Great Slave and Trout River map-areas, Northwest Territories, 85 S1/2 and 95 A, H

Douglas, R. J.

doi:10.4095/101212

Cited by 2 publications

(7 citation statements)

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“…The Alexandra Formation is tilted gently to the south‐west (Douglas, 1959), and a series of north‐east and north‐west‐trending post‐depositional normal faults (most offsets are < 15 m) bound the uplifted blocks that form the escarpment. Restoring the depositional profile for the formation must therefore consider (i) corrections for the regional structural tilt, (ii) corrections for fault displacements, (iii) depositional and erosional topographic variations on the formation base, and (iv) original depositional slopes on the platform.…”

Section: Study Area and Methodsmentioning

confidence: 99%

Sequence stratigraphy of a Late Devonian ramp‐situated reef system in the Western Canada Sedimentary Basin: dynamic responses to sea‐level change and regressive reef development

Macneil

Jones

2006

Sedimentology

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The Alexandra Formation, located in the Northwest Territories of Canada, is formed of a Late Devonian (Frasnian) reef system that developed on a gently sloping, epicontinental ramp in the Western Canada Sedimentary Basin. Highresolution sequence stratigraphic analysis of its deposits delineates two reef complexes that are separated by a Type I sequence boundary. The second reef complex developed on the outer ramp, basinward of the first, after sea-level fell 17 m. Stratigraphic complexity of the second reef complex was a result of its initiation during forced regression, and its development through an entire cycle of sea-level rise followed by sea-level fall. Its highstand systems tract was not characterized by high rates of carbonate production or sediment shedding. Rather, these features took place as sea-level fell, after its highstand systems tract. The sequence stratigraphic framework of this regressive reef system highlights a number of depositional parameters that differ from high-relief, shelf-situated reef systems with steep, narrow margins. These have implications for understanding the controls on the development of rampsituated reef systems, and the nature of reef systems with gently sloping profiles. This study demonstrates that the development of stromatoporoid reef systems may be far more complex than generally realized, and that highresolution sequence stratigraphy may provide the tools for better understanding of complex, often enigmatic, aspects of these systems.

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Section: Study Area and Methodsmentioning

confidence: 99%

Sequence stratigraphy of a Late Devonian ramp‐situated reef system in the Western Canada Sedimentary Basin: dynamic responses to sea‐level change and regressive reef development

Macneil

Jones

2006

Sedimentology

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“…Abbreviation: GSLSZ, Great Slave Lake Shear Zone. (Douglas, 1959;Belyea and Norris, 1962;Norris, 1965). Unconformably overlying the Mirage Point Formation are carbonate rocks of the Chinchaga Formation, which is lower Middle Devonian (Eifelian) in age (Norris, 1965).…”

Section: Regional Stratigraphymentioning

confidence: 99%

“…2). Douglas (1959) previously mapped this fault zone as a northwest-trending normal fault (northeast side down) in the Alexandra Member of the Twin Falls Formation, with a dis placement of approximately 9 m. The beds at McNallie falls have an approximate orientation of 150°/20°SW. The sense of displacement of smaller faults measured at this location by the authors is in agreement with previously mapped results.…”

Section: Domainmentioning

confidence: 99%

“…2). Bell Rock has been previously doc umented by Camsell (1917), Cameron (1922), Douglas (1959), and Norris (1965), among others. The outcrop is com posed of gypsum interbedded with shale of the Chinchaga Formation, in faulted contact with brecciated limestone.…”

Section: Domainmentioning

confidence: 99%

“…The outcrop is com posed of gypsum interbedded with shale of the Chinchaga Formation, in faulted contact with brecciated limestone. Douglas (1959) mapped the fault at approximately 020° with a near vertical dip. Individual slip planes measured by the authors yielded a mean of 021°/70°SE (n=5), which is in good agreement with previous mapping (Table 1; Fig.…”

Section: Domainmentioning

confidence: 99%

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Regional structural data from the Hay River area, Northwest Territories, with emphasis on the Pine Point mining camp

Turner¹,

Gal²

2003

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A regional study undertaken south of Great Slave Lake, Northwest Territories, focused on evaluating evidence for structural control on mineralization at Pine Point. Relatively consistent northeastsouthwest (055°) and northwest-southeast (125°, 140°, 150°, and 160-165°) joint sets were observed in the study area. A dominant east-west (085°) joint set was observed in one domain. The orientation of the 055° set is close to that of the Great Slave Lake Shear Zone (045° at Pine Point) and the Hay River Fault (055°; west side of study area). Previous studies conducted on ore-mineral paragenesis at Pine Point proved that hydrothermal dolomite occurred concurrently with the ore-deposition event. This study demonstrates that fracturing at Pine Point pits largely postdated dolomitization, and therefore ore deposition. Furthermore, no structural controls on mineralization were observed in the pits, and are therefore not considered a primary mechanism for ore emplacement in the Pine Point orebodies. Résumé : Une étude régionale entreprise au sud du Grand lac des Esclaves (Territoires du Nord-Ouest) visait principalement à évaluer les indices d'un contrôle structural sur la minéralisation à Pine Point. Dans la région à l'étude, on a observé des réseaux de diaclases orientés de manière relativement cohérente suivant des orientations nord-est-sud-ouest (055�) et nord-ouest-sud-est (125°, 140�, 150� et 160-165�). Un réseau dominant de diaclases d'orientation est-ouest (085�) a été observé dans un domaine. L'orientation du réseau à 055� se rapproche de celle de la zone de cisaillement du Grand lac des Esclaves (045� à Pine Point) et de celle de la faille de Hay River (055�; dans l'ouest de la région à l'étude). Les études antérieures sur la paragenèse du minerai à Pine Point ont démontré que la dolomite hydrothermale s'est formée au cours de l'épisode minéralisateur. La présente étude révèle que la fracturation dans les fosses de la mine Pine Point est survenue bien après la dolomitisation et, par conséquent, après la minéralisation. En outre, aucun contrôle structural sur la minéralisation n'a été observé dans les fosses de la mine; il ne s'agirait donc pas d'un mécanisme de mise en place primaire du minerai dans les amas minéralisés de Pine Point.

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Great Slave and Trout River map-areas, Northwest Territories, 85 S1/2 and 95 A, H

Cited by 2 publications

References 0 publications

Sequence stratigraphy of a Late Devonian ramp‐situated reef system in the Western Canada Sedimentary Basin: dynamic responses to sea‐level change and regressive reef development

Sequence stratigraphy of a Late Devonian ramp‐situated reef system in the Western Canada Sedimentary Basin: dynamic responses to sea‐level change and regressive reef development

Regional structural data from the Hay River area, Northwest Territories, with emphasis on the Pine Point mining camp

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