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TitleNainlin Formation, a new Middle Cambrian map unit from the Mackenzie Mountains, Northwest Territories
AuthorMacNaughton, R BORCID logo; Fallas, K MORCID logo
SourceBulletin of Canadian Petroleum Geology vol. 62, no. 2, 2014 p. 37-67,
Alt SeriesEarth Sciences Sector, Contribution Series 20130384
Mediapaper; on-line; digital
File formatpdf; html
ProvinceNorthwest Territories; Yukon
NTS95M/09; 95M/10; 95M/11; 95M/12; 95M/13; 95M/14; 95M/15; 95M/16; 95N/09; 95N/10; 95N/11; 95N/12; 95N/13; 95N/14; 95N/15; 95N/16; 96C; 96D; 96E/01; 96E/02; 96E/03; 96E/04; 96E/05; 96E/06; 96E/07; 96E/08; 96E/10; 96E/11; 96E/12; 96E/13; 96E/14; 96E/15; 96F/01; 96F/02; 96F/03; 96F/04; 96F/05; 96F/06; 96F/07; 96F/08; 105O/09; 105O/10; 105O/11; 105O/12; 105O/13; 105O/14; 105O/15; 105O/16; 105P/09; 105P/10; 105P/11; 105P/12; 105P/13; 105P/14; 105P/15; 105P/16; 106A; 106B; 106G; 106H; 106I/01; 106I/02; 106I/03; 106I/04; 106J/01; 106J/02; 106J/03; 106J/04
AreaMackenzie Mountains; Franklin Mountains
Lat/Long WENS-132.0000 -124.0000 66.2500 63.5000
Subjectsstratigraphy; sedimentary rocks; sandstones; conglomerates; shales; siltstones; dolostones; evaporites; Nainlin Formation; Paleozoic; Cambrian
Illustrationslocation maps; photographs; stratigraphic columns; cross-sections
ProgramGEM: Geo-mapping for Energy and Minerals Mackenzie Delta and Corridor
Released2014 07 07
AbstractNainlin Formation (new) is proposed to unify two Middle Cambrian successions of "red beds" that crop out in the eastern Mackenzie Mountains, Northwest Territories. Strata east of Mackenzie Arch previously were treated as a proximal facies of the Saline River Formation whereas equivalent strata further west were included as a basal member within the Franklin Mountain Formation. Both successions are characterized by red-weathering siliciclastic facies that preserve evidence for deposition in shallow to marginal marine settings, commonly under restricted conditions. Whereas typical Saline River Formation is dominated by mudrocks and evaporites, Nainlin Formation is rich in quartzose sandstone, lacks evaporites, and locally preserves conglomerate, notably in sections studied along the east flank of Mackenzie Arch. Although Nainlin Formation locally contains dolostone, its siliciclastic-dominated character distinguishes it from the dolostone-dominated Franklin Mountain Formation. Nainlin Formation lies with angular unconformity upon Neoproterozoic and earlier Cambrian formations and is overlain conformably, generally gradationally, by Franklin Mountain Formation. It is in part age-equivalent to Hess River and Rockslide Formations, which lie to the west and south, but has not been mapped in continuity with them. The western limit of Nainlin Formation is a zero edge in the footwall of the Plateau Fault in NTS 106A; the formation extends from thence into the easternmost Mackenzie Mountains, where it passes laterally into Saline River Formation. Published age controls from underlying and overlying units constrain Nainlin Formation as no older than Delameran (early Middle Cambrian) and not younger than late Marjuman (late Middle Cambrian). Nainlin Formation generally is less than 100 m thick, although locally it can exceed 300 m in thickness. It is preserved in three outcrop belts separated by elongate paleohighs that apparently were "corrugations" on the broad crest of Mackenzie Arch. The eastern high is here dubbed "Sheep Lick high". Further west, paleohighs can be mapped in the footwall and hanging-wall of Plateau Fault; these are dubbed "Deadend high" and "Sayunei high", respectively. The paleohighs and intervening outcrop belts are oriented NW-SE, as is the facies transition from Nainlin Formation into Saline River Formation.
Summary(Plain Language Summary, not published)
This manuscript proposes that a new stratigraphic unit be formalized in the Mackenzie Mountains, Northwest Territories. Nainlin Formation (new) unites distinctive rock types inthe study region that previously were included in existing formations. However, these rocks have far more in common with each other than with the units in which they previously were included. Nainlin Formation consists of red-weathering sandstone and mudrocks with lesser conglomerate and carbonate. Mapped distribution of Nainlin Formation confirms previous ideas about the extent of Mackenzie Arch, a broad, elongate region that stood high during the Cambrian. It also demonstrates that the broad crest of Mackenzie Arch was corrugated and informal names are proposed for the elongate ridges that defined the corrugations (Sheeplick high, Deadend high, Sayunei high). Mackenzie Arch controlled distribution of rock types along the western margin of Mackenzie Plain oil and gas exploration region during the Cambrian.

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