Rejuvenation on Akpatok Island: A Topographical Unconformity in North-Eastern Canada

Cox, Ian

doi:10.1017/s0016756800091263

Cited by 6 publications

(4 citation statements)

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“…Sounding coverage in Ungava Bay at the time of the survey by Cox (1933b) was probably not sufficient to enable recognition of the submerged plateau in Ungava Bay with its surrounding escarpments. Cox's theory that faulting is responsible for the escarpments around Akpatok Island would imply, by extension, that the escarpments around the submerged plateau are also primarily due to faulting.…”

Section: Discussion Of Resultsmentioning

confidence: 99%

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Geophysical investigations in the Ungava Bay – Hudson Strait region of Northern Canada

Grant¹,

Manchester²

1970

Can. J. Earth Sci.

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Continuous seismic profiler surveys have defined the limits of the Paleozoic outlier in Ungava Bay, and indicate that similar rocks occur. to the north beneath Hudson Strait. These surveys have shown also that the strata underlying Hudson Strait are down-warped to form a synclinal structure with its axis parallel to the bathymetric trend of the Strait. Extrapolations based upon the dips and thicknesses indicated on the seismic profiler records and on physiographic evidence, suggest that the southwestern side of Hudson Strait has been down-faulted relative to the block of Paleozoic strata in Ungava Bay. These relationships postulated on the basis of seismic profiler results are supported by aeromagnetic, sea-magnetometer, and seagravimeter data from that region. A seismic and magnetic profile from Frobisher Bay indicates that a Paleozoic outlier occurs there as well. Although the submarine physiography of this region is primarily controlled by structure and secondarily modified by sub-aerial erosion, glacial erosion may account for local detail.

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Section: Discussion Of Resultsmentioning

confidence: 99%

“…I ) , is composed of flat-lying Ordovician limestone (Cox 1933a(Cox , b, c, 1936Wilson 1938). From topographic features shown on published bathymetric charts it may be inferred that a submarine extension of the Paleozoic rocks of Akpatok Island probably occupies much of central Ungava Bay.…”

Section: Introductionmentioning

confidence: 99%

Geophysical investigations in the Ungava Bay – Hudson Strait region of Northern Canada

Grant¹,

Manchester²

1970

Can. J. Earth Sci.

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“…Pres de la cbte ouest, plusieurs vallkes profondes existent, mais elles aboutissent toutes en cul-de-sac vers l'amont, apres souvent moins d'un km. Le plateau sur le reste de l'ile est peu disseque, les vallees qui s'y trouvent ayant des profils transversaux et longitudinaux relativement doux (Cox, 1933).…”

Section: Le Cadre Physique Topographieunclassified

“…Les strates sont sub-horizontales, peu Cpaisses et intensement diaclaskes. Quant a I'origine de lTle, Cox (1933) l'explique en termes d'un horst, ce qui rendrait compte des grandes profondeurs marines a proximite des falaises. Cette opinion n'est cependant pas partagee ni par Grant et Manchester (1970), ni par Workum et al (1976, qui considerent plutbt l'ile comme un lambeau residue1 associe a l'krosion, probablement subaerienne, de l'ancien couvert paleozoique du Bassin d 'Ungava.…”

Section: Gcologie Et Gbomorphologie Glaciaireunclassified

Drainage karstique en milieu de pergélisol: le cas de l'ǐle d'akpatok, T.N.O. Canada

Lauriol

Gray

1990

Permafrost & Periglacial

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L'ǐle étudiée, située au nord‐ouest de la baie d'Ungava, est formée de calcaires ordoviciens qui reposent en strates subhorizontales sur le socle archéen. Des observations sur le terrain et sur des photos‐aériennes ont révélé que le drainage souterrain est trés important, malgré le fait que la température moyenne annuelle d'environ −7 °C implique un pergélisol profond. L'eau issue de la fonte nivale printanière pénétre dans les fissures, et dans les dolines aux fonds des dépressions associèes aux lacs. Cette disparition des eaux de surface est plus rapide dans le secteur sud de l'ǐle, que dans le secteur nord. Une diminution de l'épaisseur du tapis nival vers le sud de l'ǐle est peutětre responsable en partie de ce contraste. Peu d'eau réapparait le long des falaises et au fond des vallées, ce qui laisse supposer la présence de sources sous‐marines. Des profils thermiques ont montré que le pergélisol est présent sur l'ǐle, mais qu'il est possiblement interrompu par des taliks associés aux pertes d'eaux verticales. Les analyses hydrochimiques ont fourni des résultats comparables à ceux des autres eaux des karsts arctiques: des duretès totales voisines de 100 mg/1 CaCo3. Un modèle de circulation d'eau souterraine en milieu de pergèlisol est proposé.

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Cephalopods and a Beatricea from Akpatok Island

Foerste¹,

Cox²

1936

Geol. Mag.

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SummaryThe cephalopods and stromatoporoid collected from Akpatok Island, Ungava Bay, N.W.T., in 1931, by Cox, are described by Foerste in this communication as follows:—Endoceras coxi sp. nov., Endoceras sp. (resembling E. coxi), Endoceras akpatokense Foerste, Endoceras two spp., Shamattawaceras cf. ascoceroides Foerste and Savage, Orthoceras ungavense Foerste, Spyroceras sp. (resembling S. balteatum (Bill.) in some respects), Spyroceras cf. aquilonare Troedsson), Spyroceras wordiei Foerste, Spyroceras two spp., Huronia septata Parks, Westonoceras sp., and Beatricea undulata Billings.Tentative correlations of the Akpatok limestones with other areas are drawn from this material. The greater part of the lime-stones appear to correlate with the Red River formation of Manitoba. The lowest horizons, containing Westonoceras, apparently correspond to part of the Nelson River formation of the Hudson Bay region; the intermediate horizon, with Shamattawaceras and Huronia, apparently to the Shamattawa formation of the same locality; while the horizon with Beatricea (650 feet above sea-level) is of Richmond age. The extent to which the remainder of the fauna, as yet identified, agrees with this is reviewed.

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Rejuvenation on Akpatok Island: A Topographical Unconformity in North-Eastern Canada

Abstract: In the summer of 1931 the Oxford University Hudson Straits Expedition spent five weeks on Akpatok Island, Ungava Bay, North-Eastern Canada. It was then that the writer made notes which result in the following communication.

Cited by 6 publications

References 1 publication

Geophysical investigations in the Ungava Bay – Hudson Strait region of Northern Canada

Geophysical investigations in the Ungava Bay – Hudson Strait region of Northern Canada

Drainage karstique en milieu de pergélisol: le cas de l'ǐle d'akpatok, T.N.O. Canada

Cephalopods and a Beatricea from Akpatok Island

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