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TitreA lithostratigraphic transect through the Cambro - Ordovician Franklin Mountain Formation in NTS 96D (Carcajou Canyon) and 96E (Norman Wells), Northwest Territories
AuteurTurner, E C
SourceCommission géologique du Canada, Dossier public 6994, 2011, 31 pages, (Accès ouvert)
ÉditeurRessources naturelles Canada
Documentdossier public
Medianumérique; en ligne
ProvinceTerritoires du Nord-Ouest
SNRC96D; 96E
Lat/Long OENS-128.0000 -126.0000 66.0000 64.0000
Sujetslithostratigraphie; stratigraphie systématique; analyses stratigraphiques; corrélations stratigraphiques; lithologie; hydrocarbures; capacité de production d'hydrocarbures; potentiel minier; caractéristiques structurales; interpretations structurelles; roches sédimentaires; paléogéographie; Formation de Franklin Mountain ; Formation de Mount Kindle ; stratigraphie; Paléozoïque; Ordovicien; Cambrien
Illustrationslocation maps; stratigraphic columns; stratigraphic sections; photographs; cross-sections
Bibliothèque de Ressources naturelles Canada - Ottawa (Sciences de la Terre)
ProgrammeCorridor et delta du Mackenzie, GEM : La géocartographie de l'énergie et des minéraux
Diffusé2011 12 14
Résumé(disponible en anglais seulement)
Lithostratigraphy of the Cambro-Ordovician Franklin Mountain Formation is presented for three platformal localities that form a transect perpendicular to depositional strike in NTS 96D and 96E. Previously established informal members are generally recognisable in these sections, but their contacts are ill-defined and their characteristics are not distinctive enough that they can always be identified, particularly where exposure is poor. There is a significant possibility of diachroneity or geographic variability in the development of several of the informal members, and of intraformational hiatuses. The formation was deposited under restricted conditions that limited fetch, wave-base, and biota. Storm-dominated conditions prevailed over a broad depositional area with little paleogeographic variation during accumulation of the lowermost part of the formation. Increasing restriction and differentiation into an inner, more restricted zone, a hinge zone with ooid shoals, and an outer, slightly deeper-water lagoonal area, developed during deposition of the middle and upper parts of the formation. Chert and green clay seams appear at approximately the same stratigraphic level in the upper part of the formation, and are associated with differences in diagenetic behaviour of nearby dolostones, strongly suggesting that the clays were mafic tuffs that contributed solutes (Si, Mg and Fe) to the enclosing sediment as they stabilised to clay. Field-based assessment of the diagenesis of the entirely dolomitic Franklin Mountain Formation suggests a simple post-depositional history that probably involved reflux dolomitisation either during deposition of the formation or during the hiatus that separated its deposition from that of the overlying Mount Kindle Formation. A better understanding of the Franklin Mountain Formation's depositional history east of the study area and of its lateral relationships to equivalent deep-water strata of the Misty Creek Embayment to the west and southwest would greatly enhance understanding of the region's tectonostratigraphic, paleoclimatic, and fluid-flow history.