Ross Lake Granodiorite. The sub-Raquette Lake unconformity is correlated with the third of four temporally distinct unconformities in the Point Lake area, 280 km to the north. Furthermore, similar lithostratigraphic units are described from west to east across the Slave Province suggesting existence of a ca. 2690–2680 Ma marker horizon that overlaps a putative basement suture. 2001-C7 W. Bleeker 1 CURRENT RESEARCH RECHERCHES EN COURS 2001 Article Article Titles Titres Purchase Information Information pour acheter