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TitreGSC bedrock mapping and stratigraphic studies of the Colville Hills, Northwest Territories
AuteurFallas, K M; MacNaughton, R B; MacLean, B C
Source43rd Annual Yellowknife Geoscience Forum - Abstracts; par Irwin, D; Normandeau, P X; Gervais, S D; 2015.
Année2015
Séries alt.Secteur des sciences de la Terre, Contribution externe 20150411
ÉditeurNorthwest Territories Geological Survey
Documentlivre
Lang.anglais
Mediapapier; en ligne; numérique
Formatspdf
ProvinceTerritoires du Nord-Ouest
SNRC96K; 96L; 96M; 96N
Lat/Long OENS-128.0000 -124.0000 68.0000 66.0000
Sujetsexploration pétrolière; biostratigraphie; Formation de Franklin Mountain ; Formation de Mount Kindle ; Groupe de Delorme ; Arche de Keele ; stratigraphie; Crétacé
ProgrammeBouclier à Selwyn du corridor de Mackenzie, GEM2 : La géocartographie de l'énergie et des minéraux
Résumé(disponible en anglais seulement)
As a contribution to the Mackenzie Project of the Geological Survey of Canada's Geo-mapping for Energy and Minerals Program, bedrock mapping and stratigraphic studies of the Colville Hills petroleum exploration area was undertaken in July and August of 2015. Outcrops were examined for stratigraphic and structural relationships within NTS map areas 96K, 96L, 96M, and 96N. Known petroleum seeps within the area were also visited to examine their geological setting and collect samples. The aim of this work was to improve existing geological maps of the area, clarify the stratigraphic history of the region, refine the structural relationships in conjunction with available public-domain reflection-seismic data, and relate these features to the petroleum system. To improve upon reconnaissance-scale mapping by the Geological Survey of Canada in 1968, some effort was made to subdivide the Franklin Mountain and Mount Kindle formations, address lithologic variations in the Bear Rock interval ' including identifying strata possibly belonging to the Delorme Group ' and resolve the Cretaceous succession. It is hoped that samples collected for biostratigraphy will be able to confirm initial impressions from field observations. These initial impressions suggest that each of these unconformity bounded intervals is variably preserved across the study area, providing indications of different periods of deposition versus uplift and erosion related in part to the Keele Arch. Published maps based on the 1968 reconnaissance work interpreted the region's prominent topographic ridges to be underlain by elongate anticlines. Recent reflection-seismic data interpretations suggest the presence of thrust faults and/or steeper reverse faults associated with the major structures and 2015 field work has locally confirmed these relationships at surface. Efforts to subdivide stratigraphic units have also revealed additional faults in the southern part of the study area, at the northern edge of the Franklin Mountains. Tilting of Cretaceous strata on the flanks of major structures suggests that the formation of surface structures in the Colville Hills was later than the Early Cretaceous, likely as part of the development of the adjacent Franklin Mountains and Mackenzie Mountains. The Colville Hills differ, however, in that the orientation of the major structures is more variable and generally at high-angle to Cordilleran structural trends. Based on reflection-seismic evidence, this may be the result of reactivation of older normal or reverse faults in the subsurface. Petroleum seeps visited in 2015 were noted to occur in close proximity to interpreted steeply-dipping faults. Since the Devonian source-rock, the Canol Formation, is known to be absent in the Colville Hills, it is suspected that the petroleum may have migrated to surface from Cambrian Mount Clark or Mount Cap strata along the mapped faults. Samples collected in 2015 will be geochemically fingerprinted to compare with known regional petroleum sources to test this hypothesis.
Résumé(Résumé en langage clair et simple, non publié)
Ce document est le résumé d'un exposé présenté au Forum géoscientifique de Yellowknife en novembre 2015. La conférence porte sur les résultats du travail de terrain effectué en 2015 par la CGC dans les collines Colville dans le cadre du projet Mackenzie du programme Géocartographie de l'énergie et des minéraux (GEM). L'objectif de ce travail de terrain était d'établir la cartographie du substratum rocheux, les relations stratigraphiques, les caractéristiques structurelles et le système pétrolier. Les résultats déclarés comprennent des améliorations apportées à la corrélation et à la répartition des unités stratigraphiques et des révisions apportées aux types et au nombre de structures de plis et de failles. Les échantillons prélevés pour l'étude des fossiles devraient aider à confirmer l'âge et la corrélation des unités stratigraphiques, et des échantillons de pétrole ont été recueillis à des lieux de suintement pour établir la correspondance géochimique avec les sources connues de pétrole dans la région.
GEOSCAN ID297533