...J. K. Park Abstract A paleomagnetic study was conducted on a regionally extensive diabase sill intruding the upper part of the Helikian (?) Tsezotene Formation located in the Mackenzie Mountains Supergroup of northwestern Canada. Twelve sites, one from a lower sill at one locality, were sampled...

... the base of the Windermere Supergroup. Rb–Sr isochron dates of 766 ± 24 and 769 ± 27 Ma have been obtained for two of the these diabase sheets, which intruded the Tsezotene Formation of the Mackenzie Mountains Supergroup. The emplacement of the diabase sills and dikes may be related to either of two...

... to the dominantly clastic Late Proterozoic Tsezotene Formation and Katherine Group of the Mackenzie Mountains Supergroup. Tests of Carey's orocline hypothesis for the arc using linear regression and a plan-view application of the fold test suggest, in line with earlier structural studies, that the arc is largely...

..., whose probable primary pole lies at the beginning of the sequence, near the younger end of the Grenville Track (0.88 Ga). The end of the apparent polar wander (APW) sequence may be defined by a primary pole from sills intruding the Tsezotene Formation below the Katherine. We relate the sills, dated...

... maps ( Blusson 1972 ; Gabrielse et al. 1972 a , 1972 b , 1973 ; Aitken 1974 ; Aitken et al. 1974 ; Aitken and Cook 1979 a , 1979 b ; Norris 1982 a , 1982 b ). Thickness data for the Tsezotene Formation and isopach maps for the Katherine Group ( Fig. 3 ) support the contention...

...Figure 6. Probability density diagrams and histograms for detrital zircon samples from Tsezotene Formation and Katherine Group sandstones of the Mackenzie basin. Age ranges of potential source regions are highlighted with colored bars. 207 Pb/ 206 Pb ages are plotted on x -axis only...

... the subsur- face distribution of the four lowest formations of the 'Mackenzie Mountains upergroup' (Fig. 2) in the area of interest (Fig. 1). In downward succession, they are Kather- ine Group, Tsezotene Formation, Map-unit H1 (of Aitken et a l . , 1982) and sub-H1 beds. The Katherine consists of grey...

...Table 4. Ar – Ar data for detrital muscovites from the Tsezotene Formation of the Mackenzie Mountains Supergroup (sample DT-95-11-1B; J f = 0.01944 ± 0.00019; Z4539; 64.8466°N, 133.1149°E). Laser power a Volume 39 Ar (×10 –11  cm 3 ) %Atm. 40 Ar...

... ), the regionally extensive 18–60-m-thick Concajou Canyon sill is exposed over a distance of ∼200 km ( Park, 1981 ). The sill intrudes the upper part of the Proterozoic Tsezotene Formation of the Mackenzie Mountains Supergroup and is part of a regionally extensive suite of mafic rocks that intrudes the sedimentary...

... of the Precambrian Little Dal Group, Mackenzie Mountains, Northwest Territories, Canada . Can. J. Earth Sci. 21 , 371 – 375 . Park , J.K. , Aitken , J.D. , 1986 . Paleomagnetism of the late Proterozoic Tsezotene Formation of northwest Canada . J. Geophys. Res. 91 , 4955 – 4970 . Park...

... variability in the tilts permitted a fold test to be robustly conducted. Additionally, true polar wander (TPW) or large plate motions may have been averaged in the mean formation poles, as the virtual geomagnetic poles (VGPs) from the uppermost member (Walcott Member) were 30° away from the underlying VGPs...

... ). It is not clear if this thinning is due to stratigraphic or structural truncation. The contact between the Kikiktat volcanics and the underlying siliciclastic strata of the Neruokpuk Formation (sensu Robinson et al., 1989 ), or O.G. map unit ( Macdonald et al., 2009 ), is generally structural, although at some...